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    4 février 2011, par

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Sur d’autres sites (4635)

  • How parse and decode H264 file with libav/ffmpeg ?

    12 août 2022, par isrepeat

    According to official documentations I try decode my test.mp4 with AV_CODEC_ID_H264.

    


    Of course I can do this with av_read_frame(), but how do it with av_parser_parse2() ?

    


    The problem occurs at avcodec_send_packet(...) at decode_nal_units(...) at ff_h2645_packet_split(...) [h264dec.c]

    


    extern "C" {&#xA;#include <libavcodec></libavcodec>avcodec.h>&#xA;#include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;//#define INBUF_SIZE 4096&#xA;#define INBUF_SIZE 256000&#xA;&#xA;void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt, const char* filename);&#xA;&#xA;int main(int argc, char** argv)&#xA;{&#xA;    const char* filename;&#xA;    const AVCodec* codec;&#xA;    AVFormatContext* formatCtx = NULL;&#xA;    AVCodecParserContext* parser;&#xA;    AVCodecContext* c = NULL;&#xA;    AVStream* videoStream = NULL;&#xA;    FILE* f;&#xA;    AVFrame* frame;&#xA;    uint8_t inbuf[INBUF_SIZE &#x2B; AV_INPUT_BUFFER_PADDING_SIZE];&#xA;    uint8_t* data;&#xA;    size_t   data_size;&#xA;    int ret;&#xA;    AVPacket* pkt;&#xA;&#xA;    filename = "D:\\test.mp4";&#xA;&#xA;    //if (avformat_open_input(&amp;formatCtx, filename, nullptr, nullptr) &lt; 0) {&#xA;    //    throw std::exception("Could not open source file");&#xA;    //}&#xA;&#xA;    //if (avformat_find_stream_info(formatCtx, nullptr) &lt; 0) {&#xA;    //    throw std::exception("Could not find stream information");&#xA;    //}&#xA;&#xA;    //videoStream = formatCtx->streams[0];&#xA;&#xA;&#xA;&#xA;    pkt = av_packet_alloc();&#xA;    if (!pkt)&#xA;        exit(1);&#xA;&#xA;    /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */&#xA;    memset(inbuf &#x2B; INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);&#xA;&#xA;    /* find the MPEG-1 video decoder */&#xA;    //codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);&#xA;    codec = avcodec_find_decoder(AV_CODEC_ID_H264);&#xA;    if (!codec) {&#xA;        fprintf(stderr, "Codec not found\n");&#xA;        exit(1);&#xA;    }&#xA;&#xA;    parser = av_parser_init(codec->id);&#xA;    if (!parser) {&#xA;        fprintf(stderr, "parser not found\n");&#xA;        exit(1);&#xA;    }&#xA;&#xA;    parser->flags = PARSER_FLAG_COMPLETE_FRAMES;&#xA;&#xA;    c = avcodec_alloc_context3(codec);&#xA;    if (!c) {&#xA;        fprintf(stderr, "Could not allocate video codec context\n");&#xA;        exit(1);&#xA;    }&#xA;&#xA;    /* For some codecs, such as msmpeg4 and mpeg4, width and height&#xA;       MUST be initialized there because this information is not&#xA;       available in the bitstream. */&#xA;&#xA;    //avcodec_parameters_to_context(c, videoStream->codecpar);&#xA;&#xA;       /* open it */&#xA;    if (avcodec_open2(c, codec, NULL) &lt; 0) {&#xA;        fprintf(stderr, "Could not open codec\n");&#xA;        exit(1);&#xA;    }&#xA;&#xA;    f = fopen(filename, "rb");&#xA;    if (!f) {&#xA;        fprintf(stderr, "Could not open %s\n", filename);&#xA;        exit(1);&#xA;    }&#xA;&#xA;    frame = av_frame_alloc();&#xA;    if (!frame) {&#xA;        fprintf(stderr, "Could not allocate video frame\n");&#xA;        exit(1);&#xA;    }&#xA;&#xA;    // ---- Use parser to get packets ----&#xA;    while (!feof(f)) {&#xA;        /* read raw data from the input file */&#xA;        data_size = fread(inbuf, 1, INBUF_SIZE, f);&#xA;        if (!data_size)&#xA;            break;&#xA;&#xA;        /* use the parser to split the data into frames */&#xA;        data = inbuf;&#xA;        while (data_size > 0) {&#xA;            ret = av_parser_parse2(parser, c, &amp;pkt->data, &amp;pkt->size, data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);&#xA;            if (ret &lt; 0) {&#xA;                fprintf(stderr, "Error while parsing\n");&#xA;                exit(1);&#xA;            }&#xA;            data &#x2B;= ret;&#xA;            data_size -= ret;&#xA;&#xA;            if (pkt->size)&#xA;                decode(c, frame, pkt, outfilename);&#xA;        }&#xA;    }&#xA;&#xA;    // ---- Use FormatContext to get packets ----&#xA;    //  while (av_read_frame(fmt_ctx, pkt) == 0)&#xA;    //  {&#xA;    //      if (pkt->stream_index == AVMEDIA_TYPE_VIDEO) {&#xA;    //          if (pkt->size > 0)&#xA;    //              decode(cdc_ctx, frame, pkt, fp_out);&#xA;    //      }&#xA;    //  }&#xA;&#xA;    /* flush the decoder */&#xA;    decode(c, frame, NULL, outfilename);&#xA;&#xA;    fclose(f);&#xA;&#xA;    av_parser_close(parser);&#xA;    avcodec_free_context(&amp;c);&#xA;    av_frame_free(&amp;frame);&#xA;    av_packet_free(&amp;pkt);&#xA;&#xA;    return 0;&#xA;}&#xA;&#xA;void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt, const char* filename)&#xA;{&#xA;    char buf[1024];&#xA;    int ret;&#xA;&#xA;    ret = avcodec_send_packet(dec_ctx, pkt);&#xA;    if (ret &lt; 0) {&#xA;        char buff[255]{ 0 };&#xA;        std::string strError = av_make_error_string(buff, 255, ret);&#xA;        fprintf(stderr, "Error sending a packet for decoding\n");&#xA;        exit(1);&#xA;    }&#xA;&#xA;    while (ret >= 0) {&#xA;        ret = avcodec_receive_frame(dec_ctx, frame);&#xA;        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)&#xA;            return;&#xA;        else if (ret &lt; 0) {&#xA;            fprintf(stderr, "Error during decoding\n");&#xA;            exit(1);&#xA;        }&#xA;&#xA;        printf("saving frame %3d\n", dec_ctx->frame_number);&#xA;        fflush(stdout);&#xA;        /* the picture is allocated by the decoder. no need to&#xA;           free it */&#xA;        // handle frame ...&#xA;    }&#xA;}&#xA;

    &#xA;

  • ffmpeg hls video recording timing information is inaccurate

    28 juin 2018, par Haris

    I am recording the rtsp stream in HLS format which is working fine with below command.

    ~/bin/ffmpeg -i rtsp://10.0.7.39:554/media/live/1/1 -c:a aac -c:v copy -hls_list_size 65535 -hls_time 2 live.m3u8

    But when I check the duration of each ts file with live.m3u8 file content the value is not accurate.

    Here is the live.m3u8

    #EXTM3U
    #EXT-X-VERSION:3
    #EXT-X-TARGETDURATION:2
    #EXT-X-MEDIA-SEQUENCE:0
    #EXTINF:2.000000,
    live0.ts
    #EXTINF:2.000000,
    live1.ts
    #EXTINF:1.200000,
    live2.ts
    #EXTINF:2.500000,
    live3.ts
    #EXTINF:2.000000,
    live4.ts
    #EXTINF:2.600000,
    live5.ts
    #EXTINF:1.700000,
    live6.ts
    #EXT-X-ENDLIST

    And when I check the timing information of the ts file live2.ts using the command,

     ~/bin/ffprobe -i live2.ts -show_entries format=duration -v quiet -of csv="p=0"

    I am getting the value 2.136000 where as in m3u8 file it is 1.20000.

    I have build the latest FFMPEG based on official guild https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu.

    OS : Ubuntu 12.04

    ffmpeg Version

    $~/bin//ffmpeg -version


    ffmpeg version N-91369-g4ac88ba Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 4.8 (Ubuntu 4.8.1-2ubuntu1~12.04)
    configuration: --prefix=/home/haris/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/haris/ffmpeg_build/include --extra-ldflags=-L/home/haris/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/haris/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
    libavutil      56. 18.102 / 56. 18.102
    libavcodec     58. 20.104 / 58. 20.104
    libavformat    58. 17.101 / 58. 17.101
    libavdevice    58.  4.101 / 58.  4.101
    libavfilter     7. 25.100 /  7. 25.100
    libswscale      5.  2.100 /  5.  2.100
    libswresample   3.  2.100 /  3.  2.100
    libpostproc    55.  2.100 / 55.  2.100

    Note

    If I tested the same command in Ubuntu 16.04 where ffmpeg installed with apt-get every thing works fine.

    Here is the ffmpeg details

    $ ~/bin/ffmpeg -version
    ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    libavutil      54. 31.100 / 54. 31.100
    libavcodec     56. 60.100 / 56. 60.100
    libavformat    56. 40.101 / 56. 40.101
    libavdevice    56.  4.100 / 56.  4.100
    libavfilter     5. 40.101 /  5. 40.101
    libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
    libswresample   1.  2.101 /  1.  2.101
    libpostproc    53.  3.100 / 53.  3.100

    What could be the cause, any help will be appreciated.

  • ffmpeg hls video recording timing inforamtion is inaccurate

    27 juin 2018, par Haris

    I am recording the rtsp stream in HLS format which is working fine with below command.

    ~/bin/ffmpeg -i rtsp://10.0.7.39:554/media/live/1/1 -c:a aac -c:v copy -hls_list_size 65535 -hls_time 2 live.m3u8

    But when I check the the duration of each ts file with live.m3u8 file content the value is not accurate.

    Here is the live.m3u8

    #EXTM3U
    #EXT-X-VERSION:3
    #EXT-X-TARGETDURATION:2
    #EXT-X-MEDIA-SEQUENCE:0
    #EXTINF:2.000000,
    live0.ts
    #EXTINF:2.000000,
    live1.ts
    #EXTINF:1.200000,
    live2.ts
    #EXTINF:2.500000,
    live3.ts
    #EXTINF:2.000000,
    live4.ts
    #EXTINF:2.600000,
    live5.ts
    #EXTINF:1.700000,
    live6.ts
    #EXT-X-ENDLIST

    And when I check the timing information of the ts file live2.ts using the command,

     ~/bin/ffprobe -i live2.ts -show_entries format=duration -v quiet -of csv="p=0"

    I am getting the value 2.136000 where as in m3u8 file it is 1.20000.

    I have build the latest FFMPEG based on official guild https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu.

    OS : Ubuntu 12.04

    ffmpeg Version

    $~/bin//ffmpeg -version


    ffmpeg version N-91369-g4ac88ba Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 4.8 (Ubuntu 4.8.1-2ubuntu1~12.04)
    configuration: --prefix=/home/haris/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/haris/ffmpeg_build/include --extra-ldflags=-L/home/haris/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/haris/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
    libavutil      56. 18.102 / 56. 18.102
    libavcodec     58. 20.104 / 58. 20.104
    libavformat    58. 17.101 / 58. 17.101
    libavdevice    58.  4.101 / 58.  4.101
    libavfilter     7. 25.100 /  7. 25.100
    libswscale      5.  2.100 /  5.  2.100
    libswresample   3.  2.100 /  3.  2.100
    libpostproc    55.  2.100 / 55.  2.100

    Note

    If I tested the same command in Ubuntu 16.04 where ffmpeg installed with apt-get every thing works fine.

    Here is the ffmpeg details

    $ ~/bin/ffmpeg -version
    ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    libavutil      54. 31.100 / 54. 31.100
    libavcodec     56. 60.100 / 56. 60.100
    libavformat    56. 40.101 / 56. 40.101
    libavdevice    56.  4.100 / 56.  4.100
    libavfilter     5. 40.101 /  5. 40.101
    libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
    libswresample   1.  2.101 /  1.  2.101
    libpostproc    53.  3.100 / 53.  3.100

    What could be the cause, any help will be appreciated.