Ffmpeg vmaf score. Nov 10, 2019 · "model_path=vmaf_v0.

Ffmpeg vmaf score mp4 -lavfi "[0]null[refdei Oct 11, 2023 · How to use ffmpeg to get vmaf quality score. Full VMAF score calculation, distorted file vs reference file. VMAF doesn’t cut it for true perceptual transparency with the out of the box models. Again, I'm not applying any filters including black bar cropping to intentionally game the scores. Which means VMAF scores tell you almost nothing about the quality of these specific encodes. This post showcases how CUDA-accelerated VMAF (VMAF-CUDA) enables VMAF scores to be calculated on NVIDIA GPUs. It varies by codec implementation. /ffmpeg-6. (its not the color range problem that ffmetrics have. May 19, 2021 · I am trying to calculate the VMAF score of a processed video wrt the original file. If you're like me, you find the functionality of VMAF very useful but very time consuming and confusing to use at first. com Mon May 9 19:19:01 EEST 2022. org/VMAF Master: https://github. According to the VMAF log you posted, you're currently getting a score of almost 98, which is very high. mkv-m vmaf--vmaf-features cambi:heatmaps_path = /tmp/cambi Examples. Fix some edge cases where crf-search would succeed exceeding the specified --max-encoded-percent . VMAF image feature extractors are ported to CUDA, enabling it to consume images that are decoded using the NVIDIA Video Codec SDK. Previous message (by thread): [FFmpeg-user] Disparity in VMAF scores Next message (by thread): [FFmpeg-user] Disparity in VMAF scores Messages sorted by: Jan 8, 2017 · vmaf_score. 8676. I would like to use libvmaf, but libvmaf always computes the vmaf score in parallel. Also note pyschovisual settings will improve perceived quality while lowering a vmaf test. 863779 VMAF score: 89. txt – path and name of the file to contain scores-report – saves the log file (not essential)-f null - – Tells FFmpeg to output a null file. Correct, when you specify a model using a version, it takes it from the list of built-in models. This string will then be substituted with a value from the list of values from pipelineVariables. 1 published; added a phone model libvmaf published; VMAF supported by FFmpeg Speed optimization; added a 4K model; added confidence interval First public showing at ICIP VMAF-enabled video optimization Sep 21, 2021 · The Max column identifies the highest score for each data rate. ffmpeg -i distorted. So supports what my eyes thought vid. 044922. Score is the 4k file from YT against the 4k DNxHR master. Obtain the VMAF (Video Multi-Method Assessment Fusion) score between two input videos. mp4 -filter_complex "[0:v][0:a][1:v][1:a]vmaf=print=vmaf_score:scorefile=frame_scores. I found some interesting outcomes which contradicted some of what the community had told me, and I wanted to ask you all a few questions about it. mp4. when i use the 1080p standard model, i get 98. However, having a json log generated by ffmpeg in the same run, it also gave the following results at the end of the log file: May 13, 2018 · static void compute_vmaf_score (LIBVMAFContext * Generated on Sun May 13 2018 02:04:21 for FFmpeg by Mar 12, 2024 · VMAF-CUDA in FFmpeg executes on the GPU asynchronously relative to the CPU, freeing it up to do additional tasks. mp4 -i processed. Along with these three common scoring systems, there are others as well like SSIMULACRA 2 and Butteraugli. @mengxuewei you won't be able to compare videos of different frame rates together since VMAF performs frame by frame comparisons. The VIF scores refer to Visual Information Fidelity but I don't know what the scale numbers mean there. Hi. I can use it to calculate the VMAF scores of a distorted video against a reference video using commands like this: ffmpeg -i distorted. When the filter is applied, it analyzes each frame of the video and generates a report of quality metrics such as the VMAF score, PSNR (Peak Signal-to-Noise Ratio) score, and MS-SSIM (Multi-Scale Structural Similarity Index Measure) score. 4, while not even vmaf 100 guarantees visual transparency. Input format of the kernel is YUV. This problem was reported in the vmaf github (examples, Netflix/vmaf#611 and Netflix/vmaf#629), so vmaf developers updated their documentation to address this issue. mp4 -i original. (Questions above table) Nov 21, 2022 · I tried to calculate the VMAF score with ffmpeg and get totally extreme different scores! The mp4 file get around 51 points and the mkv file around 76 1-pass encoding generally results in a higher VMAF score (~0. 7007000000000001 psnr: 48. 1 Oct 25, 2018 · An example VMAF-bitrate relationship for the default model and the phone model is shown above. A) YT Bitrate. Oct 23, 2020 · I will note one use for frame-threads=1 though -- stability. By definition, the 5 th percentile gives us a VMAF score of the worst 5% frames while the 50 th percentile is the median. txt file which contains the JSON output of one of the tests that I conducted. txt If you search for "vmaf":0, you see will that . g mp4) to it and it automatically resizes to the appropriate resolution, converts to raw format and computes the VMAF score for each frame. It's strange i always got a score of zero. json) is trained to predict the quality of videos displayed on a 1080p HDTV in a living-room-like environment. If you don't want to convert the video and want to know the corresponding CRF value to the preferred VMAF value, use ab-av1 crf-search --input i. I used ffmpeg, at subsample 200. I have command like below Dec 7, 2023 · VMAF is now included as a filter in FFmpeg, and can be configured using: . VMAF Dockerfile generates a docker image from the Python library. When running the two pngs through VMAF in ffmpeg, they report a score of 98, which is what I actually expect and is obviously not 0. mp4 This command takes the same input videos as before, but instead of calculating According to "ffmpeg. Ffmpeg can compute the VMAF of an encode. yuv test_25M. av1. I averaged these scores in the below table. exe on those files to double check and the scores came back in the upper mid 90s, which made much more sense. ts (actually, in practise it takes into account several frames) and a subsample of reference. I then tried the same with libsvtav1 and got pretty much same results. Macro Definition Documentation. mkv using mkvmerge (Sintel_x264_2pass_5000_1_mkvmerge in folder above), ffmpeg shows right results, so the question is - it is a bug of Hi @myselfzhangji,. If the point is to compare other Nvidia GPU's, then yes, sticking with ffmpeg is probably best. XP During comparison, I scale the original video to the upscale resolution using bicubic using FFMPEG as follow: Feb 6, 2022 · This produces a VMAF score of 96. There is no PSNR that is printed out. For reference, I'm running the comparison with duplicated sources and expect a score of 100%. Now I need to find vmaf score. Understood. brew tap homebrew-ffmpeg/ffmpeg. mp4 is very similar to the h264 vid. Nov 10, 2019 · "model_path=vmaf_v0. Here are the most relevant ones (IMHO) Aug 28, 2018 · But for some videos, I got a vmaf score of zero. VMAF is a codec-independent objective metric of comparable quality between source and output, using USC & Netflix's (and others) algorithm, which attempts to produce a model-based metric that is superior to other obje Dec 7, 2020 · How does VMAF NEG mode work? To make the long story short: we can detect the magnitude of the VMAF gain coming from image enhancement, and subtract this effect from the measurement. Orange is VMAF score, left scale Results. The default VMAF model (model/vmaf_v0. The VMAF score will be using the model we've chosen to provides us a score, so what it's actually telling us will change a bit depending on the model. The top rung of your ladder should be the lowest data rate that achieves a VMAF score of between 93-95. A good way to think about a VMAF score is to linearly map it to the human opinion scale under which condition the training scores are obtained. Install ffmpeg, but with libvmaf Nov 3, 2020 · This is the video file that we've compressed/modified, and we're looking to score this file against the reference file (1). You can find all the libvmaf options here. Aug 11, 2023 · I'm using ffmpeg 6. Source code(tar. While I am able to get just the VMAF score by . Copy link I also took the time to calculate the VMAF, PSNR, and SSIM scores for each of my 13 compressed files. - chuntangwang/vmaf-with-ffmpeg Aug 28, 2017 · Hi @ecomte, configure file is there inside FFmpeg/ so if you want to run vmaf using FFmpeg first install libvmaf library using make install and then from the root directory of FFmpeg (which is FFmpeg/) do . It’s a great and powerful metric but the models it comes with are designed to help you deliver high quality OTT streaming. There are two metrics we measured with VMAF-CUDA: VMAF per frame latency: The time required to compute the three feature extractors to obtain a VMAF score for a single frame reflecting responsiveness. It seeks to reflect the viewer’s perception of the streaming quality. Can you please advise how can i do that using filters on decoded streams in ffmpeg, automatedly. The algorithm of the scaler is the same as the bicubic scaling in ffmpeg. Can you please advise how can i do that using filters on decoded streams in ffmpeg. mkv using mkvmerge (Sintel_x264_2pass_5000_1_mkvmerge in folder above), ffmpeg shows right results, so the question is - it is a bug of Jan 12, 2018 · Calculate VMAF Motion score. Jun 22, 2020 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Nov 1, 2023 · In FFmpeg, libvmaf is implemented as a filter that can be applied to a video stream. VARIABLENAME. Generated on Fri Jan 12 2018 01:48:22 for FFmpeg by Apr 11, 2021 · Interpreting VMAF Scores: VMAF scores range from 0 to 100, with 0 indicating the lowest quality, and 100 the highest. May 28, 2020 · The link you provided is just to install the VMAF python library. However, NVencC has --vmaf as a direct command line so you can get VMAF score at the end of the encode, it's pretty neat. 7 h265. 0 Computing VMAF Utilizing FFmpeg, Error: Filter libvmaf has an unconnected output Apr 12, 2019 · I cut a sequence from 00:00:30 to 00:00:34 from Tears of Steel 1080p using ffmpeg Here are the ffmpeg 2-pass settings for x264 - VMAF score 72. from ffmpeg_quality_metrics import FfmpegQualityMetrics as ffqm a=ffqm("E Aug 7, 2020 · This reverses out techniques like “sharpening, contrasting, histogram equalization, among others, could boost VMAF scores. VQM The Video Quality Metric was validated in the Video Quality Experts Group (VQEG) and is a good full-reference algorithm. Its First VMAF running in prod @ Netflix Started collaboration with UT Austin VMAF went live on Github; first VMAF techblog published VMAF 0. I've tried FFmpeg and handbrake using - x264, x265, NVENC, with various CRF settings and 2 pass. You can get other models from Netflix VMAF project. Since VMAF scores align better with humans, VMAF is typically considered better than SSIM or PSNR for scoring video compression. After hearing about VMAF I wanted to see the score between the original file and the file encoded with DVDfab. 922567" on my CLi in the end. The hardware used for this measurement was a 56C/112T Dual Intel Xeon 8480 compute node and a single NVIDIA L4 GPU. 4x speedup in throughput in the open-source tool FFmpeg and up to 37x lower Hi, all I am pretty new to using FFmpeg and use DVDFab to encode my films. Jan 8, 2017 · 12 * FFmpeg is distributed in the hope that it will be useful, 13 572 err = vmaf_score_pooled(s->vmaf, s->model, pool_method_map(s->pool), 573 Jul 5, 2018 · I still prefer using Netflix’s VMAF metric, particularly for assessing the quality of files in an encoding ladder. i fixed that. The intuition here is that instead of weighing all frames equally and Nov 9, 2018 · Like most quality metrics, VMAF produces a single score per frame, and most tools that I’ve seen average the scores for the individual frames into a single overall score. VMAF is a perceptual video quality assessment algorithm developed by Netflix. exe -h encoder=h264_amf" the default is "speed" but while that's faster than quality, the VMAF scores are only 2~3% different. 1]: vmafossexec. Evaluation. The use case is a twitch-like streaming service where videos are eligible to be played on demand `compute_vmaf()` is deprecated, so that cant load feature extractors to calcurate vmaf scores. Jul 17, 2020 · I've noticed that when using libvmfaf with FFmpeg,some frames have a VMAF score of 0. json ``` The previus command line takes a synchronisation window sw of 2 seconds , this means that the sync lookup will be done between the first frame of distorted-A. Your score of 94. However I read that to ensure right vmaf score, it is important that both source and encoded videos are in frame sync. In addition, the VMAF delta between the SSIM tuned and untuned clip was much higher than with x265, though not as significant as x264. . This article shows that worst frame VMAF improves considerably with preset 7 and lower so it's worth keeping that in mind as well since I didn't log worst case VMAF values in my testing. 40 and 99. txt" -map 0:a:0 -map 1:a:0 -c:a copy output. 1. 644028 > > > Command used: > > ffmpeg -i crowd_run_1080p50. 60, significantly outperforming the other two codecs. The beauty of VMAF lies in its ability to model human perception. You will have to test a little and decide what a good VMAF is for you, then you can try different quality levels under various encoders until you get to that VMAF. Jul 6, 2020 · I have one source video and encoder version of that source. Apr 17, 2020 · So, tuning for PSNR doesn’t appear to work. The green box is the cell identified via conditional formatting as equalling the Max score which is the highest VMAF score at that resolution. 8 and 74. I think this can be closed. Run PSNR, SSIM, VMAF and VIF at the same time: ffmpeg-quality-metrics dist. json' whatever that means, and the 4k variant. I know it isn't a hardware issue as it doesn't even take up 15% of the CPU when running and I have a bunch of other stuff open. For PSNR, the community consensus is that for 1080p encodes, a score of 45 or above is good. All the subjective data were collected in such a way that the distorted videos (with native resolutions of 1080p, 720p, 480p etc. I have command like below May 13, 2018 · vmaf_score pthread_t vmaf_thread pthread_mutex_t lock pthread_cond_t cond int eof AVFrame * gmain AVFrame * gref int frame_set char * model_path char * log_path char * log_fmt int disable_clip int disable_avx int enable_transform int phone_model int psnr int ssim int ms_ssim char * pool int error I found the following with SVT-AV1 1. Running ffmpeg with x265 output on Ubuntu, the first system with more than 4 cores/threads I used (Ryzen with 4C/8T) ffmpeg ran great but if you ran several copies of ffmpeg, or loaded the system down when ffmpeg was running, you'd get a ~1-5% or so failure rate, it'd segfault at some address in x265 mid-encode, rerun the same file A graphical user interface (GUI) tool for computing VMAF (Video Multi-Method Assessment Fusion) scores between a reference and distorted video. We provide a few examples how you can construct the FFmpeg command line and use VMAF as a filter. mp4 -c:v libx264 -an -b:v 500k -filter:v scale=720:-1 -preset placebo -pa Reducing the file size by half (or more!) and getting a VMAF score of 93+ is stunning. The preset argument lets you change the encoder preset (range 0-13 Netflix still uses a combination of VMAF and PSNR to evaluate encode settings. Jan 1, 2023 · Fix some cases where ffmpeg progress & VMAF score output parsing failed. But I seem to have lower standards than a lot of people on this sub. Even comparing mathematically identical content can sometimes give you vmaf scores as low as around 97. 6. VMAF is a tool developed by Netflix to grade the quality of a compressed video file in comparison to the Original. By incorporating elements of human perception into its algorithm, VMAF provides a more accurate and comprehensive measure of video quality, one that aligns more closely with how humans perceive quality. the score differences between different encoder parameter values, but if you are interested in absolute scores, it may be better to use the 4K model file which predicts the subjective quality of video displayed on a 4K screen Mar 5, 2024 · ffmpeg-quality-metrics dist. When I was running VMAF, I assumed that the "upscaled" version is the "reference/source" and the "original file" as "distorted" version, since VMAF score can't go over 100. 8 . Looking at the two pngs, they seem identical to the eye. I have checked the frames of the two videos, didn't find any significant difference. The most common models are already included in archive. 265 compression settings and was using vmaf through the command line to automate the process of grading my encoding settings, but I found vmaf typically difficult and time consuming to use. de Sep 8, 2022 · I have an ffmpeg version built with VMAF library. t-nil opened this issue Nov 25, 2023 · 0 comments Comments. png" to just get a sample of the frame that VMAF has ranked at 0. Features can also be enabled individually without fusing (e. c. To build VMAF on Windows, follow these instructions. It can be interpreted that the same distorted video would be perceived as having a higher quality when viewed on a phone screen than on a HD TV, and that the VMAF score differences between the 720p and 1080p videos are smaller using the phone model. More on this below. My problem is that when I run the command to get the VMAF score, it is taking nearly the runtime of the video. pkl – path to VMAF model (this is the default model):log_path=VMAF. 168431 > > > > I just don't Dec 31, 2023 · But, when I encoded the same video in CRF 23 and libx264, preset medium, aac audio, I got VMAF score of around 96! The libx265 ffmpeg encoding settings say that CRF of 28 for libx265 should be same of CRF=23 of libx264, but I am getting very low VMAF scores, at CRF=28, ffmpeg. Installation instructions, as well as how to add FFmpeg and FFprobe to your PATH, can be found here. Balanced lands between the two with fps close to speed but quality closer to "quality" mode. The VMAF uses only luminance samples. Encoding speed is % of real time. However, VMAF is only available through the commandline or as an extension to FFMPEG. if I want to compute a ms_ssim score, I can use the libvmaf like so ffmpeg -i output. To my great surprise rav1e is slower than aomenc, but the quality is much higher. before i got 86 score on the source This score, known as the VMAF score, ranges from 0 to 100, with higher scores indicating better quality. 50 when the -preset is set to slow and veryslow, while 55% of svtav1’s VMAF scores fall between 99. 2 gig resulting file return 96. The encodes ranged from 1/3 the size of the original to 2. gz) Oct 30, 2020 · how to sync frames while calculating vmaf score using ffmpeg. I then test a encode at a desired crf (with no extra options) to see how high a crf I can go before hitting say 93 vmaf. adm2, vif_scalex scores range from 0 (worst) to 1 (best) motion2 score typically ranges from 0 (static) to 20 (high-motion) Jul 6, 2020 · I have one source video and encoder version of that source. In my experience, VMAF scores tend to match my own subjective quality observations and the fact that Netflix uses it gives the metric great credibility. 8 times the original but get scores only ranged from 72. For the best practices of computing VMAF at the right resolution, refer to our tech blog. I have attached a . 7. The first input is the distorted video, and the second input is the reference video. IE: Higher is faster. First, VMAF scores should scale with resolution, which means lower resolution videos should score a lot worse than higher resolution videos. Notes about vmaf. In any case those 2 seem to be the standard ish metrics people use. Total throughput: How quickly the VMAF score for a video sequence can be computed. txt (this psnr score looks ok, but all vmaf score of each frame is 0. If you want to specify a model by path, you should be able to do it with the command you specified, with the caveat that (due to the reasons I mentioned in my other comment) ModelCollection is not supported from the ffmpeg interface, so you'll have to supply a single Model instead. If you can give me your ffmpeg command you use as a base I can give you the equivalent NVEncC64. Whereas this just samples parts of a video with the goal of finding a single CRF value to encode the entire video with that results in an average VMAF score. 6 Not sure this is even correct. None. Although it also has some flaws. This mode can be activated with the --full_ref command line option. mp4 -i origi If you want to encode your video with 98% VMAF, use the --min-vmaf 98 argument with auto-encode. VMAF. Mar 20, 2024 · VMAF per frame latency: The time required to compute the three feature extractors to obtain a VMAF score for a single frame reflecting responsiveness. exe -i "(sourceVid)" -vf "select=eq(n\,487)" -vframes 1 source. But no matter I specify enable_transform=true or false, I always got the same score. software using VMAF; MATLAB – running other quality algorithms (ST-RRED, ST-MAD, SpEED-QA, and BRISQUE) with MATLAB; Windows – how to build VMAF for Windows; AOM CTC - how to use VMAF compliant with AOM common test You're not feeding two already transcoded files to FFmpeg and expecting a meaningful VMAF output, are you? And if you want a lower quality (VMAF 85 to 90), just use a higher CRF. Dec 8, 2020 · VMAF is not a good metric at all for very high quality encodes. /ffmpeg -i testfile -i reffile -lavfi libvmaf="psnr=1" -f null - then I still get only VMAF. Since VMAF determines your viewing distance with a multiple of the file's vertical resolution as one of the factors it is necessary that the calculations be fed the proper information with regard to the file's resolution or the The file size is pretty much the same and the VMAF score for the h264 was 94 and for the libaom it was 97. mkv \\-m vmaf \\--vmaf-features ciede cambi psnr psnr_hvs However, you'd better use FFMpeg 4 or newer. for this, I installed ffmepg-python and used the following code in python. Now we have the tools to test different crf values to find the highest that gives us a I just posted above also that the VMAF score from the 88 gig source and the 1. That’s because VMAF scores range from 0 to 100, providing a more meaningful spread, and because VMAF is designed to rate files from resolutions ranging from 240p to 1080p and has been used to rate videos as large as 4K. Using FFmpeg+libvmaf is very powerful, as you can create complex filters to calculate VMAF directly on videos of different encoding formats and resolutions. It also suggests we could get the av1 version even smaller and achieve, say, VMAF 95. If you are transcoding a video that will be viewed on a 4K display, the default model (vmaf_v0. Currently it will not compile with libvmaf stable release version. Note; VMAF requires resolutions to match. Nov 6, 2018 · vmaf_score int vmaf_thread_created pthread_t vmaf_thread pthread_mutex_t lock pthread_cond_t cond int eof AVFrame * gmain AVFrame * gref int frame_set char * model_path char * log_path char * log_fmt int disable_clip int disable_avx int enable_transform int phone_model int psnr int ssim int ms_ssim char * pool int Sep 9, 2021 · I am looking for a VMAF-like objective user-perception video quality scanner that functions at scale. I was just wondering about the effects of black bars and not filters. VMAF combines multiple video quality metrics, namely Detail Loss Metric (DLM) [4], Visual Information Fidelity (VIF)[10] and and the Mean Co-Located Pixel Difference (MCPD) [8], into a single score that can be used to evaluate the perceived quality of a video. Testing a 1 minute clip I can't get a VMAF score of over about 74. Run vmaf through FFmpeg using the following command: Jan 8, 2017 · 12 * FFmpeg is distributed in the hope that it will be useful, 13 652 err = vmaf_score_pooled(s->vmaf, s->model, pool_method_map(s->pool), 653 Nov 12, 2018 · I have ffmpeg installed along with libvmaf. Note that an existing quality metric can serve as a feature of a new quality metric. Do you know what's the root cause? cmd 1: . To use VMAF with ffmpeg you need to install libvmaf first and then compile ffmpeg with libvmaf filter enabled. g. /ffmpeg -i scene1. /configure --enable-libvmaf. 1 but I replaced the version of ffmpeg in the Flatpak with the latest SVT-AV1 1. ts > > > VMAF score for externally encoded clip: > > [libvmaf @ 0x7fc53d729500] VMAF score: 25. mp4 --min-vmaf 98. If you are using a mac, add ffmpeg repository to brew. Auto sets model version (4k or 1k) according to resolution. 19 * Foundation, Inc. In this article, I’ll detail where to get FFMetrics, how to install it, and how to use it. ) get rescaled to 1080 resolution and shown on the 1080p display with a viewing distance of three times the screen ffmpeg-quality-metrics-- command-line tool to calculate PSNR, SSIM and VMAF with FFmpeg; EasyVMAF-- command-line tool with video preprocessing for VMAF inputs; Bash wrapper script for running libvmaf through FFmpeg Sep 14, 2019 · VMAF is a perceptual video quality assessment algorithm developed by Netflix. Definition in file vf_vmafmotion. when i use the 4k model (on the same 1080 file) i get 100, but all the scores get higher on this model, even on the compressed files. And, this is the goal of VMAF – matching human perception! Since VMAF can account for the two parts of image quality enhancement and degradation relative to the source, it is gaining considerable usage in video streaming. json) is fine if you are only interested in relative VMAF scores, i. mp4 -filter_complex libvmaf -f null - So this time I switched the order and got these results: h264. , 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Jun 8, 2022 · Saved searches Use saved searches to filter your results more quickly vmaf_score int vmaf_thread_created pthread_t vmaf_thread pthread_mutex_t lock pthread_cond_t cond int eof AVFrame * gmain AVFrame * gref int frame_set char * model_path char * log_path char * log_fmt int disable_clip int disable_avx int enable_transform int phone_model int psnr int ssim int ms_ssim char * pool int Calulate the VMAF (Video Multi-Method Assessment Fusion) score for a reference/distorted pair of input videos. e. If it is, would still expect a higher value for the better codec and 16MB of extra filesize. 240835 is somewhere between what humans rated the highest and lossless. For example, I can even target 70 or even 80% of the original file's bitrate and the VMAF score is still around 97! Incredible! I'm only testing with home videos from my phone VIF is the basis of VMAF, alongside several other image quality metrics (DLM, MCPD and AN-SNR, all described in the VMAF link). /ffmpeg -i testfile -i reffile -lavfi libvmaf -f null - But if I try to get VMAF and PSNR by. With the amount of videos I want working with, it will take nearly a year just to calculate the VMAF scores. I can use it to calculate the VMAF scores of a distorted video against a reference video using commands like this: `ffmpeg -i distorted. I would like to compute a ms_ssim score using ffmpeg. → `compute_vmaf()` is deprecated, so that cant load feature extractors from float model to calcurate vmaf scores. Variables are used in the ffmpeg options by inserting ${VARIABLENAME}. Could you give some help on this? Thanks. Mar 12, 2024 · VMAF excels in aligning with human visual perception by combining detailed analysis of video quality factors with human vision modeling and advanced machine learning. I'm looking at using SSIM, PSNR and VMAF. ffmpeg – how to use VMAF in conjunction with FFmpeg; Docker – how to run VMAF with Docker; External resources – e. mp4 - VMAF score: 62. See full list on websites. In this case, both the --reference and --distorted inputs will be used. It requires Netflix's vmaf library (libvmaf) as a pre-requisite. What I'm wondering is: Is 1-pass still "evil"? 2-pass theoretically enables some advanced bitstream features, but it doesn't seem to change anything in constant quality mode. Some of you here probably use VMAF with FFmpeg to measure video quality and make encoding decisions, so you may find this interesting. 5 to 1 point) than 2-pass encoding. I was testing out some h. Don't know about adm2 or motion2 I used ffmpeg with libvmaf to analyze some transcoded videos and always got an output like "VMAF Score: 94. Sep 27, 2022 · Following the instructions for ffmpeg, we noticed some crashes or random scores when comparing very small inputs (under or equal to a dimension of 32x32): Segmentation fault (core dumped) I can see the same issue with the vmaf tool: vmaf This will run transcode and vmaf analysis for CRF values 22,26,30, and 34. mp4 -c:v libx264 -g 100 -keyint_min 100 >-sc_threshold 0 -b:v 12000k -maxrate 15000k -bufsize 15000k -c:a copy -f > mpegts pass2. exe command. Is it possible the compression is just that good and the resulting file is real? I haven't CPU encoded for a while as was doing nvenc encoding with HEVC previously. I. In the official docs they recommend adding -r 24 before each input to force set the framerate and PTS-STARTPTS to sync the presentation timestamps of the 2 videos. It's a valuable quality metric that can be used to computerize the common media workflow quality analysis instead of relying on people's eyes. Built with PyQt5, this tool enables users to customize various settings, including frame rate, model selection, brightness adjustments, and more. mp4 - VMAF score: 63. And we can subtract this effect from the VMAF scores. mp4 -i source Jun 14, 2019 · Calculate quality metrics with FFmpeg (SSIM, PSNR, VMAF) Author: Optionally, you may install FFmpeg with libvmaf support to run VMAF score calculation: Saved searches Use saved searches to filter your results more quickly You can also use ffmpeg to calculate VMAF scores, or my own tool. xml file (xml-format): May 9, 2022 · > > VMAF score of ffmpeg encoded clip: > > [libvmaf @ 0x7fc5d8f2cb00] VMAF score: 90. 8674 score. The final score for the clip is Sync Info: offset: 0. xml VMAF scores and its components for each frame are stored at logs\test. The obtained VMAF score is printed through the logging system. 37913542219542 VMAF json File Path: distorted-A_vmaf. ” Mar 31, 2020 · I recently setup FFmpeg + libvmaf on AWS EC2 G4 instance (with Tesla T4 GPU) to do transcoding and VMAF measuring for test purpose, it's easy to use GPU to accelerate transcoding with the following params ffmpeg -vsync 0 -hwaccel cuvid - If I remux Sintel_x264_2pass_5000_1. You might be able to use ffmpeg to change both the source and the target to the same constant frame rate and then compare those. The score ranges from 0 to 100, with 100 indicating the highest possible quality. ts of 2 CRF is a technical target of quality, determined by the developers of a particular codec. double LIBVMAFContext::vmaf_score: Definition at line 45 of file vf_libvmaf. , transcoded) video of which resolution is different from the original video prior to the measurement of VMAF score. i use ffmetrics for this proccess. Nov 9, 2020 · In the context of this blog, after calculating VMAF scores of all frames of a sequence, we compute the 1 st, 5 th, 10 th, 25 th, and 50 th percentiles. This can still Oct 25, 2023 · I'm testing ways to compare image similarity using ffmpeg. i dont get it. mkv \\-m psnr ssim vmaf vif Run VMAF with all the features: ffmpeg-quality-metrics dist. This rating is mapped to VMAF scores 0, 20, 40, 60, and 80, while 100 is when they compare the source video to itself. ” Features are individual inputs that (VMAF) models may use to fuse into a final quality metric score. exe yuv420p 1920 1080 ref. While tuning for SSIM did produce the best SSIM score, VMAF ratings for the SSIM tuned clip was significantly lower than the untuned file. Jan 12, 2018 · vmaf_score pthread_t vmaf_thread pthread_mutex_t lock pthread_cond_t cond int eof AVFrame * gmain AVFrame * gref int frame_set char * model_path char * log_path char * log_fmt int disable_clip int disable_avx int enable_transform int phone_model int psnr int ssim int ms_ssim char * pool Aug 12, 2017 · where VMAF_score is the final score and the others are the scores for VMAF's elementary metrics. In addition, VMAF model files must be in sub-folder vmaf-models. It was suggested in a published paper (though I don't recall which) that, for streaming, a good quality/size tradeoff would be a VMAF of 93. CAMBI also offers a full-reference mode which computes its score as MAX(0, distorted_score - reference_score). \ffmpeg. mkv ref. The scaler is typically used for scaling the distorted(e. While such operations could enhance the image quality as perceived by the end viewers if applied properly, it is evident that VMAF tends to overpredict the perceptual quality even when such operations are overused. com/Netflix/vmafVMA Oct 27, 2024 · Specifically, the VMAF scores of x264 and x265 only approach 99. 0 version of VMAF scores are not a linear scale ffmpeg currently needs libvmaf git master. Since VMAF determines your viewing distance with a multiple of the file's vertical resolution as one of the factors it is necessary that the calculations be fed the proper information with regard to the file's resolution or the vmaf_score int vmaf_thread_created pthread_t vmaf_thread pthread_mutex_t lock pthread_cond_t cond int eof AVFrame * gmain AVFrame * gref int frame_set char * model_path char * log_path char * log_fmt int disable_clip int disable_avx int enable_transform int phone_model int psnr int ssim int ms_ssim char * pool int [FFmpeg-user] Disparity in VMAF scores Clayton Macleod cherrytwist at gmail. As for VMAF, I'm using ffmetric, with 'vmaf_v0. From what I understand, av1an calculates VMAF per scene and has to encode a scene & calculate the VMAF with multiple CRF values (when it doesn't get lucky) to find the optimal one for each scene. 0) here is the ffmpeg log: Apr 26, 2022 · I am trying to calculate VMAF using FFmpeg. This is driving me The per-clip feature scores are then fit with the subjective scores to obtain the trained model. So instead I used ffmpeg to dump to yuv and then used vmaf. Personally, I consider a VMAF score over 95 to be “good enough” for my use cases. Refer to this document for detailed usage. /configure --enable-libvmaf . What Did We Learn? Quite a lot. We observed up to a 4. 0-amd64-static/ffmpeg -i 360_vi Oct 23, 2024 · To calculate VMAF scores for individual frames using FFmpeg, we can use the following command: ffmpeg -i ref_video. The grayscale map in (f) above demonstrates the magnitude of the image sharpening performed in tune=vmaf. mp4 -i test_video. Handbrake is v. mp4 -filter_complex "[0:v]scale=640 Oct 22, 2022 · On the other hand, if you don’t have $995 handy or even if you’re just looking for an easy way to compute VMAF scores with FFmpeg, you should definitely consider FFMetrics, which is free and open-source. 8. Example [compute VMAF scores for 1080p video using the model 4k_v0. Jul 8, 2024 · The left image that uses “deblocking filters” produces a lower VMAF score because of the visible blurring. I wouldn't expect FP rounding errors at this scale, especially for double precision, but it's certainly possible. Links:FFmpeg: https://ffmpeg. Other Options. FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. Aug 7, 2018 · To compute the VMAF score of a video using FFmpeg, normally, I think the process is of three steps: step1: transcode the origin video into the distorted video; step2: transcode the distorted video to be of the same resolution with the origin video; step3: compute the VMAF score of the distorted video using ffmpeg -lavfi libvmaf command. here is the vmaf json file: comp3. , when using VMAF via FFmpeg). Refer VMAF score to reduce bitrate of RTMP live streaming. After that do make install. yuv vmaf_4k_v0. The filter works fine if the model file is found and has Unix line endings, otherwise it crashes. In run_testing, the per-frame feature scores are first extracted, then the prediction model is applied on a per-frame basis, resulting "per-frame VMAF score". If you use the most recent FFMpeg builds, the vmaf models could be in-build into it so you do not need to use separate vmaf models. Mar 4, 2019 · I frequently use the VMAF quality metric to analyze encoding parameters and compare codecs. Generated on Wed Aug 24 2022 21:32:33 for FFmpeg by (FFmpeg) Getting identical VMAF scores for pool=mean and pool=harmonic_mean #1274. I think, psy-rd is the main reason for decrease in video quality. Refer to the Using VMAF with FFmpeg page. The reported SRCC, PCC and RMSE are the fitting result. 2 in FFMPEG on a AMD 5850u. fraunhofer. Though Netflix notes that there are other averaging techniques available, the article states that “simple arithmetic mean (AM) is the best way of averaging, in that it yields the highest correlation with subjective scores. I have an ffmpeg version built with VMAF library. Command I have used: ffmpeg -y -loglevel info -stats -i original. Works with videos and images. pkl --log logs\test. However the h264 seems to retain the fine details much better than libaom av1 version as seen in the attached photo. If I remux Sintel_x264_2pass_5000_1. And 1080p YT files against that 1080p DNxHR (downres'd from the 4k master) -6 Profit Blue bars are bitrates of files YT provided back, right scale. YT appears to target the following What you need: OS: Linux, macOS, Windows; Python 3. 8 or higher; FFmpeg: Linux: Download the git master build from here. Sep 4, 2017 · But with respect to a source, VMAF can provide the 1-jnd increments for a bitrate ladder (6 VMAF points ~ 1 JND). VMAF score. 0 to caculate the vmaf score of transcode video. It is VMAF + FFmpeg on a web browser - you can input a pair of videos (e. The way I use vmaf is by testing my source, let's say my source scores a 98 vmaf score. 1080p: I've compiled ffmpeg with libvmaf on Windows using MinGW. Vmaf is only available as a command line application and you have to learn how to use ffmpeg to enable vmaf to do its thing. Originally, there was only one VMAF version, but Netflix has added both a 4K model and … This post showcases how CUDA-accelerated VMAF (VMAF-CUDA) enables VMAF scores to be calculated on NVIDIA GPUs. urj zdzja ohcv uuxtv rdmu dgxx ueafvqrbk mjcfu osfgele vjtovzx