多路复用到MPEG-TS：音频流的错误参数

2023年10月22日 267次阅读

我正在尝试使用ffmpeg将视频(H.264)和音频(PCM_S16LE,无压缩)复用到MPEG传输流中.视频显示很好.但是,音频流不播放. ffprobe显示的音频流是AAC,这显然不是我的意图.所以我必须在添加音频流时做错事.知道怎么纠正这个吗？

这是我添加音频流的代码：

void add_audio_stream()
{

    CodecID codec_id = CODEC_ID_PCM_S16LE;

    AVStream *p_ast = av_new_stream(fc, 1);

    if (!p_ast) {
        fprintf(stderr, "Could not alloc audio stream\n");
        exit(1);
    }

    ai = p_ast->index;

    AVCodecContext *pcc = p_ast->codec;
    avcodec_get_context_defaults2( pcc, AVMEDIA_TYPE_AUDIO );

    pcc->codec_type = AVMEDIA_TYPE_AUDIO;
    pcc->codec_id = codec_id;
    pcc->sample_fmt = AV_SAMPLE_FMT_S16;
    //pcc->bit_rate = 44100*16*2;
    pcc->bit_rate = 0;
    pcc->sample_rate = 44100;
    pcc->channels = 2;
    pcc->time_base = (AVRational){1, 44100};


    // some formats want stream headers to be separate
    if (fc->oformat->flags & AVFMT_GLOBALHEADER)
    {
        printf(" **** 1 ****\n");
        pcc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    }
    else
        printf(" **** 2 ****\n");


    AVCodec *codec;

    /* find the audio encoder */
    codec = avcodec_find_encoder(pcc->codec_id);
    if (!codec) {
        fprintf(stderr, "codec not found\n");
        exit(1);
    }


    /* open it */
    if (avcodec_open(pcc, codec) < 0) 
    {
        fprintf(stderr, "could not open codec\n");
        exit(1);
    }
}

这是ffprobe的输出：

ffprobe version N-32405-g6337de9, Copyright (c) 2007-2011 the FFmpeg developers
  built on Sep  8 2011 11:20:12 with gcc 4.4.3
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-x11grab --enable-libmp3lame
  libavutil    51. 16. 0 / 51. 16. 0
  libavcodec   53. 13. 0 / 53. 13. 0
  libavformat  53. 12. 0 / 53. 12. 0
  libavdevice  53.  3. 0 / 53.  3. 0
  libavfilter   2. 39. 0 /  2. 39. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[mpegts @ 0xa96daa0] Continuity Check Failed
[mpegts @ 0xa96daa0] Continuity Check Failed
[aac @ 0xa974da0] channel element 0.1 is not allocated
[aac @ 0xa974da0] More than one AAC RDB per ADTS frame is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

.
.
lot of gobbly-gook about missing AAC parameters . . . 
.
.

[aac @ 0xa974da0] More than one AAC RDB per ADTS frame is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[aac @ 0xa974da0] Error decoding AAC frame header.
[mpegts @ 0xa96daa0] max_analyze_duration 5000000 reached at 5429789
[mpegts @ 0xa96daa0] Continuity Check Failed
[mpegts @ 0xa96daa0] Continuity Check Failed

Input #0, mpegts, from 'test_audio_video.mts':
  Duration: 00:00:40.35, start: 0.010000, bitrate: 1907 kb/s
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
Stream #0.0[0x100]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 640x480, 30 fps, 30 tbr, 90k tbn, 60 tbc

Stream #0.1[0x101]: Audio: aac ([6][0][0][0] / 0x0006), 96000 Hz, 4.0, s16, 9 kb/s

最佳答案 我想我怀疑MEPG2 TS会允许PCM音频.它可以占用MPI,MP2或AAC. AAC被视为默认选择而不是识别.

此外,与视频不同,音频标头不是非常具有说服力.即没有起始码和东西,所以除了PES头之外,通常无法找出它是什么类型的音频.

尽可能编码音频.

尝试使用Gspot应用程序进行交叉检查.

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