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• Metadict in ffmpeg does not have rotate information

  14 juillet 2022, par Lucky Sunda

  My aim is to extract frames out of a video but many times the frames are inverted. This is happening because "VideoCapture" in cv2 does read the rotate flag data present in the video metadata. I am running it on mac and installed "ffmpeg" package (5.0.1) using brew package manager. This is my code to check rotation present in a video using ffmpeg.

  


  import ffmpeg 
import cv2   
import pprint 
pp = pprint.PrettyPrinter(depth=4)
def check_rotation(path_video_file):
    # this returns meta-data of the video file in form of a dictionary
    meta_dict = ffmpeg.probe(path_video_file)
    pp.pprint(meta_dict)

    # from the dictionary, meta_dict['streams'][0]['tags']['rotate'] is the key
    # we are looking for
    rotateCode = None
    if int(meta_dict['streams'][0]['tags']['rotate']) == 90:
        rotateCode = cv2.ROTATE_90_CLOCKWISE
    elif int(meta_dict['streams'][0]['tags']['rotate']) == 180:
        rotateCode = cv2.ROTATE_180
    elif int(meta_dict['streams'][0]['tags']['rotate']) == 270:
        rotateCode = cv2.ROTATE_90_COUNTERCLOCKWISE

    return rotateCode



  


  Here the meta_dict is supposed to have information about the rotation but it is not there.
printing out meta_dict gives :

  


  {'format': {'bit_rate': '18498544',
            'duration': '3.584000',
            'filename': 'video.mp4',
            'format_long_name': 'QuickTime / MOV',
            'format_name': 'mov,mp4,m4a,3gp,3g2,mj2',
            'nb_programs': 0,
            'nb_streams': 2,
            'probe_score': 100,
            'size': '8287348',
            'start_time': '0.000000',
            'tags': {'com.android.version': '11',
                     'compatible_brands': 'isommp42',
                     'creation_time': '2021-12-08T10:56:57.000000Z',
                     'major_brand': 'mp42',
                     'minor_version': '0'}},
 'streams': [{'avg_frame_rate': '990000/34997',
              'bit_rate': '18804651',
              'bits_per_raw_sample': '8',
              'chroma_location': 'left',
              'closed_captions': 0,
              'codec_long_name': 'H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10',
              'codec_name': 'h264',
              'codec_tag': '0x31637661',
              'codec_tag_string': 'avc1',
              'codec_type': 'video',
              'coded_height': 1080,
              'coded_width': 1920,
              'color_primaries': 'bt470bg',
              'color_range': 'pc',
              'color_space': 'bt470bg',
              'color_transfer': 'smpte170m',
              'display_aspect_ratio': '16:9',
              'disposition': {'attached_pic': 0,
                              'captions': 0,
                              'clean_effects': 0,
                              'comment': 0,
                              'default': 1,
                              'dependent': 0,
                              'descriptions': 0,
                              'dub': 0,
                              'forced': 0,
                              'hearing_impaired': 0,
                              'karaoke': 0,
                              'lyrics': 0,
                              'metadata': 0,
                              'original': 0,
                              'still_image': 0,
                              'timed_thumbnails': 0,
                              'visual_impaired': 0},
              'duration': '3.499700',
              'duration_ts': 314973,
              'extradata_size': 35,
              'field_order': 'progressive',
              'film_grain': 0,
              'has_b_frames': 0,
              'height': 1080,
              'id': '0x1',
              'index': 0,
              'is_avc': 'true',
              'level': 40,
              'nal_length_size': '4',
              'nb_frames': '99',
              'pix_fmt': 'yuvj420p',
              'profile': 'High',
              'r_frame_rate': '120/1',
              'refs': 1,
              'sample_aspect_ratio': '1:1',
              'side_data_list': [{...}],
              'start_pts': 3168,
              'start_time': '0.035200',
              'tags': {'creation_time': '2021-12-08T10:56:57.000000Z',
                       'handler_name': 'VideoHandle',
                       'language': 'eng',
                       'vendor_id': '[0][0][0][0]'},
              'time_base': '1/90000',
              'width': 1920},
             {'avg_frame_rate': '0/0',
              'bit_rate': '128986',
              'bits_per_sample': 0,
              'channel_layout': 'stereo',
              'channels': 2,
              'codec_long_name': 'AAC (Advanced Audio Coding)',
              'codec_name': 'aac',
              'codec_tag': '0x6134706d',
              'codec_tag_string': 'mp4a',
              'codec_type': 'audio',
              'disposition': {'attached_pic': 0,
                              'captions': 0,
                              'clean_effects': 0,
                              'comment': 0,
                              'default': 1,
                              'dependent': 0,
                              'descriptions': 0,
                              'dub': 0,
                              'forced': 0,
                              'hearing_impaired': 0,
                              'karaoke': 0,
                              'lyrics': 0,
                              'metadata': 0,
                              'original': 0,
                              'still_image': 0,
                              'timed_thumbnails': 0,
                              'visual_impaired': 0},
              'duration': '3.584000',
              'duration_ts': 172032,
              'extradata_size': 2,
              'id': '0x2',
              'index': 1,
              'nb_frames': '168',
              'profile': 'LC',
              'r_frame_rate': '0/0',
              'sample_fmt': 'fltp',
              'sample_rate': '48000',
              'start_pts': 0,
              'start_time': '0.000000',
              'tags': {'creation_time': '2021-12-08T10:56:57.000000Z',
                       'handler_name': 'SoundHandle',
                       'language': 'eng',
                       'vendor_id': '[0][0][0][0]'},
              'time_base': '1/48000'}]}


  


  Can someone please help me to find if rotation is present in a video ?

  


• How to detect delay or silence in an audio file ?

  15 juillet 2022, par Lynob

  I want to detect silence or delay in audio for a given duration file and remove it. For example, if someone started speaking and then paused for some duration to think.

  


  There's this question but it only detects the silence at the end and doesn't remove it. My colleague suggested sox but I'm not sure if it's the best tool for the job nor how to use it frankly, moreover, the project died in 2015.

  


• How to calculate vmaf score of multi-resolution webm using ffmpeg ?

  13 juillet 2022, par will

  I’m trying to calculate the vmaf of two videos, one is avi(rawvideo(I420), yuv420p), the other is webm(vp8, yuv420p). I uploaded test video and vmaf log here.

  


  But I found that if it’s a multi-resolution webm, the scores obtained with and without fps filter are quite different. Without fps filter the vmaf score is 34.670390, with fps filter the vmaf score is 56.339923.

  


  If it‘s a single resolution webm, there is no significant difference between the scores obtained with and without fps filter. Without fps filter the vmaf score is 65.527304, with fps filter the vmaf score is 65.480217.

  


  I use these commands.

  


  without fps filter

  


  ffmpeg \
    -r 15 -i reference.avi \
    -r 15 -i distorted.webm \
    -lavfi "[0:v]setpts=PTS-STARTPTS[reference]; \
            [1:v]scale=1920:1080:flags=bicubic,setpts=PTS-STARTPTS[distorted]; \
            [distorted][reference]libvmaf=log_fmt=json:log_path=vmaf_without_fps.log:model_path=vmaf_v0.6.1.json:n_threads=10:ssim=1:psnr=1" \
    -f null -


  


  ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.4.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, avi, from 'reference.avi':
  Metadata:
    software        : Lavf58.76.100
  Duration: 00:00:26.13, start: 0.000000, bitrate: 373260 kb/s
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 374202 kb/s, 15 fps, 15 tbr, 15 tbn, 15 tbc
Input #1, matroska,webm, from 'distorted.webm':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #1:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
  Stream #1:1(eng): Video: vp8, yuv420p(progressive), 1920x1080, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
Stream mapping:
  Stream #0:0 (rawvideo) -> setpts (graph 0)
  Stream #1:1 (vp8) -> scale (graph 0)
  libvmaf (graph 0) -> Stream #0:0 (wrapped_avframe)
  Stream #1:0 -> #0:1 (opus (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
libvmaf INFO `compute_vmaf()` is deprecated and will be removed in a future libvmaf version
Output #0, null, to 'pipe:':
  Metadata:
    software        : Lavf58.76.100
    encoder         : Lavf58.76.100
  Stream #0:0: Video: wrapped_avframe, yuv420p(tv, bt470bg/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 15 fps, 15 tbn (default)
    Metadata:
      encoder         : Lavc58.134.100 wrapped_avframe
  Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      encoder         : Lavc58.134.100 pcm_s16le
[libvmaf @ 0x7feb8a606a80] VMAF score: 58.1203705.87 bitrate=N/A speed= 5.6x    
libvmaf INFO `compute_vmaf()` is deprecated and will be removed in a future libvmaf version
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 0
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 1
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 2
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 3
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 4
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 5
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 6
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 7
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 8
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 9
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 10
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 11
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 12
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 13
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 14
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 15
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 16
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 17
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 18
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 19
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 20
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 21
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 22
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 23
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 24
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 25
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 26
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 27
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 28
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 29
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 30
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 31
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 32
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 33
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 34
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 35
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 36
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 37
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 38
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 39
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 40
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 41
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 42
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 43
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 44
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 45
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 46
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 47
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 48
[null @ 0x7feb8b04da00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 49 >= 49
frame=  392 fps= 36 q=-0.0 Lsize=N/A time=00:00:28.73 bitrate=N/A speed= 2.6x    
video:205kB audio:5400kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libvmaf @ 0x7feb8c405bc0] VMAF score: 34.670390


  


  with fps filter

  


  ffmpeg \
    -r 15 -i reference.avi \
    -r 15 -i distorted.webm \
    -lavfi "[0:v]setpts=PTS-STARTPTS[reference]; \
            [1:v]fps=fps=15,scale=1920:1080:flags=bicubic,setpts=PTS-STARTPTS[distorted]; \
            [distorted][reference]libvmaf=log_fmt=json:log_path=vmaf_with_fps.log:model_path=vmaf_v0.6.1.json:n_threads=10:ssim=1:psnr=1" \
    -f null -


  


  ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.4.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, avi, from 'reference.avi':
  Metadata:
    software        : Lavf58.76.100
  Duration: 00:00:26.13, start: 0.000000, bitrate: 373260 kb/s
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 374202 kb/s, 15 fps, 15 tbr, 15 tbn, 15 tbc
Input #1, matroska,webm, from 'distorted.webm':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #1:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
  Stream #1:1(eng): Video: vp8, yuv420p(progressive), 1920x1080, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
Stream mapping:
  Stream #0:0 (rawvideo) -> setpts (graph 0)
  Stream #1:1 (vp8) -> fps (graph 0)
  libvmaf (graph 0) -> Stream #0:0 (wrapped_avframe)
  Stream #1:0 -> #0:1 (opus (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
libvmaf INFO `compute_vmaf()` is deprecated and will be removed in a future libvmaf version
Output #0, null, to 'pipe:':
  Metadata:
    software        : Lavf58.76.100
    encoder         : Lavf58.76.100
  Stream #0:0: Video: wrapped_avframe, yuv420p(tv, bt470bg/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 15 fps, 15 tbn (default)
    Metadata:
      encoder         : Lavc58.134.100 wrapped_avframe
  Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      encoder         : Lavc58.134.100 pcm_s16le
[libvmaf @ 0x7fdeab00bac0] VMAF score: 58.3160815.27 bitrate=N/A speed=5.08x    
libvmaf INFO `compute_vmaf()` is deprecated and will be removed in a future libvmaf version
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 0
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 1
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 2
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 3
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 4
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 5
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 6
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 7
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 8
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 9
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 10
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 11
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 12
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 13
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 14
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 15
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 16
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 17
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 18
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 19
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 20
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 21
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 22
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 23
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 24
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 25
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 26
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 27
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 28
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 29
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 30
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 31
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 32
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 33
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 34
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 35
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 36
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 37
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 38
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 39
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 40
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 41
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 42
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 43
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 44
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 45
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 46
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 47
[null @ 0x7fdeab84ba00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 48 >= 48
frame=  391 fps= 36 q=-0.0 Lsize=N/A time=00:00:28.73 bitrate=N/A speed=2.62x    
video:205kB audio:5400kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libvmaf @ 0x7fdea9f34a00] VMAF score: 56.339923


  


  I'm curious about what causes such a difference ? And how to calculate vmaf score of multi-resolution webm correctly ?