最简单的基于FFmpeg的封装格式处理:视音频复用器(muxer)
2015-01-15 11:59
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=====================================================
最简单的基于FFmpeg的封装格式处理系列文章列表:
最简单的基于FFmpeg的封装格式处理:视音频分离器简化版(demuxer-simple)
最简单的基于FFmpeg的封装格式处理:视音频分离器(demuxer)
最简单的基于FFmpeg的封装格式处理:视音频复用器(muxer)
最简单的基于FFMPEG的封装格式处理:封装格式转换(remuxer)
=====================================================
本文记录一个基于FFmpeg的视音频复用器(Simplest FFmpeg muxer)。视音频复用器(Muxer)即是将视频压缩数据(例如H.264)和音频压缩数据(例如AAC)合并到一个封装格式数据(例如MKV)中去。如图所示。在这个过程中并不涉及到编码和解码。
![](https://oscdn.geek-share.com/Uploads/Images/Content/201501/7120a78594b6b5a8b65528cd1e678f6f)
本文记录的程序将一个H.264编码的视频码流文件和一个MP3编码的音频码流文件,合成为一个MP4封装格式的文件。
![](https://oscdn.geek-share.com/Uploads/Images/Content/201501/a2d0bdfd0b7c89a084febad9d2bf39e1)
单击查看更清晰的图片
本文介绍的视音频复用器,输入的视频不一定是H.264裸流文件,音频也不一定是纯音频文件。可以选择两个封装过的视音频文件作为输入。程序会从视频输入文件中“挑”出视频流,音频输入文件中“挑”出音频流,再将“挑选”出来的视音频流复用起来。
PS1:对于某些封装格式(例如MP4/FLV/MKV等)中的H.264,需要用到名称为“h264_mp4toannexb”的bitstream filter。
PS2:对于某些封装格式(例如MP4/FLV/MKV等)中的AAC,需要用到名称为“aac_adtstoasc”的bitstream filter。
简单介绍一下流程中各个重要函数的意义:
avformat_open_input():打开输入文件。
avcodec_copy_context():赋值AVCodecContext的参数。
avformat_alloc_output_context2():初始化输出文件。
avio_open():打开输出文件。
avformat_write_header():写入文件头。
av_compare_ts():比较时间戳,决定写入视频还是写入音频。这个函数相对要少见一些。
av_read_frame():从输入文件读取一个AVPacket。
av_interleaved_write_frame():写入一个AVPacket到输出文件。
av_write_trailer():写入文件尾。
[cpp] view
plaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
/**
* 最简单的基于FFmpeg的视音频复用器
* Simplest FFmpeg Muxer
*
* 雷霄骅 Lei Xiaohua
* leixiaohua1020@126.com
* 中国传媒大学/数字电视技术
* Communication University of China / Digital TV Technology
* http://blog.csdn.net/leixiaohua1020
*
* 本程序可以将视频码流和音频码流打包到一种封装格式中。
* 程序中将MP3编码的音频码流和H.264编码(MPEG2TS封装中)的视频码流打包成
* MP4封装格式的文件。
* 需要注意的是本程序并不改变视音频的编码格式。
*
* This software mux a video bitstream and a audio bitstream
* together into a file.
* In this example, it mux a H.264 bitstream (in MPEG2TS) and
* a MP3 bitstream file together into MP4 format file.
*
*/
#include <stdio.h>
extern "C"
{
#include "libavformat/avformat.h"
};
/*
FIX: H.264 in some container format (FLV, MP4, MKV etc.) need
"h264_mp4toannexb" bitstream filter (BSF)
*Add SPS,PPS in front of IDR frame
*Add start code ("0,0,0,1") in front of NALU
H.264 in some container (MPEG2TS) don't need this BSF.
*/
//'1': Use H.264 Bitstream Filter
#define USE_H264BSF 0
/*
FIX:AAC in some container format (FLV, MP4, MKV etc.) need
"aac_adtstoasc" bitstream filter (BSF)
*/
//'1': Use AAC Bitstream Filter
#define USE_AACBSF 0
int main(int argc, char* argv[])
{
AVOutputFormat *ofmt = NULL;
//输入对应一个AVFormatContext,输出对应一个AVFormatContext
//(Input AVFormatContext and Output AVFormatContext)
AVFormatContext *ifmt_ctx_v = NULL, *ifmt_ctx_a = NULL,*ofmt_ctx = NULL;
AVPacket pkt;
int ret, i;
char *in_filename_v = "cuc_ieschool.ts";//输入文件名(Input file URL)
//char *in_filename_v = "cuc_ieschool.h264";
//char *in_filename_a = "cuc_ieschool.mp3";
//char *in_filename_a = "gowest.m4a";
//char *in_filename_a = "gowest.aac";
char *in_filename_a = "huoyuanjia.mp3";
char *out_filename = "cuc_ieschool.mp4";//输出文件名(Output file URL)
av_register_all();
//输入(Input)
if ((ret = avformat_open_input(&ifmt_ctx_v, in_filename_v, 0, 0)) < 0) {
printf( "Could not open input file.");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx_v, 0)) < 0) {
printf( "Failed to retrieve input stream information");
goto end;
}
if ((ret = avformat_open_input(&ifmt_ctx_a, in_filename_a, 0, 0)) < 0) {
printf( "Could not open input file.");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx_a, 0)) < 0) {
printf( "Failed to retrieve input stream information");
goto end;
}
printf("Input Information=====================\n");
av_dump_format(ifmt_ctx_v, 0, in_filename_v, 0);
av_dump_format(ifmt_ctx_a, 0, in_filename_a, 0);
printf("======================================\n");
//输出(Output)
avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
if (!ofmt_ctx) {
printf( "Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
ofmt = ofmt_ctx->oformat;
int videoindex_v=-1,videoindex_out=-1;
for (i = 0; i < ifmt_ctx_v->nb_streams; i++) {
//根据输入流创建输出流(Create output AVStream according to input AVStream)
if(ifmt_ctx_v->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
videoindex_v=i;
AVStream *in_stream = ifmt_ctx_v->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
videoindex_out=out_stream->index;
//复制AVCodecContext的设置(Copy the settings of AVCodecContext)
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
break;
}
}
int audioindex_a=-1,audioindex_out=-1;
for (i = 0; i < ifmt_ctx_a->nb_streams; i++) {
//根据输入流创建输出流(Create output AVStream according to input AVStream)
if(ifmt_ctx_a->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
audioindex_a=i;
AVStream *in_stream = ifmt_ctx_a->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
audioindex_out=out_stream->index;
//复制AVCodecContext的设置(Copy the settings of AVCodecContext)
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
break;
}
}
//输出一下格式------------------
printf("Output Information====================\n");
av_dump_format(ofmt_ctx, 0, out_filename, 1);
printf("======================================\n");
//打开输出文件(Open output file)
if (!(ofmt->flags & AVFMT_NOFILE)) {
if (avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE) < 0) {
printf( "Could not open output file '%s'", out_filename);
goto end;
}
}
//写文件头(Write file header)
if (avformat_write_header(ofmt_ctx, NULL) < 0) {
printf( "Error occurred when opening output file\n");
goto end;
}
int frame_index=0;
int64_t cur_pts_v=0,cur_pts_a=0;
//FIX
#if USE_H264BSF
AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
#endif
#if USE_AACBSF
AVBitStreamFilterContext* aacbsfc = av_bitstream_filter_init("aac_adtstoasc");
#endif
while (1) {
AVFormatContext *ifmt_ctx;
int stream_index=0;
AVStream *in_stream, *out_stream;
//获取一个AVPacket(Get an AVPacket)
if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <= 0){
ifmt_ctx=ifmt_ctx_v;
stream_index=videoindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
if(pkt.stream_index==videoindex_v){
cur_pts_v=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}else{
ifmt_ctx=ifmt_ctx_a;
stream_index=audioindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
if(pkt.stream_index==audioindex_a){
cur_pts_a=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
//FIX
#if USE_H264BSF
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
#if USE_AACBSF
av_bitstream_filter_filter(aacbsfc, out_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
//FIX:No PTS (Example: Raw H.264)
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
/* copy packet */
//转换PTS/DTS(Convert PTS/DTS)
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(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;
pkt.stream_index=stream_index;
printf("Write 1 Packet. size:%5d\tpts:%8d\n",pkt.size,pkt.pts);
//写入(Write)
if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {
printf( "Error muxing packet\n");
break;
}
av_free_packet(&pkt);
}
//写文件尾(Write file trailer)
av_write_trailer(ofmt_ctx);
#if USE_H264BSF
av_bitstream_filter_close(h264bsfc);
#endif
#if USE_AACBSF
av_bitstream_filter_close(aacbsfc);
#endif
end:
avformat_close_input(&ifmt_ctx_v);
avformat_close_input(&ifmt_ctx_a);
/* close output */
if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
avio_close(ofmt_ctx->pb);
avformat_free_context(ofmt_ctx);
if (ret < 0 && ret != AVERROR_EOF) {
printf( "Error occurred.\n");
return -1;
}
return 0;
}
视频:cuc_ieschool.ts
音频:huoyuanjia.mp3
输出文件为:
cuc_ieschool.mp4
输出的文件视频为“cuc_ieschool”,配合“霍元甲”的音频。
项目主页
SourceForge:https://sourceforge.net/projects/simplestffmpegformat/
Github:https://github.com/leixiaohua1020/simplest_ffmpeg_format
开源中国:http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_format
CSDN下载:
http://download.csdn.net/detail/leixiaohua1020/8005317
工程中包含4个例子:
simplest_ffmpeg_demuxer_simple:视音频分离器(简化版)。
simplest_ffmpeg_demuxer:视音频分离器。
simplest_ffmpeg_muxer:视音频复用器。
simplest_ffmpeg_remuxer:封装格式转换器。
1.1版更新======================
修复了以下问题:
(1)Release版本下的运行问题
(2)simplest_ffmpeg_muxer封装H.264裸流的时候丢失声音的错误
关于simplest_ffmpeg_muxer封装H.264裸流的时候丢失声音的问题目前已经解决。根源在于H.264裸流没有PTS,因此必须手动写入PTS。写入PTS的代码在在旧版本中已经包含:
[cpp] view
plaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
//FIX:No PTS
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
但是旧版本中这段代码的位置放错了,应该放在av_read_frame()之后,cur_pts_a/cur_pts_v赋值之前。换句话说,也就说要把这段代码“前移”。修改后的循环处理AVPacket的源代码如下所示。
[cpp] view
plaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
while (1) {
AVFormatContext *ifmt_ctx;
int stream_index=0;
AVStream *in_stream, *out_stream;
//获取一个AVPacket(Get an AVPacket)
if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <= 0){
ifmt_ctx=ifmt_ctx_v;
stream_index=videoindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
if(pkt.stream_index==videoindex_v){
//FIX:No PTS (Example: Raw H.264)
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
cur_pts_v=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}else{
ifmt_ctx=ifmt_ctx_a;
stream_index=audioindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
if(pkt.stream_index==audioindex_a){
//FIX:No PTS
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
cur_pts_a=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}
//FIX:Bitstream Filter
#if USE_H264BSF
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
#if USE_AACBSF
av_bitstream_filter_filter(aacbsfc, out_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
/* copy packet */
//转换PTS/DTS(Convert PTS/DTS)
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(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;
pkt.stream_index=stream_index;
printf("Write 1 Packet. size:%5d\tpts:%8d\n",pkt.size,pkt.pts);
//写入(Write)
if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {
printf( "Error muxing packet\n");
break;
}
av_free_packet(&pkt);
}
CSDN下载
http://download.csdn.net/detail/leixiaohua1020/8284309
最简单的基于FFmpeg的封装格式处理系列文章列表:
最简单的基于FFmpeg的封装格式处理:视音频分离器简化版(demuxer-simple)
最简单的基于FFmpeg的封装格式处理:视音频分离器(demuxer)
最简单的基于FFmpeg的封装格式处理:视音频复用器(muxer)
最简单的基于FFMPEG的封装格式处理:封装格式转换(remuxer)
=====================================================
简介
打算记录一下基于FFmpeg的封装格式处理方面的例子。包括了视音频分离,复用,封装格式转换。这是第3篇。本文记录一个基于FFmpeg的视音频复用器(Simplest FFmpeg muxer)。视音频复用器(Muxer)即是将视频压缩数据(例如H.264)和音频压缩数据(例如AAC)合并到一个封装格式数据(例如MKV)中去。如图所示。在这个过程中并不涉及到编码和解码。
本文记录的程序将一个H.264编码的视频码流文件和一个MP3编码的音频码流文件,合成为一个MP4封装格式的文件。
流程
程序的流程如下图所示。从流程图中可以看出,一共初始化了3个AVFormatContext,其中2个用于输入,1个用于输出。3个AVFormatContext初始化之后,通过avcodec_copy_context()函数可以将输入视频/音频的参数拷贝至输出视频/音频的AVCodecContext结构体。然后分别调用视频输入流和音频输入流的av_read_frame(),从视频输入流中取出视频的AVPacket,音频输入流中取出音频的AVPacket,分别将取出的AVPacket写入到输出文件中即可。其间用到了一个不太常见的函数av_compare_ts(),是比较时间戳用的。通过该函数可以决定该写入视频还是音频。单击查看更清晰的图片
本文介绍的视音频复用器,输入的视频不一定是H.264裸流文件,音频也不一定是纯音频文件。可以选择两个封装过的视音频文件作为输入。程序会从视频输入文件中“挑”出视频流,音频输入文件中“挑”出音频流,再将“挑选”出来的视音频流复用起来。
PS1:对于某些封装格式(例如MP4/FLV/MKV等)中的H.264,需要用到名称为“h264_mp4toannexb”的bitstream filter。
PS2:对于某些封装格式(例如MP4/FLV/MKV等)中的AAC,需要用到名称为“aac_adtstoasc”的bitstream filter。
简单介绍一下流程中各个重要函数的意义:
avformat_open_input():打开输入文件。
avcodec_copy_context():赋值AVCodecContext的参数。
avformat_alloc_output_context2():初始化输出文件。
avio_open():打开输出文件。
avformat_write_header():写入文件头。
av_compare_ts():比较时间戳,决定写入视频还是写入音频。这个函数相对要少见一些。
av_read_frame():从输入文件读取一个AVPacket。
av_interleaved_write_frame():写入一个AVPacket到输出文件。
av_write_trailer():写入文件尾。
代码
下面贴上代码:[cpp] view
plaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
/**
* 最简单的基于FFmpeg的视音频复用器
* Simplest FFmpeg Muxer
*
* 雷霄骅 Lei Xiaohua
* leixiaohua1020@126.com
* 中国传媒大学/数字电视技术
* Communication University of China / Digital TV Technology
* http://blog.csdn.net/leixiaohua1020
*
* 本程序可以将视频码流和音频码流打包到一种封装格式中。
* 程序中将MP3编码的音频码流和H.264编码(MPEG2TS封装中)的视频码流打包成
* MP4封装格式的文件。
* 需要注意的是本程序并不改变视音频的编码格式。
*
* This software mux a video bitstream and a audio bitstream
* together into a file.
* In this example, it mux a H.264 bitstream (in MPEG2TS) and
* a MP3 bitstream file together into MP4 format file.
*
*/
#include <stdio.h>
extern "C"
{
#include "libavformat/avformat.h"
};
/*
FIX: H.264 in some container format (FLV, MP4, MKV etc.) need
"h264_mp4toannexb" bitstream filter (BSF)
*Add SPS,PPS in front of IDR frame
*Add start code ("0,0,0,1") in front of NALU
H.264 in some container (MPEG2TS) don't need this BSF.
*/
//'1': Use H.264 Bitstream Filter
#define USE_H264BSF 0
/*
FIX:AAC in some container format (FLV, MP4, MKV etc.) need
"aac_adtstoasc" bitstream filter (BSF)
*/
//'1': Use AAC Bitstream Filter
#define USE_AACBSF 0
int main(int argc, char* argv[])
{
AVOutputFormat *ofmt = NULL;
//输入对应一个AVFormatContext,输出对应一个AVFormatContext
//(Input AVFormatContext and Output AVFormatContext)
AVFormatContext *ifmt_ctx_v = NULL, *ifmt_ctx_a = NULL,*ofmt_ctx = NULL;
AVPacket pkt;
int ret, i;
char *in_filename_v = "cuc_ieschool.ts";//输入文件名(Input file URL)
//char *in_filename_v = "cuc_ieschool.h264";
//char *in_filename_a = "cuc_ieschool.mp3";
//char *in_filename_a = "gowest.m4a";
//char *in_filename_a = "gowest.aac";
char *in_filename_a = "huoyuanjia.mp3";
char *out_filename = "cuc_ieschool.mp4";//输出文件名(Output file URL)
av_register_all();
//输入(Input)
if ((ret = avformat_open_input(&ifmt_ctx_v, in_filename_v, 0, 0)) < 0) {
printf( "Could not open input file.");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx_v, 0)) < 0) {
printf( "Failed to retrieve input stream information");
goto end;
}
if ((ret = avformat_open_input(&ifmt_ctx_a, in_filename_a, 0, 0)) < 0) {
printf( "Could not open input file.");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx_a, 0)) < 0) {
printf( "Failed to retrieve input stream information");
goto end;
}
printf("Input Information=====================\n");
av_dump_format(ifmt_ctx_v, 0, in_filename_v, 0);
av_dump_format(ifmt_ctx_a, 0, in_filename_a, 0);
printf("======================================\n");
//输出(Output)
avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
if (!ofmt_ctx) {
printf( "Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
ofmt = ofmt_ctx->oformat;
int videoindex_v=-1,videoindex_out=-1;
for (i = 0; i < ifmt_ctx_v->nb_streams; i++) {
//根据输入流创建输出流(Create output AVStream according to input AVStream)
if(ifmt_ctx_v->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
videoindex_v=i;
AVStream *in_stream = ifmt_ctx_v->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
videoindex_out=out_stream->index;
//复制AVCodecContext的设置(Copy the settings of AVCodecContext)
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
break;
}
}
int audioindex_a=-1,audioindex_out=-1;
for (i = 0; i < ifmt_ctx_a->nb_streams; i++) {
//根据输入流创建输出流(Create output AVStream according to input AVStream)
if(ifmt_ctx_a->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
audioindex_a=i;
AVStream *in_stream = ifmt_ctx_a->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
audioindex_out=out_stream->index;
//复制AVCodecContext的设置(Copy the settings of AVCodecContext)
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
break;
}
}
//输出一下格式------------------
printf("Output Information====================\n");
av_dump_format(ofmt_ctx, 0, out_filename, 1);
printf("======================================\n");
//打开输出文件(Open output file)
if (!(ofmt->flags & AVFMT_NOFILE)) {
if (avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE) < 0) {
printf( "Could not open output file '%s'", out_filename);
goto end;
}
}
//写文件头(Write file header)
if (avformat_write_header(ofmt_ctx, NULL) < 0) {
printf( "Error occurred when opening output file\n");
goto end;
}
int frame_index=0;
int64_t cur_pts_v=0,cur_pts_a=0;
//FIX
#if USE_H264BSF
AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
#endif
#if USE_AACBSF
AVBitStreamFilterContext* aacbsfc = av_bitstream_filter_init("aac_adtstoasc");
#endif
while (1) {
AVFormatContext *ifmt_ctx;
int stream_index=0;
AVStream *in_stream, *out_stream;
//获取一个AVPacket(Get an AVPacket)
if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <= 0){
ifmt_ctx=ifmt_ctx_v;
stream_index=videoindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
if(pkt.stream_index==videoindex_v){
cur_pts_v=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}else{
ifmt_ctx=ifmt_ctx_a;
stream_index=audioindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
if(pkt.stream_index==audioindex_a){
cur_pts_a=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
//FIX
#if USE_H264BSF
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
#if USE_AACBSF
av_bitstream_filter_filter(aacbsfc, out_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
//FIX:No PTS (Example: Raw H.264)
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
/* copy packet */
//转换PTS/DTS(Convert PTS/DTS)
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(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;
pkt.stream_index=stream_index;
printf("Write 1 Packet. size:%5d\tpts:%8d\n",pkt.size,pkt.pts);
//写入(Write)
if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {
printf( "Error muxing packet\n");
break;
}
av_free_packet(&pkt);
}
//写文件尾(Write file trailer)
av_write_trailer(ofmt_ctx);
#if USE_H264BSF
av_bitstream_filter_close(h264bsfc);
#endif
#if USE_AACBSF
av_bitstream_filter_close(aacbsfc);
#endif
end:
avformat_close_input(&ifmt_ctx_v);
avformat_close_input(&ifmt_ctx_a);
/* close output */
if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
avio_close(ofmt_ctx->pb);
avformat_free_context(ofmt_ctx);
if (ret < 0 && ret != AVERROR_EOF) {
printf( "Error occurred.\n");
return -1;
}
return 0;
}
结果
输入文件为:视频:cuc_ieschool.ts
音频:huoyuanjia.mp3
输出文件为:
cuc_ieschool.mp4
输出的文件视频为“cuc_ieschool”,配合“霍元甲”的音频。
下载
simplest ffmpeg format项目主页
SourceForge:https://sourceforge.net/projects/simplestffmpegformat/
Github:https://github.com/leixiaohua1020/simplest_ffmpeg_format
开源中国:http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_format
CSDN下载:
http://download.csdn.net/detail/leixiaohua1020/8005317
工程中包含4个例子:
simplest_ffmpeg_demuxer_simple:视音频分离器(简化版)。
simplest_ffmpeg_demuxer:视音频分离器。
simplest_ffmpeg_muxer:视音频复用器。
simplest_ffmpeg_remuxer:封装格式转换器。
1.1版更新======================
修复了以下问题:
(1)Release版本下的运行问题
(2)simplest_ffmpeg_muxer封装H.264裸流的时候丢失声音的错误
关于simplest_ffmpeg_muxer封装H.264裸流的时候丢失声音的问题目前已经解决。根源在于H.264裸流没有PTS,因此必须手动写入PTS。写入PTS的代码在在旧版本中已经包含:
[cpp] view
plaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
//FIX:No PTS
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
但是旧版本中这段代码的位置放错了,应该放在av_read_frame()之后,cur_pts_a/cur_pts_v赋值之前。换句话说,也就说要把这段代码“前移”。修改后的循环处理AVPacket的源代码如下所示。
[cpp] view
plaincopy
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
while (1) {
AVFormatContext *ifmt_ctx;
int stream_index=0;
AVStream *in_stream, *out_stream;
//获取一个AVPacket(Get an AVPacket)
if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <= 0){
ifmt_ctx=ifmt_ctx_v;
stream_index=videoindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
if(pkt.stream_index==videoindex_v){
//FIX:No PTS (Example: Raw H.264)
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
cur_pts_v=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}else{
ifmt_ctx=ifmt_ctx_a;
stream_index=audioindex_out;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[stream_index];
if(pkt.stream_index==audioindex_a){
//FIX:No PTS
//Simple Write PTS
if(pkt.pts==AV_NOPTS_VALUE){
//Write PTS
AVRational time_base1=in_stream->time_base;
//Duration between 2 frames (us)
int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);
//Parameters
pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts=pkt.pts;
pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
frame_index++;
}
cur_pts_a=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}
//FIX:Bitstream Filter
#if USE_H264BSF
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
#if USE_AACBSF
av_bitstream_filter_filter(aacbsfc, out_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
/* copy packet */
//转换PTS/DTS(Convert PTS/DTS)
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(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;
pkt.stream_index=stream_index;
printf("Write 1 Packet. size:%5d\tpts:%8d\n",pkt.size,pkt.pts);
//写入(Write)
if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {
printf( "Error muxing packet\n");
break;
}
av_free_packet(&pkt);
}
CSDN下载
http://download.csdn.net/detail/leixiaohua1020/8284309
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