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
3 回答
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 .
看起来像MPEG-TS支持AES3格式的PCM音频作为私有数据，由SMPTE 302M指定 .
目前ffmpeg中有一个
s302m编码器/解码器，可以让您轻松实现目标 .前段时间我也玩过它 . 而我发现的是： - 蓝光仅支持48000采样率 - 我总是使用BIG ENDIAN而不是LITTLE ENDIAN .
我认为ffmpeg将为mpeg2_ts使用蓝光设置 .