我正在尝试使用FMPEG.mpeg将视频(H.264)和音频(PCM_S16LE,无压缩)多路复用成MPEG传输流。视频显示正常。但是,音频流不会播放。ffprobe显示的音频流是AAC,这显然不是我的本意。所以我一定是在添加音频流的时候做错了什么。你知道我该怎么纠正这个问题吗?
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);
}
}下面是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发布于 2012-04-09 17:17:13
我想我怀疑MEPG2 TS是否会允许PCM音频。它可以占用MPI、MP2或AAC。AAC更多地被视为一种默认选择,而不是身份识别。
此外,与视频不同的是,音频标头不是很有区分性。也就是说,没有起始码和东西,所以除了PES头,通常没有办法找出它是什么类型的音频。
如果可能,对音频进行编码。
尝试使用Gspot应用程序进行交叉检查。
发布于 2017-12-12 12:08:58
看起来像是MPEG-TS支持SMPTE 302M指定的私有数据格式的PCM音频。
目前在ffmpeg中有一个s302m编码器/解码器,可以让你轻松实现你的目标。
发布于 2017-01-18 21:28:44
前段时间我也玩过它。我发现:-蓝光只支持48000采样率-我总是使用大端而不是小端。
我认为ffmpeg将在mpeg2_ts上使用蓝光设置。
https://stackoverflow.com/questions/10051250
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