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• Decrypting fragmented mpeg-dash using ffmpeg

  6 octobre 2022, par Sayem Prodhan Ananta

  I have an mpeg-dash which I want to decrypt. I have the CENC decryption key. But I am unable to get it working. The dash uses segment template. Here is the dash

  


  &lt;?xml version="1.0" ?>&#xA;<mpd mediapresentationduration="PT1H55M53.987S" minbuffertime="PT6.00S" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" xmlns="urn:mpeg:dash:schema:mpd:2011">&#xA;  &#xA;  <period>&#xA;    &#xA;    <adaptationset maxheight="720" maxwidth="1280" mimetype="video/mp4" segmentalignment="true" startwithsap="1">&#xA;      <accessibility schemeiduri="urn:scte:dash:cc:cea-608:2015" value="eng"></accessibility>&#xA;      <viewpoint schemeiduri="urn:mpeg:dash:role:2011" value="vp2"></viewpoint>&#xA;      &#xA;      <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95">&#xA;        pAIAAAEAAQCaAjwAVwBSAE0ASABFAEEARABFAFIAIAB4AG0AbABuAHMAPQAiAGgAdAB0AHAAOgAvAC8AcwBjAGgAZQBtAGEAcwAuAG0AaQBjAHIAbwBzAG8AZgB0AC4AYwBvAG0ALwBEAFIATQAvADIAMAAwADcALwAwADMALwBQAGwAYQB5AFIAZQBhAGQAeQBIAGUAYQBkAGUAcgAiACAAdgBlAHIAcwBpAG8AbgA9ACIANAAuADAALgAwAC4AMAAiAD4APABEAEEAVABBAD4APABQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsARQBZAEwARQBOAD4AMQA2ADwALwBLAEUAWQBMAEUATgA&#x2B;ADwAQQBMAEcASQBEAD4AQQBFAFMAQwBUAFIAPAAvAEEATABHAEkARAA&#x2B;ADwALwBQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsASQBEAD4AOABoAFcAMwBQAEsAeABPAEkAYwB1AGsAVwBWAHgASwBaAHgAMgA3AEMAZwA9AD0APAAvAEsASQBEAD4APABDAEgARQBDAEsAUwBVAE0APgBBAGQARgAvAFEAcwBzAHEATQBhAEEAPQA8AC8AQwBIAEUAQwBLAFMAVQBNAD4APABMAEEAXwBVAFIATAA&#x2B;AGgAdAB0AHAAOgAvAC8AcAByAC4AcwBlAHIAdgBpAGMAZQAuAGUAeABwAHIAZQBzAHMAcABsAGEAeQAuAGMAbwBtAC8AcABsAGEAeQByAGUAYQBkAHkALwBSAGkAZwBoAHQAcwBNAGEAbgBhAGcAZQByAC4AYQBzAG0AeAA8AC8ATABBAF8AVQBSAEwAPgA8AC8ARABBAFQAQQA&#x2B;ADwALwBXAFIATQBIAEUAQQBEAEUAUgA&#x2B;AA==&#xA;      </contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">&#xA;        AAAAQ3Bzc2gAAAAA7e&#x2B;LqXnWSs6jyCfc1R0h7QAAACMIARIQPLcV8k6syyGkWVxKZx27ChoKaW50ZXJ0cnVzdCIBKg==&#xA;      </contentprotection>&#xA;      <segmenttemplate duration="6000" initialization="$RepresentationID$/init.mp4" media="$RepresentationID$/seg-$Number$.m4s" startnumber="1" timescale="1000"></segmenttemplate>&#xA;      <representation bandwidth="634478" codecs="avc1.4D401F" framerate="2997/100" height="288" scantype="progressive" width="512"></representation>&#xA;      <representation bandwidth="789637" codecs="avc1.4D401F" framerate="2997/100" height="360" scantype="progressive" width="640"></representation>&#xA;      <representation bandwidth="1562569" codecs="avc1.4D401F" framerate="2997/100" height="432" scantype="progressive" width="768"></representation>&#xA;      <representation bandwidth="2124583" codecs="avc1.4D401F" framerate="2997/100" height="720" scantype="progressive" width="1280"></representation>&#xA;    </adaptationset>&#xA;    &#xA;    <adaptationset lang="en" mimetype="audio/mp4" segmentalignment="true" startwithsap="1">&#xA;      &#xA;      <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95">&#xA;        pAIAAAEAAQCaAjwAVwBSAE0ASABFAEEARABFAFIAIAB4AG0AbABuAHMAPQAiAGgAdAB0AHAAOgAvAC8AcwBjAGgAZQBtAGEAcwAuAG0AaQBjAHIAbwBzAG8AZgB0AC4AYwBvAG0ALwBEAFIATQAvADIAMAAwADcALwAwADMALwBQAGwAYQB5AFIAZQBhAGQAeQBIAGUAYQBkAGUAcgAiACAAdgBlAHIAcwBpAG8AbgA9ACIANAAuADAALgAwAC4AMAAiAD4APABEAEEAVABBAD4APABQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsARQBZAEwARQBOAD4AMQA2ADwALwBLAEUAWQBMAEUATgA&#x2B;ADwAQQBMAEcASQBEAD4AQQBFAFMAQwBUAFIAPAAvAEEATABHAEkARAA&#x2B;ADwALwBQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsASQBEAD4AOABoAFcAMwBQAEsAeABPAEkAYwB1AGsAVwBWAHgASwBaAHgAMgA3AEMAZwA9AD0APAAvAEsASQBEAD4APABDAEgARQBDAEsAUwBVAE0APgBBAGQARgAvAFEAcwBzAHEATQBhAEEAPQA8AC8AQwBIAEUAQwBLAFMAVQBNAD4APABMAEEAXwBVAFIATAA&#x2B;AGgAdAB0AHAAOgAvAC8AcAByAC4AcwBlAHIAdgBpAGMAZQAuAGUAeABwAHIAZQBzAHMAcABsAGEAeQAuAGMAbwBtAC8AcABsAGEAeQByAGUAYQBkAHkALwBSAGkAZwBoAHQAcwBNAGEAbgBhAGcAZQByAC4AYQBzAG0AeAA8AC8ATABBAF8AVQBSAEwAPgA8AC8ARABBAFQAQQA&#x2B;ADwALwBXAFIATQBIAEUAQQBEAEUAUgA&#x2B;AA==&#xA;      </contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">&#xA;        AAAAQ3Bzc2gAAAAA7e&#x2B;LqXnWSs6jyCfc1R0h7QAAACMIARIQPLcV8k6syyGkWVxKZx27ChoKaW50ZXJ0cnVzdCIBKg==&#xA;      </contentprotection>&#xA;      <segmenttemplate duration="6000" initialization="$RepresentationID$/init.mp4" media="$RepresentationID$/seg-$Number$.m4s" startnumber="1" timescale="1000"></segmenttemplate>&#xA;      <representation audiosamplingrate="48000" bandwidth="136225" codecs="mp4a.40.2">&#xA;        <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>&#xA;      </representation>&#xA;    </adaptationset>&#xA;  </period>&#xA;</mpd>&#xA;

  


  I have produced an mp4 file by combining all the segments like this

  


  init.mp4+seg-1.m4s+seg-2.m4s+....+seg-1159.m4s


  


  But I end up with following error

  


  ffmpeg version N-99631-g9018257751-anan5a-2020-10-19 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --extra-version=anan5a-2020-10-19 --enable-gpl --enable-version3 --disable-shared --enable-static --enable-small --enable-avisynth --enable-chromaprint --enable-frei0r --enable-gmp --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-openal --enable-opencl --enable-opengl --enable-libdrm --enable-nonfree --enable-libfdk-aac --enable-libbluray --enable-libzimg --enable-libsvtav1
  libavutil      56. 60.100 / 56. 60.100
  libavcodec     58.111.101 / 58.111.101
  libavformat    58. 62.100 / 58. 62.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x557789b49300] Incorrect number of samples in encryption info
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x557789b49300] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 512x288, 616 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../videos/enc.0a7bd4e9ec72b6e0-5549.mkv':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41iso5iso6
  Duration: 01:55:47.95, bitrate: 625 kb/s
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 512x288, 616 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 11988 tbr, 11988 tbn, 23976 tbc (default)
    Metadata:
      handler_name    : Bento4 Video Handler
    Side data:
      unknown side data type 24 (779 bytes)
Output #0, matroska, to '../videos/dec.0a7bd4e9ec72b6e0-5549.mkv':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41iso5iso6
    encoder         : Lavf58.62.100
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 512x288 [SAR 1:1 DAR 16:9], q=2-31, 616 kb/s, 29.97 fps, 11988 tbr, 1k tbn, 11988 tbc (default)
    Metadata:
      handler_name    : Bento4 Video Handler
    Side data:
      unknown side data type 24 (779 bytes)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x557789b49300] Incorrect number of samples in encryption info
../videos/enc.0a7bd4e9ec72b6e0-5549.mkv: Invalid data found when processing input
frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


  How can I achieve the decryption without error ??

  


• FFMPEG Audio/video out of sync after cutting and concatonating even after transcoding

  4 mai 2020, par Ham789

  I am attempting to take cuts from a set of videos and concatonate them together with the concat demuxer.

  



  However, the audio is out of sync of the video in the output. The audio seems to drift further out of sync as the video progresses. Interestingly, if I click to seek another time in the video with the progress bar on the player, the audio becomes synced up with the video but then gradually drifts out of sync again. Seeking to a new time in the player seems to reset the audio/video. It is like they are being played back at different rates or something. I get this behaviour in both Quicktime and VLC players.

  



  For each video, I decode it, trim a clip from it and then encode it to 4k resolution at 25 fps with its audio :

  



  ffmpeg -ss 0.5 -t 0.5 -i input_video1.mp4 -r 25 -vf scale=3840:2160 output_video1.mp4

  



  I then take each of these videos and concatonate them together with the concat demuxer :

  



  ffmpeg -f concat -safe 0 -i cut_videos.txt -c copy -y output.mp4

  



  I am taking short cuts of each video (approximately 0.5s)

  



  I am using Python's subprocess to automate the cutting and concatonating of the videos.

  



  I am not sure if this happens because of the trimming or concatenation steps but when I play back the intermediate cut video files (output_video1.mp4 in the above command), there seems to be some silence before the audio comes in at the start of the video.

  



  When I concatonate the videos, I sometimes get a lot of these warnings however the audio still becomes out of sync even when I do not get them :

  



  [mp4 @ 0000021a252ce080] Non-monotonous DTS in output stream 0:1; previous: 51792, current: 50009; changing to 51793. This may result in incorrect timestamps in the output file.

  



  From this post, it seems to be a problem with cutting the videos and their timestamps. The solution proposed in the post is to decode, cut and then encode the video however I am already doing that.

  



  How can I ensure the audio and video are in sync ? Am I transcoding incorrectly ? This seems to be the only solution I can find online however it does not seem to work.

  



  UPDATE :

  



  I took inspiration from this post and seperated the audio and video from output_video1.mp4 using :

  



  ffmpeg -i output_video1.mp4 -acodec copy -vn video.mp4

  



  and

  



  ffmpeg -i output_video1.mp4 -vcodec copy -an audio.mp4

  



  I then compared the durations of video.mp4 and audio.mp4 and got 0.57s and 0.52s respectively. Since the video is longer, this explains why there is a period of silence in the videos. The post then suggests transcoding is the solution however as you can see from the code above that does not work for me.

  



  Sample Output Log for the Trim Command

  



    built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_video1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:04.06, start: 0.000000, bitrate: 14266 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 3840x2160, 14268 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 94 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
File 'output_video1.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7fcae4001e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fcae4001e00] profile High, level 5.1
[libx264 @ 0x7fcae4001e00] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output_video1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 3840x2160, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : Core Media Video
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
      encoder         : Lavc58.54.100 aac
frame=   14 fps=7.0 q=-1.0 Lsize=     928kB time=00:00:00.51 bitrate=14884.2kbits/s dup=0 drop=1 speed=0.255x    
video:922kB audio:5kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.194501%
[libx264 @ 0x7fcae4001e00] frame I:1     Avg QP:21.06  size:228519
[libx264 @ 0x7fcae4001e00] frame P:4     Avg QP:22.03  size: 85228
[libx264 @ 0x7fcae4001e00] frame B:9     Avg QP:22.88  size: 41537
[libx264 @ 0x7fcae4001e00] consecutive B-frames: 14.3%  0.0%  0.0% 85.7%
[libx264 @ 0x7fcae4001e00] mb I  I16..4: 27.6% 64.3%  8.1%
[libx264 @ 0x7fcae4001e00] mb P  I16..4:  9.1% 10.7%  0.2%  P16..4: 48.5%  7.3%  3.9%  0.0%  0.0%    skip:20.2%
[libx264 @ 0x7fcae4001e00] mb B  I16..4:  1.1%  1.0%  0.0%  B16..8: 44.5%  2.9%  0.2%  direct: 8.3%  skip:42.0%  L0:45.6% L1:53.2% BI: 1.2%
[libx264 @ 0x7fcae4001e00] 8x8 transform intra:58.2% inter:93.4%
[libx264 @ 0x7fcae4001e00] coded y,uvDC,uvAC intra: 31.4% 62.2% 5.2% inter: 11.4% 30.9% 0.0%
[libx264 @ 0x7fcae4001e00] i16 v,h,dc,p: 15% 52% 12% 21%
[libx264 @ 0x7fcae4001e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 33% 32%  2%  2%  2%  4%  2%  4%
[libx264 @ 0x7fcae4001e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 39%  9%  3%  4%  4% 12%  3%  4%
[libx264 @ 0x7fcae4001e00] i8c dc,h,v,p: 43% 36% 18%  3%
[libx264 @ 0x7fcae4001e00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fcae4001e00] ref P L0: 69.3%  8.0% 14.8%  7.9%
[libx264 @ 0x7fcae4001e00] ref B L0: 88.1%  9.2%  2.6%
[libx264 @ 0x7fcae4001e00] ref B L1: 90.2%  9.8%
[libx264 @ 0x7fcae4001e00] kb/s:13475.29
[aac @ 0x7fcae4012400] Qavg: 125.000```


  


• How do I properly format a request for ffmpeg to decode using a particular codec ? [migrated]

  9 mai 2013, par user2062660

  r3d is listed as a supported codec for decoding, however when I attempt to specify the r3d decoder, I get the error message "Unknown decoder". What is the correct manner of specifying a decoder codec ?

  me$ ffmpeg -c r3d -i one.r3d one.mpg
  
  ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on May  8 2013 19:48:08 with Apple clang version 4.0 (tags/Apple/clang-421.0.57) (based on LLVM 3.1svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [mp3 @ 0x7fa2e4006600] Format mp3 detected only with low score of 1, misdetection possible!
  
  Unknown decoder 'r3d'