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  • libavcodec : ffprobe on file encoded with FFV1 codec reports "read_quant_table error"

    20 novembre 2016, par Ali Alidoust

    I’m using the following code to encode a series of frames into an mkv or avi file with FFV1 encoding :

       HRESULT Session::createContext(LPCSTR filename, UINT width, UINT height, UINT fps_num, UINT fps_den) {
    
    LOG("Exporting to file: ", filename);
    

    
    AVCodecID codecId = AV_CODEC_ID_FFV1;
    
    this->pixelFormat = AV_PIX_FMT_YUV420P;
    

    
    this->codec = avcodec_find_encoder(codecId);
    
    RET_IF_NULL(this->codec, "Could not create codec", E_FAIL);
    

    
    this->oformat = av_guess_format(NULL, filename, NULL);
    
    RET_IF_NULL(this->oformat, "Could not create format", E_FAIL);
    
    this->oformat->video_codec = codecId;
    
    this->width = width;
    
    this->height = height;
    
    this->codecContext = avcodec_alloc_context3(this->codec);
    
    RET_IF_NULL(this->codecContext, "Could not allocate context for the codec", E_FAIL);
    

    
    this->codecContext->codec = this->codec;
    
    this->codecContext->codec_id = codecId;
    

    
    this->codecContext->pix_fmt = pixelFormat;
    
    this->codecContext->width = this->width;
    
    this->codecContext->height = this->height;
    
    this->codecContext->time_base.num = fps_den;
    
    this->codecContext->time_base.den = fps_num;
    

    
    this->codecContext->gop_size = 1;
    

    

    
    RET_IF_FAILED_AV(avformat_alloc_output_context2(&fmtContext, this->oformat, NULL, NULL), "Could not allocate format context", E_FAIL);
    
    RET_IF_NULL(this->fmtContext, "Could not allocate format context", E_FAIL);
    

    
    this->fmtContext->oformat = this->oformat;
    
    this->fmtContext->video_codec_id = codecId;
    

    
    this->stream = avformat_new_stream(this->fmtContext, this->codec);
    
    RET_IF_NULL(this->stream, "Could not create new stream", E_FAIL);
    
    this->stream->time_base = this->codecContext->time_base;
    
    RET_IF_FAILED_AV(avcodec_parameters_from_context(this->stream->codecpar, this->codecContext), "Could not convert AVCodecContext to AVParameters", E_FAIL);
    

    
    if (this->fmtContext->oformat->flags & AVFMT_GLOBALHEADER)
    
    {
    
        this->codecContext->flags |= CODEC_FLAG_GLOBAL_HEADER;
    
    }
    

    
    av_opt_set_int(this->codecContext->priv_data, "coder", 0, 0);
    
    av_opt_set_int(this->codecContext->priv_data, "context", 1, 0);
    
    av_opt_set_int(this->codecContext->priv_data, "slicecrc", 1, 0);
    
    //av_opt_set_int(this->codecContext->priv_data, "slicecrc", 1, 0);
    
    //av_opt_set_int(this->codecContext->priv_data, "pix_fmt", pixelFormat, 0);
    

    
    RET_IF_FAILED_AV(avcodec_open2(this->codecContext, this->codec, NULL), "Could not open codec", E_FAIL);
    
    RET_IF_FAILED_AV(avio_open(&this->fmtContext->pb, filename, AVIO_FLAG_WRITE), "Could not open output file", E_FAIL);
    
    RET_IF_NULL(this->fmtContext->pb, "Could not open output file", E_FAIL);
    
    RET_IF_FAILED_AV(avformat_write_header(this->fmtContext, NULL), "Could not write header", E_FAIL);
    

    
    frame = av_frame_alloc();
    
    RET_IF_NULL(frame, "Could not allocate frame", E_FAIL);
    
    frame->format = this->codecContext->pix_fmt;
    
    frame->width = width;
    
    frame->height = height;
    
    return S_OK;
    
}
    

    
HRESULT Session::writeFrame(IMFSample * pSample) {
    
    IMFMediaBuffer *mediaBuffer = NULL;
    
    BYTE *pDataNV12 = NULL;
    
    DWORD length;
    

    
    RET_IF_FAILED(pSample->ConvertToContiguousBuffer(&mediaBuffer), "Could not convert IMFSample to contagiuous buffer", E_FAIL);
    
    RET_IF_FAILED(mediaBuffer->GetCurrentLength(&length), "Could not get buffer length", E_FAIL);
    
    RET_IF_FAILED(mediaBuffer->Lock(&pDataNV12, NULL, NULL), "Could not lock the buffer", E_FAIL);
    
    BYTE *pDataYUV420P = new BYTE[length];
    
    this->convertNV12toYUV420P(pDataNV12, pDataYUV420P, this->width, this->height);
    
    RET_IF_FAILED(av_image_fill_arrays(frame->data, frame->linesize, pDataYUV420P, pixelFormat, this->width, this->height, 1), "Could not fill the frame with data from the buffer", E_FAIL);
    
    LOG_IF_FAILED(mediaBuffer->Unlock(), "Could not unlock the buffer");
    

    
    frame->pts = av_rescale_q(this->pts++, this->codecContext->time_base, this->stream->time_base);
    

    
    AVPacket pkt;
    

    
    av_init_packet(&pkt);
    
    pkt.data = NULL;
    
    pkt.size = 0;
    

    
    RET_IF_FAILED_AV(avcodec_send_frame(this->codecContext, frame), "Could not send the frame to the encoder", E_FAIL);
    
    delete[] pDataYUV420P;
    
    if (SUCCEEDED(avcodec_receive_packet(this->codecContext, &pkt))) {
    
        RET_IF_FAILED_AV(av_interleaved_write_frame(this->fmtContext, &pkt), "Could not write the received packet.", E_FAIL);
    
    }
    

    
    av_packet_unref(&pkt);
    

    
    return S_OK;
    
}
    

    
HRESULT Session::endSession() {
    
    LOG("Ending session...");
    

    
    LOG("Closing files...")
    
    LOG_IF_FAILED_AV(av_write_trailer(this->fmtContext), "Could not finalize the output file.");
    
    LOG_IF_FAILED_AV(avio_close(this->fmtContext->pb), "Could not close the output file.");
    
    LOG_IF_FAILED_AV(avcodec_close(this->codecContext), "Could not close the codec.");
    
    av_free(this->codecContext);
    
    LOG("Done.")
    
    return S_OK;
    
}

    The problem is that the generated file is not playable in either VLC or MPC-HC. However, MPC-HC reports following info in file properties :

    General
    
Unique ID                      : 202978442142665779317960161865934977227 (0x98B439D9BE859109BD5EC00A62A238CB)
    
Complete name                  : T:\Test.mkv
    
Format                         : Matroska
    
Format version                 : Version 4 / Version 2
    
File size                      : 24.6 MiB
    
Duration                       : 147ms
    
Overall bit rate               : 1 401 Mbps
    
Writing application            : Lavf57.57.100
    
Writing library                : Lavf57.57.100
    

    
Video
    
ID                             : 1
    
Format                         : FFV1
    
Format version                 : Version 0
    
Codec ID                       : V_MS/VFW/FOURCC / FFV1
    
Duration                       : 147ms
    
Width                          : 1 280 pixels
    
Height                         : 720 pixels
    
Display aspect ratio           : 16:9
    
Frame rate mode                : Constant
    
Frame rate                     : 1 000.000 fps
    
Color space                    : YUV
    
Chroma subsampling             : 4:2:0
    
Bit depth                      : 8 bits
    
Compression mode               : Lossless
    
Default                        : Yes
    
Forced                         : No
    
DURATION                       : 00:00:00.147000000
    
coder_type                     : Golomb Rice

    Something to note is that it reports 1000 FPS which is weird since I’ve set AVCodecContext::time_base in the code.

    UPDATE 1 :

    I managed to set the correct fps by setting time_base property of the stream :

    this->stream->time_base.den = fps_num;
    
this->stream->time_base.num = fps_den;

    VLC plays the output file but it shows VLC logo instead of the video, as if there is no video stream in the file.

    UPDATE 2 :

    Cleaned up the code. Now if I set codecId = AV_CODEC_ID_MPEG2VIDEO the output file is valid and is played in both VLC and MPC-HC. Using ffprobe on the file with FFV1 encoding yields the following result :

    C:\root\apps\ffmpeg>ffprobe.exe t:\test.avi
    
ffprobe version 3.2 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 5.4.0 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.100 / 57. 64.100
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
[ffv1 @ 00000000006b83a0] read_quant_table error
    
Input #0, avi, from 't:\test.avi':
    
  Metadata:
    
    encoder         : Lavf57.56.100
    
  Duration: 00:00:04.94, start: 0.000000, bitrate: 107005 kb/s
    
    Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 1280x720, 107717 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc

  • FFmpeg - Concat videos with different time base

    21 janvier 2017, par Xys

    I’m trying to concat videos with the concat demuxer, but it does not work when using one video ("video2.mp4" below). By does not work, I mean playing the concatenated video on a player will work until the second video part starts (it just cannot read the video anymore). It works with the concat filter though. They are both mp4 videos, so I think it’s because of the time base ? I can concat other videos with the concat demuxer and it works fine (even with different resolutions/bitrate). It only happens when trying to concat "video2.mp4".

    Also, I have a lot of warning/errors like this, probably when ffmpeg starts concatenating the 2nd video :

    [mp4 @ 0x7f847a814800] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 302359; changing to 906907. This may result in incorrect timestamps in the output file.

    What would be the best way to have a minimum concat time ? Do I really need to use the concat filter or can I change the time base of "video1.mp4" if it’s really the problem ?

    Any help would be appreciated, thanks !

    Video 1 :

    ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    creation_time   : 2016-08-17T22:50:35.000000Z
    
  Duration: 00:00:10.11, start: 0.000000, bitrate: 38018 kb/s
    
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    
    Metadata:
    
      creation_time   : 2016-08-18T00:02:24.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    
    Metadata:
    
      creation_time   : 2016-08-18T00:02:24.000000Z
    
      handler_name    : SoundHandle

    Video 2 :

    ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2017-01-06T22:30:23.000000Z
    
  Duration: 00:00:08.19, start: 0.000000, bitrate: 101474 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 4096x2048 [SAR 1:1 DAR 2:1], 101549 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    
    Metadata:
    
      creation_time   : 2017-01-06T22:30:23.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : AVC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
    
    Metadata:
    
      creation_time   : 2017-01-06T22:30:23.000000Z
    
      handler_name    : #Mainconcept MP4 Sound Media Handler

    FFMpeg Command :

    ffmpeg -f concat -safe 0 -i concat.txt -c copy result.mp4

    concat.txt :

    file '/path/to/video1.mp4'
    
file '/path/to/video2.mp4'

    Command result :

    ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8b808c00] Auto-inserting h264_mp4toannexb bitstream filter
    
Input #0, concat, from 'concat.txt':
    
  Duration: N/A, start: 0.000000, bitrate: 38021 kb/s
    
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc
    
    Metadata:
    
      creation_time   : 2016-08-18T00:02:24.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
    
    Metadata:
    
      creation_time   : 2016-08-18T00:02:24.000000Z
    
      handler_name    : SoundHandle
    
Output #0, mp4, to 'result.mp4':
    
  Metadata:
    
    encoder         : Lavf57.56.100
    
    Stream #0:0(eng): Video: h264 (Baseline) ([33][0][0][0] / 0x0021), yuv420p, 1696x848, q=2-31, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      creation_time   : 2016-08-18T00:02:24.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 189 kb/s
    
    Metadata:
    
      creation_time   : 2016-08-18T00:02:24.000000Z
    
      handler_name    : SoundHandle
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy) 
    
Press [q] to stop, [?] for help
    
frame=  112 fps=0.0 q=-1.0 size=   12701kB time=00:00:03.70 bitrate=28092.2kbits/s speed= 7.4x
    
frame=  151 fps=151 q=-1.0 size=   18853kB time=00:00:05.00 bitrate=30857.5kbits/s speed=   5x
    
frame=  224 fps=149 q=-1.0 size=   30042kB time=00:00:07.44 bitrate=33074.8kbits/s speed=4.95x
    
frame=  268 fps=134 q=-1.0 size=   36596kB time=00:00:08.90 bitrate=33650.8kbits/s speed=4.44x
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8a808000] Auto-inserting h264_mp4toannexb bitstream filter.9x 
    
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484352, current: 445939; changing to 484353. This may result in incorrect timestamps in the output file.
    
[concat @ 0xb545c400] DTS 304057 < 906906 out of order
    
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 304057; changing to 906907. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484353, current: 446963; changing to 484354. This may result in incorrect timestamps in the output file.
    
...
    
... like 100 DTS errors ...
    
...
    
[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 907150, current: 548301; changing to 907151. This may result in incorrect timestamps in the output file.
    
frame=  548 fps=169 q=-1.0 Lsize=  148399kB time=00:00:18.28 bitrate=66493.7kbits/s speed=5.64x
    
video:148027kB audio:359kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.008622%

    Thank you in advance !

  • How to create in Infinite Live Stream on Youtube ?

    20 mai 2017, par Quin Tosch

    I wanted to know how to make an Infinite Live stream on Youtube with ffmpeg like this one : https://www.youtube.com/watch?v=H7q9MxktwlY (The stream ended a few weeks ago)

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