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#7 Ambience
16 octobre 2011, par
Mis à jour : Juin 2015
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Type : Audio
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Sur d’autres sites (10166)
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what is FFmpeg ?
18 mai 2012, par mirdadI am using the LINK to take frame from video ..but it says to create a commercial project that decodes H264 video, we have to make sure that we get a license from MPEG LA.
Why should we get license ?some tutorials say that we have to give complete source code to
LGPL , if we integrate statically FFMPEG.what is mean by statically ? what is the other option ?can we submit our App to Appstore(for storing video streams in server) without getting license from LGPL ?i am getting confused ? any help please ? -
FFmpeg RTP streaming
19 juillet 2016, par JohnnylinCan anyone show me an example code of how to use FFmpeg to encode a ".mp4" video and then output to network stream using RTP(rtp ://127.0.0.1:6666). I have searched for it on google but most of them are just command line. Thanks very much.
UPDATED :
extern "C"{
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>
#include <libavutil></libavutil>avutil.h>
#include <libavutil></libavutil>opt.h>
#include <libavutil></libavutil>time.h>
}
#include
#include <iostream>
#include <string>
using namespace std;
// compatibility with newer API
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif
#define RNDTO2(X) ( ( (X) & 0xFFFFFFFE ))
#define RNDTO32(X) ( ( (X) % 32 ) ? ( ( (X) + 32 ) & 0xFFFFFFE0 ) : (X) )
//avcodec_alloc_frame is an old name
int main(int argc, char *argv[]) {
// Initalizing these to NULL prevents segfaults!
AVFormatContext *pFormatCtx = NULL;
int i, videoStream;
AVCodecContext *pCodecCtxOrig = NULL;
AVCodecContext *pCodecCtx = NULL;
AVCodec *pCodec = NULL;
AVFrame *pFrame = NULL;
AVPacket packet;
int frameFinished;
int numBytes;
struct SwsContext *sws_ctx = NULL;
int frame_index=0;
if(argc < 2) {
printf("Please provide a movie file\n");
return -1;
}
// Register all formats and codecs
av_register_all();
//initialize network video
avformat_network_init();
int errorStatus = 0;
char errorLog[128] = { 0 };
av_log_set_level(AV_LOG_TRACE);
//------------------ This is for local video file --------------
// Open video file
if(avformat_open_input(&pFormatCtx, argv[1], NULL, NULL)!=0)
return -1; // Couldn't open file
// Retrieve stream information
if(avformat_find_stream_info(pFormatCtx, NULL)<0)
return -1; // Couldn't find stream information
// Find the first video stream
videoStream=-1;
for(i=0; inb_streams; i++)
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
videoStream=i;
break;
}
// Dump information about file onto standard error
av_dump_format(pFormatCtx, 0, argv[1], 0);
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtxOrig=pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtxOrig->codec_id);
if(pCodec==NULL) {
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
// Copy context
pCodecCtx = avcodec_alloc_context3(pCodec);
if(avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0) {
fprintf(stderr, "Couldn't copy codec context");
return -1; // Error copying codec context
}
// Open codec
if(avcodec_open2(pCodecCtx, pCodec, NULL)<0)
return -1; // Could not open codec
// Allocate video frame
pFrame=av_frame_alloc();
// use nvidia codec
AVCodec* en_codec = avcodec_find_encoder_by_name("nvenc");
//AVCodec* en_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
AVCodecContext* nv_codec_context = avcodec_alloc_context3(en_codec);
nv_codec_context->bit_rate = 1244179;
nv_codec_context->width = 1920;
nv_codec_context->height = 1080;
nv_codec_context->time_base.num = 1;
nv_codec_context->time_base.den = 30;
nv_codec_context->gop_size = 10;
nv_codec_context->max_b_frames = 1;
nv_codec_context->keyint_min = 1;
nv_codec_context->i_quant_factor = (float)0.71;
nv_codec_context->b_frame_strategy = 20;
nv_codec_context->qcompress = (float)0.6;
nv_codec_context->qmin = 20;
nv_codec_context->qmax = 51;
nv_codec_context->max_qdiff = 4;
nv_codec_context->refs = 4;
nv_codec_context->trellis = 1;
nv_codec_context->pix_fmt = AV_PIX_FMT_YUV420P;
//nv_codec_context->codec_id = AV_CODEC_ID_H264;
//nv_codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
if (avcodec_open2(nv_codec_context, en_codec,NULL) < 0) {
fprintf(stderr, "Could not open codec\n");
exit(1);
}else printf("\nH264 codec opened\n");
/******stream*******/
string m_output("rtp://147.8.179.229:6666");
AVFormatContext* m_formatContext = NULL;
AVStream* m_stream = NULL;
if (avformat_alloc_output_context2(&m_formatContext, NULL, "H264", m_output.c_str()) < 0) {
cerr << "Cannot allocate output context: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
//AVCodec* tmp_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
m_stream = avformat_new_stream(m_formatContext, en_codec);
if (!m_stream) {
cerr << "Cannot create a new stream: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
av_dump_format(m_formatContext, 0, m_output.c_str(), 1);
m_stream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
m_stream->codec->width = 1920;
m_stream->codec->height = 1080;
//m_stream->codec->codec_id = AV_CODEC_ID_H264;
m_stream->codec->bit_rate = 40000;
m_stream->codec->time_base.den = 30;
m_stream->codec->time_base.num = 1;
m_stream->time_base.den = 30;
m_stream->time_base.num = 1;
m_stream->codec->codec_tag = 0;
if (m_formatContext->oformat->flags & AVFMT_GLOBALHEADER)
m_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
if (!(m_formatContext->oformat->flags & AVFMT_NOFILE))
errorStatus = avio_open(&m_formatContext->pb, m_output.c_str(), AVIO_FLAG_WRITE);
if ((errorStatus) < 0) {
cerr << "Cannot open output: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
if (avformat_write_header(m_formatContext, NULL) < 0) {
cerr << "Cannot write header to stream: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
/******stream*******/
FILE *fp_yuv = NULL;
fp_yuv=fopen("output.yuv","wb+");
// Read frames and save first five frames to disk
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0) {
// Is this a packet from the video stream?
if(packet.stream_index==videoStream) {
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished) {
AVPacket Outpacket;
int got_packet_ptr;
av_init_packet(&Outpacket);
Outpacket.data = NULL;
Outpacket.size = 0;
int out_size = avcodec_encode_video2(nv_codec_context, &Outpacket, pFrame, &got_packet_ptr);
Outpacket.pts = av_rescale_q(pFrame->pts, m_stream->codec->time_base, m_stream->time_base);
fwrite(Outpacket.data,1,Outpacket.size,fp_yuv);
//av_write_frame(m_formatContext, &Outpacket);
av_interleaved_write_frame(m_formatContext, &Outpacket);
//Free the packet that was allocated by encoder
av_packet_unref(&Outpacket);
}
}
// Free the packet that was allocated by av_read_frame
av_packet_unref(&packet);
}
fclose(fp_yuv);
// Free the YUV frame
av_frame_free(&pFrame);
// Close the codecs
avcodec_close(pCodecCtx);
avcodec_close(pCodecCtxOrig);
avcodec_close(m_stream->codec);
avformat_free_context(m_formatContext);
// Close the video file
avformat_close_input(&pFormatCtx);
return 0;
}
</string></iostream>Above is my code for decoding a .mp4 file, outputting to a network stream through RTP. But it does not work. On the client side, I call VLC library to decode the stream ( VlcMedia(url, _instance) where url is rtp/h264 ://@147.8.179.229:6666 ). When I change the protocal to UDP, it works. However, it is not stable. The frames jumps and probably the frame lost or something wrong with the pts setting ?
Can anyone help ? Thanks very much.
-
FFmpeg RTP example code
20 juillet 2016, par JohnnylinCan anyone show me an example code of how to use FFmpeg to encode a ".mp4" video and then output to network stream using RTP(rtp ://127.0.0.1:6666). I have searched for it on google but most of them are just command line. Thanks very much.
UPDATED :
extern "C"{
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>
#include <libavutil></libavutil>avutil.h>
#include <libavutil></libavutil>opt.h>
#include <libavutil></libavutil>time.h>
}
#include
#include <iostream>
#include <string>
using namespace std;
// compatibility with newer API
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif
#define RNDTO2(X) ( ( (X) & 0xFFFFFFFE ))
#define RNDTO32(X) ( ( (X) % 32 ) ? ( ( (X) + 32 ) & 0xFFFFFFE0 ) : (X) )
//avcodec_alloc_frame is an old name
int main(int argc, char *argv[]) {
// Initalizing these to NULL prevents segfaults!
AVFormatContext *pFormatCtx = NULL;
int i, videoStream;
AVCodecContext *pCodecCtxOrig = NULL;
AVCodecContext *pCodecCtx = NULL;
AVCodec *pCodec = NULL;
AVFrame *pFrame = NULL;
AVPacket packet;
int frameFinished;
int numBytes;
struct SwsContext *sws_ctx = NULL;
int frame_index=0;
if(argc < 2) {
printf("Please provide a movie file\n");
return -1;
}
// Register all formats and codecs
av_register_all();
//initialize network video
avformat_network_init();
int errorStatus = 0;
char errorLog[128] = { 0 };
av_log_set_level(AV_LOG_TRACE);
//------------------ This is for local video file --------------
// Open video file
if(avformat_open_input(&pFormatCtx, argv[1], NULL, NULL)!=0)
return -1; // Couldn't open file
// Retrieve stream information
if(avformat_find_stream_info(pFormatCtx, NULL)<0)
return -1; // Couldn't find stream information
// Find the first video stream
videoStream=-1;
for(i=0; inb_streams; i++)
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
videoStream=i;
break;
}
// Dump information about file onto standard error
av_dump_format(pFormatCtx, 0, argv[1], 0);
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtxOrig=pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtxOrig->codec_id);
if(pCodec==NULL) {
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
// Copy context
pCodecCtx = avcodec_alloc_context3(pCodec);
if(avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0) {
fprintf(stderr, "Couldn't copy codec context");
return -1; // Error copying codec context
}
// Open codec
if(avcodec_open2(pCodecCtx, pCodec, NULL)<0)
return -1; // Could not open codec
// Allocate video frame
pFrame=av_frame_alloc();
// use nvidia codec
AVCodec* en_codec = avcodec_find_encoder_by_name("nvenc");
//AVCodec* en_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
AVCodecContext* nv_codec_context = avcodec_alloc_context3(en_codec);
nv_codec_context->bit_rate = 1244179;
nv_codec_context->width = 1920;
nv_codec_context->height = 1080;
nv_codec_context->time_base.num = 1;
nv_codec_context->time_base.den = 30;
nv_codec_context->gop_size = 10;
nv_codec_context->max_b_frames = 1;
nv_codec_context->keyint_min = 1;
nv_codec_context->i_quant_factor = (float)0.71;
nv_codec_context->b_frame_strategy = 20;
nv_codec_context->qcompress = (float)0.6;
nv_codec_context->qmin = 20;
nv_codec_context->qmax = 51;
nv_codec_context->max_qdiff = 4;
nv_codec_context->refs = 4;
nv_codec_context->trellis = 1;
nv_codec_context->pix_fmt = AV_PIX_FMT_YUV420P;
//nv_codec_context->codec_id = AV_CODEC_ID_H264;
//nv_codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
if (avcodec_open2(nv_codec_context, en_codec,NULL) < 0) {
fprintf(stderr, "Could not open codec\n");
exit(1);
}else printf("\nH264 codec opened\n");
/******stream*******/
string m_output("rtp://147.8.179.229:6666");
AVFormatContext* m_formatContext = NULL;
AVStream* m_stream = NULL;
if (avformat_alloc_output_context2(&m_formatContext, NULL, "H264", m_output.c_str()) < 0) {
cerr << "Cannot allocate output context: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
//AVCodec* tmp_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
m_stream = avformat_new_stream(m_formatContext, en_codec);
if (!m_stream) {
cerr << "Cannot create a new stream: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
av_dump_format(m_formatContext, 0, m_output.c_str(), 1);
m_stream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
m_stream->codec->width = 1920;
m_stream->codec->height = 1080;
//m_stream->codec->codec_id = AV_CODEC_ID_H264;
m_stream->codec->bit_rate = 40000;
m_stream->codec->time_base.den = 30;
m_stream->codec->time_base.num = 1;
m_stream->time_base.den = 30;
m_stream->time_base.num = 1;
m_stream->codec->codec_tag = 0;
if (m_formatContext->oformat->flags & AVFMT_GLOBALHEADER)
m_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
if (!(m_formatContext->oformat->flags & AVFMT_NOFILE))
errorStatus = avio_open(&m_formatContext->pb, m_output.c_str(), AVIO_FLAG_WRITE);
if ((errorStatus) < 0) {
cerr << "Cannot open output: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
if (avformat_write_header(m_formatContext, NULL) < 0) {
cerr << "Cannot write header to stream: "
<< av_make_error_string(errorLog, 128, errorStatus) << endl;
return -1;
}
/******stream*******/
FILE *fp_yuv = NULL;
fp_yuv=fopen("output.yuv","wb+");
// Read frames and save first five frames to disk
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0) {
// Is this a packet from the video stream?
if(packet.stream_index==videoStream) {
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished) {
AVPacket Outpacket;
int got_packet_ptr;
av_init_packet(&Outpacket);
Outpacket.data = NULL;
Outpacket.size = 0;
int out_size = avcodec_encode_video2(nv_codec_context, &Outpacket, pFrame, &got_packet_ptr);
Outpacket.pts = av_rescale_q(pFrame->pts, m_stream->codec->time_base, m_stream->time_base);
fwrite(Outpacket.data,1,Outpacket.size,fp_yuv);
//av_write_frame(m_formatContext, &Outpacket);
av_interleaved_write_frame(m_formatContext, &Outpacket);
//Free the packet that was allocated by encoder
av_packet_unref(&Outpacket);
}
}
// Free the packet that was allocated by av_read_frame
av_packet_unref(&packet);
}
fclose(fp_yuv);
// Free the YUV frame
av_frame_free(&pFrame);
// Close the codecs
avcodec_close(pCodecCtx);
avcodec_close(pCodecCtxOrig);
avcodec_close(m_stream->codec);
avformat_free_context(m_formatContext);
// Close the video file
avformat_close_input(&pFormatCtx);
return 0;
}
</string></iostream>Above is my code for decoding a .mp4 file, outputting to a network stream through RTP. But it does not work. On the client side, I call VLC library to decode the stream ( VlcMedia(url, _instance) where url is rtp/h264 ://@147.8.179.229:6666 ). When I change the protocal to UDP, it works. However, it is not stable. The frames jumps and probably the frame lost or something wrong with the pts setting ?
UPDATED :
When I use UDP, I got this error message.
When I use RTP, I got this error message :
Not sure about how to solve this problem, Can anyone help ? Thanks very much.
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