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• How to send ffmpeg AVPacket through WebRTC (using libdatachannel)

  14 novembre 2022, par mike

  I'm encoding a video frame with the ffmpeg libraries, generating an AVPacket with compressed data.

  


  Thanks to some recent advice here on S/O, I am trying to send that frame over a network using the WebRTC library libdatachannel, specifically by adapting the example here :

  


  https://github.com/paullouisageneau/libdatachannel/tree/master/examples/streamer

  


  I am seeing problems inside h264rtppacketizer.cpp (part of the library, not the example) which are almost certainly to do with how I'm providing the sample data.
(I don't think that this is anything to do with libdatachannel specifically, it will be an issue with what I'm sending)

  


  The example code reads each encoded frame from a file, and populates a sample by setting the content of the file to the contents of the file :

  


  sample = *reinterpret_cast *>(&fileContents);

  


  sample is just a std::vector<byte>;</byte>

  


  I have naively copied the contents of an AVPacket->data pointer into the sample vector :

  


  sample.resize(pkt->size);
memcpy(sample.data(), pkt->data, pkt->size * sizeof(std::byte));    


  


  but the packetizer is falling over when trying to get length values out of that data.
Specifically, in the following code, the first iteration gets a length of 1, but the second, looking up index 5, gives 1119887324. This is way too big for my data, which is only 3526 bytes (the whole frame is a single colour so likely to be small once encoded) :

  


  while (index &lt; message->size()) {&#xA;assert(index &#x2B; 4 &lt; message->size());&#xA;auto lengthPtr = (uint32_t *)(message->data() &#x2B; index);&#xA;uint32_t length = ntohl(*lengthPtr);&#xA;auto naluStartIndex = index &#x2B; 4;&#xA;auto naluEndIndex = naluStartIndex &#x2B; length;&#xA;assert(naluEndIndex &lt;= message->size());    &#xA;        &#xA;auto begin = message->begin() &#x2B; naluStartIndex;&#xA;auto end = message->begin() &#x2B; naluEndIndex;&#xA;nalus->push_back(std::make_shared<nalunit>(begin, end));&#xA;index = naluEndIndex;&#xA;}&#xA;</nalunit>

  


  Here is a dump of

  


  uint32_t length = ntohl(*lengthPtr);


  


  for the first few elements of the message (*lengthPtr in parentheses) :

  


  [2022-03-29 15:12:01.182] [info] index 0: 1  (16777216)
[2022-03-29 15:12:01.183] [info] index 1: 359  (1728118784)
[2022-03-29 15:12:01.184] [info] index 2: 91970  (1114046720)
[2022-03-29 15:12:01.186] [info] index 3: 23544512  (3225577217)
[2022-03-29 15:12:01.186] [info] index 4: 1732427807  (532693607)
[2022-03-29 15:12:01.187] [info] index 5: 1119887324  (3693068354)
[2022-03-29 15:12:01.188] [info] index 6: 3223313413  (98312128)
[2022-03-29 15:12:01.188] [info] index 7: 534512896  (384031)
[2022-03-29 15:12:01.188] [info] index 8: 3691315291  (1526728156)
[2022-03-29 15:12:01.189] [info] index 9: 83909537  (2707095557)
[2022-03-29 15:12:01.189] [info] index 10: 6004992  (10574592)
[2022-03-29 15:12:01.190] [info] index 11: 1537277952  (41307)
[2022-03-29 15:12:01.190] [info] index 12: 2701131779  (50331809)
[2022-03-29 15:12:01.192] [info] index 13: 768  (196608)


  


  (I know I should post a complete sample, I am working on it)

  


  


  • I am fairly sure I am just missing something basic. E.g. am I supposed to do something with the AVPacket side_data, does AVPacket have or miss some header info ?

    


  


  • If I just fwrite the pkt->data for a single frame to disk, I can read the codec information with ffprobe :

    


  


  


  Input #0, h264, from 'encodedOut.h264':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(progressive), 1280x720, 30 tbr, 1200k tbn


  


  Update : This issue is solved by changing the H264RtpPacketizer separator setting from H264RtpPacketizer::Separator::Length to H264RtpPacketizer::Separator::LongStartSequence, many thanks to author of libdatachannel paullouisageneau (see answer below)

  


  I have issues related to settings for the libx264 encoder, but can happily encode with h264_nvenc and h264_mf

  


• ffmpeg extracting frames from a 60 fps video

  15 juillet 2022, par ggt bnd

  I would like to extract frames from a 60 fps video, all of them I used the ffmpeg code
sevral times on lower fps videos
' ffmpeg -i test.mp4 -qscale:v 1 -qmin 1 -qmax 1 -vsync 0 tmp_frames/frame%08d.jpg "
and it works just fine, knowing that the default fps is 24
how can I change it so it extract at 60 fps
ffmpeg version " ffmpeg-2022-07-06-git-03d81a044a-full_build "

  


• Strange problem with inotifywait, while do and ffmpeg

  27 juillet 2022, par cluelessdev

  Linux Mint 20.3 up to date.
I'd like to convert and rename with ffmpeg some files which appear in a folder.
When not using the ffmpeg line everything works fine (note ffmpeg is commented out here)
`

  


  #!/bin/bash
rm flist.txt
watchdir=/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/
startdate=54
starttime=32
while read -r fullpath 
do
    echo "fullpath '$fullpath'" >> flist.txt
        lenght=${#fullpath}
    echo 'lenght ' $lenght >> flist.txt 
    basedate=${fullpath:lenght-startdate:4}${fullpath:lenght-startdate+5:2}${fullpath:lenght-startdate+8:2}
    basetime=${fullpath:lenght-starttime:2}${fullpath:lenght-starttime+3:2}${fullpath:lenght-starttime+6:2} 
    echo basedate "'$basedate'" >> flist.txt
    echo basetime "'$basetime'" >> flist.txt
    newfilename="/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/test2/recordings-convert/"$basedate"-"$basetime"-doorcam".mkv
    # ffmpeg -y -i $fullpath -c:v copy -movflags +faststart $newfilename &> /dev/null
done < <(inotifywait -m -r "$watchdir" --format '%w%f' -e create -e moved_to | grep '\.dav$' --line-buffered)


  


  This does produce the desired result without ffmeg conversion :

  


  $cat flist.txt
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/00/00.01.33-00.01.55[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '000133'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/00/00.29.26-00.29.48[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '002926'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/00/00.33.09-00.33.32[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '003309'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/02/02.23.35-02.23.56[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '022335'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/02/02.27.19-02.27.40[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '022719'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/04/04.08.22-04.08.43[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '040822'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/06/06.50.14-06.50.40[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '065014'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/06/06.50.43-06.51.28[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '065043'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/06/06.56.56-06.58.02[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '065656'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/09/09.18.31-09.19.09[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '091831'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/09/09.47.54-09.55.00[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '094754'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/09/09.55.00-09.55.50[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '095500'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/10/10.20.23-10.20.44[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '102023'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/10/10.24.24-10.24.44[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '102424'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/11/11.00.39-11.01.34[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '110039'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/13/13.26.22-13.26.53[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '132622'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.00.09-16.01.04[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '160009'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.38.46-16.39.15[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '163846'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.56.05-16.56.30[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '165605'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.56.30-16.57.05[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '165630'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/19/19.24.56-19.25.33[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '192456'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/19/19.51.13-19.52.00[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '195113'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/19/19.52.37-19.53.10[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '195237'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.05.29-20.06.02[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '200529'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.26.44-20.27.38[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '202644'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.35.20-20.35.41[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '203520'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.38.57-20.39.17[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '203857'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.40.49-20.41.11[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '204049'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.44.27-20.44.47[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '204427'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.49.09-20.49.46[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '204909'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/20/20.51.09-20.51.58[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '205109'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/22/22.33.25-22.33.46[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '223325'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/22/22.38.48-22.39.10[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '223848'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/22/22.50.14-22.50.35[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '225014'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/23/23.04.43-23.05.03[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '230443'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/23/23.08.18-23.08.40[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '230818'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/23/23.19.51-23.20.11[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '231951'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/23/23.23.27-23.23.48[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '232327'


  


  `
If I remove the comment and do the ffmpeg thing it fails for some files because $fullpath is wrong :

  


  $cat flist.txt
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/00/00.01.33-00.01.55[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '000133'
fullpath 'media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/00/00.29.26-00.29.48[M][0@0][0].dav'
lenght  118
basedate '20220611'
basetime '002926'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/00/00.33.09-00.33.32[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '003309'
fullpath 'media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/02/02.23.35-02.23.56[M][0@0][0].dav'
lenght  118
basedate '20220611'
basetime '022335'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/02/02.27.19-02.27.40[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '022719'
fullpath 'media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/04/04.08.22-04.08.43[M][0@0][0].dav'
lenght  118
basedate '20220611'
basetime '040822'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/06/06.50.14-06.50.40[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '065014'
fullpath 'media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/06/06.50.43-06.51.28[M][0@0][0].dav'
lenght  118
basedate '20220611'
basetime '065043'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/06/06.56.56-06.58.02[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '065656'
fullpath 'edia/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/09/09.18.31-09.19.09[M][0@0][0].dav'
lenght  117
basedate '20220611'
basetime '091831'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/09/09.47.54-09.55.00[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '094754'
fullpath '1/dav/09/09.55.00-09.55.50[M][0@0][0].dav'
lenght  41
basedate '][0@][].'
basetime '095500'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/10/10.20.23-10.20.44[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '102023'
fullpath 'media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/10/10.24.24-10.24.44[M][0@0][0].dav'
lenght  118
basedate '20220611'
basetime '102424'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/11/11.00.39-11.01.34[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '110039'
fullpath 'edia/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/13/13.26.22-13.26.53[M][0@0][0].dav'
lenght  117
basedate '20220611'
basetime '132622'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.00.09-16.01.04[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '160009'
fullpath 'dia/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.38.46-16.39.15[M][0@0][0].dav'
lenght  116
basedate '20220611'
basetime '163846'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.56.05-16.56.30[M][0@0][0].dav'
lenght  119
basedate '20220611'
basetime '165605'
fullpath 'media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/16/16.56.30-16.57.05[M][0@0][0].dav'
lenght  118
basedate '20220611'
basetime '165630'
fullpath '/media/mark/d1d75ed6-f3a5-433b-9090-d95191275f6c/download/camera/2022-06-11/001/dav/19/19.24.56-19.25.33[M][0@0][0].dav'
lenght  119
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  So why does it fail when ffmpeg is not commented out ?

  


  Follow-up : found this post

  


  https://unix.stackexchange.com/questions/241535/problem-with-ffmpeg-in-bash-loop

  


  I think this relates to my problem but I don't know how to change my code accordingly.

  


  Edit2, I think I found the solution

  


  ffmpeg -y -i $fullpath -c:v copy -movflags +faststart $newfilename < /dev/null &> /dev/null;