使用FFmpeg将文件转为ts

转载http://blog.chinaunix.net/uid-11344913-id-4432752.html

使用ffmpeg将mp4转为ts的命令格式如下：

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ffmpeg-i b.mp4-codec
 copy-bsfh264_mp4toannexb a.ts

如果不使用-bsf h264_mp4toannexb参数，会提示错误，错误信息如下：

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ffmpeg-i b.mp4-codec
 copy a.ts

ffmpeg version N-65108-gf2855eb Copyright(c)2000-2014
 the FFmpeg developers

built on Jul 31 2014 02:29:27 with gcc 4.4.7(GCC)20120313(Red
 Hat 4.4.7-4)

configuration:--prefix=/usr/local--enable-gpl--enable-nonfree--enable-libfaac--enable-libfreetype--enable-libx264--enable-libx265

libavutil 52.93.100 / 52.93.100

libavcodec 55.71.100 / 55.71.100

libavformat 55.49.100 / 55.49.100

libavdevice 55.13.102 / 55.13.102

libavfilter 4.11.102 / 4.11.102

libswscale 2.6.100 / 2.6.100

libswresample 0.19.100 / 0.19.100

libpostproc 52.3.100 / 52.3.100

Input #0,mov,mp4,m4a,3gp,3g2,mj2,from'b.mp4':

Metadata:

major_brand:isom

minor_version:512

compatible_brands:isomiso2avc1mp41

title:????????

encoder:Lavf55.49.100

copyright:(C)2004 HFD2B

Duration:00:04:09.44,start:0.000000,bitrate:568
 kb/s

Stream #0:0(und):Video:h264(High)(avc1
 / 0x31637661),yuv420p,592x336,436
 kb/s,23.98 fps,23.98
 tbr,785647.00 tbn,47.95
 tbc(default)

Metadata:

handler_name:VideoHandler

Stream #0:1(und):Audio:aac(mp4a
 / 0x6134706D),44100 Hz,stereo,fltp,127
 kb/s(default)

Metadata:

handler_name:SoundHandler

File'a.ts'already exists.Overwrite?[y/N]y

[adts @ 0x2269660]Using AVStream.codec.time_base
 as a timebase hint to the muxer is deprecated.Set AVStream.time_base instead.

Output #0,mpegts,to'a.ts':

Metadata:

major_brand:isom

minor_version:512

compatible_brands:isomiso2avc1mp41

title:????????

copyright:(C)2004 HFD2B

encoder:Lavf55.49.100

Stream #0:0(und):Video:h264(avc1
 / 0x31637661),yuv420p,592x336,q=2-31,436
 kb/s,23.98 fps,90k tbn,23.98
 tbc(default)

Metadata:

handler_name:VideoHandler

Stream #0:1(und):Audio:aac(mp4a
 / 0x6134706D),44100 Hz,stereo,127
 kb/s(default)

Metadata:

handler_name:SoundHandler

Stream mapping:

Stream #0:0->#0:0(copy)

Stream #0:1->#0:1(copy)

Press[q]to stop,[?]forhelp

[mpegts @ 0x22761a0]H.264 bitstream malformed,no
 startcode found,use the h264_mp4toannexb bitstream filter(-bsfh264_mp4toannexb)

av_interleaved_write_frame():Invalid argument

frame=1 fps=0.0 q=-1.0
 Lsize=1kB time=00:00:00.04
 bitrate=216.3kbits/s

video:1kB audio:0kB subtitle:0kB other streams:0kB
 global headers:0kB muxing overhead:unknown

Conversion

从上面的提示纤细可以看到，提示了：
[mpegts @ 0x22761a0] H.264 bitstream malformed, no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)
av_interleaved_write_frame(): Invalid argument
主要是因为使用了mp4中的h264编码，而h264有两种封装：
一种是annexb模式，传统模式，有startcode，SPS和PPS是在ES中；另一种是mp4模式，一般mp4、mkv、avi会没有startcode，SPS和PPS以及其它信息被封装在container中，每一个frame前面是这个frame的长度，很多解码器只支持annexb这种模式，因此需要将mp4做转换；在ffmpeg中用h264_mp4toannexb_filter可以做转换；所以需要使用-bsf h264_mp4toannexb来进行转换；

下面介绍一下代码实现：
代码实现主要分为三个步骤：

点击(此处)折叠或打开

初始化filterav_bitstream_filter_init

使用filter转换av_bitstream_filter_filter

关闭filter av_bitstream_filter_close

其他与正常的转封装相同

点击(此处)折叠或打开

#include<stdio.h>

#include<stdlib.h>

#include<libavformat/avformat.h>

#include<libavutil/avutil.h>

#define FORMAT"mpegts"

#define OUTPUT_FILE"./fuck.ts"

#define INPUT_FILE"./a.avi"

intmain(intargc,char*argv[])

{

AVPacket pkt;

AVFormatContext*input_fmtctx=NULL;

AVFormatContext*output_fmtctx=NULL;

AVCodecContext*enc_ctx=NULL;

AVCodecContext*dec_ctx=NULL;

AVCodec*encoder=NULL;

AVBitStreamFilterContext*vbsf=NULL;

intret=0;

inti=0;

inthave_key=0;

staticintfirst_pkt=1;

av_register_all();

if(avformat_open_input(&input_fmtctx,INPUT_FILE,NULL,NULL)<0){

av_log(NULL,AV_LOG_ERROR,"Cannot
 open the file %s\n","./a.mp4");

return-ENOENT;

}

if(avformat_find_stream_info(input_fmtctx,0)<0){

av_log(NULL,AV_LOG_ERROR,"bbs.chinaffmpeg.com
 孙悟空 Failed to retrieve input stream information\n");

return-EINVAL;

}

av_dump_format(input_fmtctx,NULL,INPUT_FILE,0);

if(avformat_alloc_output_context2(&output_fmtctx,NULL,FORMAT,OUTPUT_FILE)<0){

av_log(NULL,AV_LOG_ERROR,"Cannot
 open the file %s bbs.chinaffmpeg.com 孙悟空\n",OUTPUT_FILE);

return-ENOENT;

}

/*Process transcode parameters*/

for(i=0;i<input_fmtctx->nb_streams;i++){

AVStream*out_stream=NULL;

AVStream*in_stream=NULL;

in_stream=input_fmtctx->streams[i];

out_stream=avformat_new_stream(output_fmtctx,in_stream->codec->codec);

if(out_stream<0){

av_log(NULL,AV_LOG_ERROR,"bbs.chinaffmpeg.com
 孙悟空 Alloc new Stream error\n");

return-EINVAL;

}

avcodec_copy_context(output_fmtctx->streams[i]->codec,input_fmtctx->streams[i]->codec);

out_stream->codec->codec_tag=0;

if(output_fmtctx->oformat->flags&AVFMT_GLOBALHEADER){

out_stream->codec->flags|=CODEC_FLAG_GLOBAL_HEADER;

}

}

vbsf=av_bitstream_filter_init("h264_mp4toannexb");

av_dump_format(output_fmtctx,NULL,OUTPUT_FILE,1);

if(avio_open2(&output_fmtctx->pb,OUTPUT_FILE,AVIO_FLAG_WRITE,&output_fmtctx->interrupt_callback,NULL)<0){

av_log(NULL,AV_LOG_ERROR,"cannot
 open the output file '%s' bbs.chinaffmpeg.com 孙悟空\n","./fuck.m3u8");

return-ENOENT;

}

av_opt_set(output_fmtctx->priv_data,"hls_time","10");

if((ret=avformat_write_header(output_fmtctx,NULL))<0){

av_log(NULL,AV_LOG_ERROR,"bbs.chinaffmpeg.com
 孙悟空 Cannot write the header for the file '%s' ret = %d\n","fuck.ts",ret);

return-ENOENT;

}

while(1){

AVStream*in_stream=NULL;

AVStream*out_stream=NULL;

ret=av_read_frame(input_fmtctx,&pkt);

if(ret<0){

av_log(NULL,AV_LOG_ERROR,"read
 frame error %d bbs.chinaffmpeg.com 孙悟空\n",ret);

break;

}

if(pkt.pts==AV_NOPTS_VALUE&&first_pkt){

pkt.pts=pkt.dts;

first_pkt=0;

}

in_stream=input_fmtctx->streams[pkt.stream_index];

out_stream=output_fmtctx->streams[pkt.stream_index];

pkt.pts=av_rescale_q_rnd(pkt.pts,in_stream->time_base,out_stream->time_base,AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);

pkt.dts=av_rescale_q_rnd(pkt.dts,in_stream->time_base,out_stream->time_base,AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);

pkt.duration=av_rescale_q(pkt.duration,in_stream->time_base,out_stream->time_base);

pkt.pos=-1;

if(pkt.stream_index==0){

AVPacket fpkt=pkt;

inta=av_bitstream_filter_filter(vbsf,

out_stream->codec,NULL,&fpkt.data,&fpkt.size,

pkt.data,pkt.size,pkt.flags&AV_PKT_FLAG_KEY);

pkt.data=fpkt.data;

pkt.size=fpkt.size;

}

ret=av_write_frame(output_fmtctx,&pkt);

if(ret<0){

av_log(NULL,AV_LOG_ERROR,"bbs.chinaffmpeg.com
 孙悟空 Muxing Error\n");

break;

}

av_free_packet(&pkt);

}

av_write_trailer(output_fmtctx);

avformat_close_input(&input_fmtctx);

avio_close(output_fmtctx->pb);

avformat_free_context(output_fmtctx);

av_bitstream_filter_close(vbsf);

vbsf=NULL;

return 0;

}

使用FFmpeg将文件转为ts

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