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How to extract elementary video from mp4 using ffmpeg programmatically ?
4 juillet 2013, par epipavI have started learning ffmpeg few weaks ago. At the moment I am able to transcode any video to mp4 using h264/AVC codec. The main scheme is something like that :
-open input
demux
decode
encode
muxThe actual code is below :
#include <iostream>
#include
extern "C"
{
#ifndef __STDC_CONSTANT_MACROS
#undef main /* Prevents SDL from overriding main() */
# define __STDC_CONSTANT_MACROS
#endif
#pragma comment (lib,"avcodec.lib")
#pragma comment (lib,"avformat.lib")
#pragma comment (lib,"swscale.lib")
#pragma comment(lib,"avutil.lib")
#include
#include
#include
#include
#include <libavutil></libavutil>opt.h>
#include
#include
#include
#include
#include
}
using namespace std;
void open_video(AVFormatContext*oc , AVCodec *codec, AVStream * st)
{
int ret;
AVCodecContext *c ;
c = st->codec;
/*open codec */
cout << "probably starts here" << endl;
ret = avcodec_open2(c,codec,NULL);
cout << "and ends here" << endl;
if ( ret < 0)
{
cout << ("Could not open video codec") << endl;
}
}
/*This function will add a new stream to our file.
@param
oc -> Format context that the new stream will be added.
codec -> codec of the stream, this will be passed.
codec_id ->
chWidth->
chHeight->
*/
AVStream * addStream(AVFormatContext * oc, AVCodec **codec, enum AVCodecID codec_id, int chWidth, int chHeight, int fps)
{
AVCodecContext *c;
AVStream *st;
//find encoder of the stream, it passes this information to @codec, later on
//it will be used in encoding the video @ avcodec_encode_video2 in loop.
*codec = avcodec_find_encoder(AV_CODEC_ID_H264);
if ( (*codec) == NULL)
cout << "ERROR CAN NOT FIND ENCODER! ERROR! ERROR! AVCODEC_FIND_ENCODER FAILED !!!1 """ << endl;
if(!(*codec))
printf ("Could not find encoder for ' %s ' ", avcodec_get_name(codec_id));
//create a new stream with the found codec inside oc(AVFormatContext).
st = avformat_new_stream ( oc, *codec);
if (!st)
cout << " Cannot allocate stream " << endl;
//Setting the stream id.
//Since, there can be other streams in this AVFormatContext,
//we should find the first non used index. And this is oc->nb_streams(number of streams) - 1
st ->id = oc ->nb_streams - 1;
c = st->codec;
//setting the stream's codec's properties.
c-> codec_id = codec_id;
c->bit_rate = 4000000;
c->width = chWidth;
c->height = chHeight;
c->time_base.den = fps;
//fps;
c->time_base.num = 1;
c->gop_size = 12;
c->pix_fmt = AV_PIX_FMT_YUV420P;
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
/* just for testing, we also add B frames */
c->max_b_frames = 2;
}
if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
/* Needed to avoid using macroblocks in which some coeffs overflow.
* This does not happen with normal video, it just happens here as
* the motion of the chroma plane does not match the luma plane. */
c->mb_decision = 2;
}
/* Some formats want stream headers to be separate. */
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
//returning our lovely new brand stream.
return st;
}
int changeResolution ( string source, int format )
{
//Data members
struct SwsContext *sws_ctx = NULL;
AVFrame *pFrame = NULL;
AVFrame *outFrame = NULL;
AVPacket packet;
uint8_t *buffer = NULL;
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
AVDictionary *optionsDict = NULL;
AVFormatContext *pFormatCtx = NULL;
AVFormatContext *outputContext = NULL;
AVCodecContext *pCodecCtx;
AVCodec *pCodec ;
AVCodec *codec;
AVCodec *videoCodec;
AVOutputFormat *fmt;
AVStream *video_stream;
int changeWidth;
int changeHeight;
int frameFinished;
int numBytes;
int fps;
int lock = 0;
//Register all codecs & other important stuff. Vital!..
av_register_all();
//Selects the desired resolution.
if (format == 0)
{
changeWidth = 320;
changeHeight = 180;
}
else if (format == 1)
{
changeWidth = 640;
changeHeight = 480;
}
else if (format == 2)
{
changeWidth = 960;
changeHeight = 540;
}
else if (format == 3)
{
changeWidth = 1024;
changeHeight = 768;
}
else
{
changeWidth = 1280;
changeHeight = 720;
}
// Open video file
int aaa;
aaa = avformat_open_input(&pFormatCtx, source.c_str(), NULL, NULL) ;
if(aaa !=0)
{
cout << " cannot open input file \n" << endl;
cout << "aaa = " << aaa << endl;
return -1; // Couldn't open file
}
// Retrieve stream information
if(av_find_stream_info(pFormatCtx)<0)
return -1; // Couldn't find stream information
//just checking duration casually for no reason
/*int64_t duration = pFormatCtx->duration;
cout << "the duration is " << duration << " " << endl;*/
//this writes the info about the file
av_dump_format(pFormatCtx, 0, 0, 0);
cin >> lock;
// Find the first video stream
int videoStream=-1;
int i;
for(i=0; i<3; i++)
if(pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
videoStream=i;
cout << " lel \n " ;
break;
}
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
fps = pCodecCtx -> time_base.den;
//Find the decoder of the input file, for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL) {
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
// Open codec, you must open it first, in order to use it.
if(avcodec_open2(pCodecCtx, pCodec, &optionsDict)<0)
return -1; // Could not open codec
// Allocate video frame ( pFrame for taking the packets into, outFrame for processed frames to packet.)
pFrame=avcodec_alloc_frame();
outFrame = avcodec_alloc_frame();
i=0;
int ret;
int video_frame_count = 0;
//Initiate the outFrame set the buffer & fill the properties
numBytes=avpicture_get_size(PIX_FMT_YUV420P, changeWidth, changeHeight);
buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
avpicture_fill((AVPicture *)outFrame, buffer, PIX_FMT_YUV420P, changeWidth, changeHeight );
int pp;
int frameNo = 0;
//allocate the outputContext, it will be the AVFormatContext of our output file.
//It will try to find the format by giving the file name.
avformat_alloc_output_context2(&outputContext,NULL,NULL, "myoutput.mp4");
//Cant find the file extension, using MPEG as default.
if (!outputContext) {
printf("Could not deduce output format from file extension: using MPEG.\n");
avformat_alloc_output_context2(&outputContext, NULL, "mpeg", "myoutput.mp4");
}
//Still cant set file extension, exit.
if (!outputContext) {
return 1;
}
//set AVOutputFormat fmt to our outputContext's format.
fmt = outputContext -> oformat;
video_stream = NULL;
//If fmt has a valid codec_id, create a new video stream.
//This function will set the streams codec & codecs desired properties.
//Stream's codec will be passed to videoCodec for later usage.
if (fmt -> video_codec != AV_CODEC_ID_NONE)
video_stream = addStream(outputContext, &videoCodec, fmt ->video_codec, changeWidth, changeHeight,fps);
//open the video using videoCodec. by avcodec_open2() i.e open the codec.
if (video_stream)
open_video(outputContext, videoCodec, video_stream);
//Creating our new output file.
if (!(fmt->flags & AVFMT_NOFILE)) {
ret = avio_open(&outputContext->pb, "toBeStreamed.264", AVIO_FLAG_WRITE);
if (ret < 0) {
cout << " cant open file " << endl;
return 1;
}
}
//Writing the header of format context.
//ret = avformat_write_header(outputContext, NULL);
if (ret >= 0) {
cout << "writing header success !!!" << endl;
}
//Start reading packages from input file.
while(av_read_frame(pFormatCtx, &packet)>=0 ) {
// Is this a packet from the video stream?
if(packet.stream_index==videoStream) {
// Decode video package into frames
ret = avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
if( ret < 0)
{
printf ( " Error decoding frame !!.." );
return ret;
}
if (frameFinished){
printf("video_frame n:%d coded_n:%d\n" , video_frame_count++, pFrame->coded_picture_number);
}
av_free_packet(&packet);
//do stuff with frame, in this case we are changing the resolution.
static struct SwsContext *img_convert_ctx_in = NULL;
if (img_convert_ctx_in == NULL)
{
img_convert_ctx_in =sws_getContext( pCodecCtx->width,
pCodecCtx->height,
pCodecCtx->pix_fmt,
changeWidth,
changeHeight,
PIX_FMT_YUV420P,
SWS_BICUBIC,
NULL,
NULL,
NULL );
}
//scale the frames
sws_scale(img_convert_ctx_in,
pFrame->data,
pFrame->linesize,
0,
pCodecCtx->height,
outFrame->data,
outFrame->linesize);
//initiate the pts value
if ( frameNo == 0)
outFrame->pts = 0;
//calculate the pts value & set it.
outFrame->pts += av_rescale_q(1, video_stream->codec->time_base, video_stream->time_base);
//encode frames into packages. Package passed in @packet.
if(avcodec_encode_video2(outputContext->streams[0]->codec, &packet, outFrame, &pp) < 0 )
cout << "Encoding frames into packages, failed. " << endl;
frameNo++;
//write the packages into file, resulting in creating a video file.
av_interleaved_write_frame(outputContext,&packet);
}
}
av_free_packet(&packet);
//av_write_trailer(outputContext);
avio_close(outputContext->pb);
// Free the RGB image
av_free(buffer);
av_free(outFrame);
// Free the YUV frame
av_free(pFrame);
// Close the codec
avcodec_close(video_stream->codec);
avcodec_close(pCodecCtx);
// Close the video file
avformat_close_input(&pFormatCtx);
return 0;
}
</iostream>at the end of the process I get my desired file with desired codec & container & resolution.
My problem is, in a part of our project I need to get elementary video streams IN file. Such as example.264. However I can not add a stream without creating an AVFormatContext. I can not create an AVFormatContext because 264 files does not have a container,they are just raw video ?, as far as I know.
I have tried the way in decoding_encoding.c which uses fwrite. However that example was for mpeg-2 codec and when I try to adapt that code to H264/AVC codec, I got "floating point division by zero" error from mediainfo and moreover, some of the properties of the video was not showing (such as FPS & playtime & quality factor). I think it has to do with the "endcode" the example adds at the end of the code. It is for mpeg-2. ( uint8_t endcode[] = 0, 0, 1, 0xb7 ; )
Anyway, I would love to get a startpoint for this task. I have managed to come this far by using internet resources ( quite few & outdated for ffmpeg) but now I'm stuck a little.
-
Revision b12e060b55 : Add speed feature to disable splitmv Added a speed feature in speed 1 to disabl
30 juin 2013, par Yunqing WangChanged Paths :
Modify /vp9/encoder/vp9_onyx_if.c
Modify /vp9/encoder/vp9_onyx_int.h
Add speed feature to disable splitmvAdded a speed feature in speed 1 to disable splitmv for HD (>=720)
clips. Test result on stdhd set : 0.3% psnr loss and 0.07% ssim
loss. Encoding speedup is 36%.(For reference : The test result on derf set showed 2% psnr loss
and 1.6% ssim loss. Encoding speedup is 34%. SPLITMV should be
enabled for small resolution videos.)Change-Id : I54f72b94f506c6d404b47c42e71acaa5374d6ee6
-
Add 2 pictures to video with durations ? [duplicate]
24 juin 2013, par jesperThis question already has an answer here :
I am trying to add 2 different images into a video with ffmpeg.
image1.jpg should show the first 10 seconds of the movie and youtubeLOL.png should show the next 6 minutes of the video.
So the command should tell us also to repeat the pictures to get a length for 6 minutes and 10 seconds. How can i do this ? I have tried this :
(It's not even working)
passthru("ffmpeg -f image2 -loop 1 -vframes 100 -i /home/psafari/public_html/youtube_images/movie_" . $id . ".jpg -vcodec mpeg4 /home/psafari/public_html/youtube_videos/movie_" . time().".avi");Here is output :
FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6) configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab libavutil 50.15. 1 / 50.15. 1 libavcodec 52.72. 2 / 52.72. 2 libavformat 52.64. 2 / 52.64. 2 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.19. 0 / 1.19. 0 libswscale 0.11. 0 / 0.11. 0 libpostproc 51. 2. 0 / 51. 2. 0
Invalid value '1' for option 'loop'output memcode
MEncoder SVN-r31628-4.4.6 (C) 2000-2010 MPlayer Team
get_path("config") problem
success: format: 0 data: 0x0 - 0x1251b
libavformat file format detected.
[lavf] stream 0: video (h264), -vid 0
VIDEO: [H264] 540x800 24bpp 25.000 fps 116.3 kbps (14.2 kbyte/s)
[V] filefmt:44 fourcc:0x34363248 size:540x800 fps:25.000 ftime:=0.0400
videocodec: framecopy (540x800 24bpp fourcc=34363248)
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos: 0.0s 1f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
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Pos: 3.0s 76f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [187:0]
Pos: 3.1s 77f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [185:0]
Pos: 3.1s 78f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [183:0]
Pos: 3.2s 79f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [180:0]
Pos: 3.2s 80f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [178:0]
Pos: 3.2s 81f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [176:0]
Pos: 3.3s 82f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [174:0]
Pos: 3.3s 83f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [172:0]
Pos: 3.4s 84f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [170:0]
Pos: 3.4s 85f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [168:0]
Pos: 3.4s 86f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [166:0]
Pos: 3.5s 87f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [164:0]
Pos: 3.5s 88f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [162:0]
Pos: 3.6s 89f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [161:0]
Pos: 3.6s 90f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [159:0]
Pos: 3.6s 91f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [157:0]
Pos: 3.7s 92f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [156:0]
Pos: 3.7s 93f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [154:0]
Pos: 3.8s 94f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [152:0]
Pos: 3.8s 95f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [151:0]
Pos: 3.8s 96f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [149:0]
Pos: 3.9s 97f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [148:0]
Pos: 3.9s 98f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [146:0]
Pos: 4.0s 99f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [145:0]
Pos: 4.0s 100f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [144:0]
Pos: 4.0s 101f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [142:0]
Pos: 4.1s 102f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [141:0]
Pos: 4.1s 103f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [140:0]
Pos: 4.2s 104f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [138:0]
Pos: 4.2s 105f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [137:0]
Pos: 4.2s 106f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [136:0]
Pos: 4.3s 107f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [135:0]
Pos: 4.3s 108f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [133:0]
Pos: 4.4s 109f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [132:0]
Pos: 4.4s 110f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [131:0]
Pos: 4.4s 111f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [130:0]
Pos: 4.5s 112f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [129:0]
Pos: 4.5s 113f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [128:0]
Pos: 4.6s 114f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [127:0]
Pos: 4.6s 115f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [126:0]
Pos: 4.6s 116f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [124:0]
Pos: 4.7s 117f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [123:0]
Pos: 4.7s 118f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [122:0]
Pos: 4.8s 119f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [121:0]
Pos: 4.8s 120f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [120:0]
Pos: 4.8s 121f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [119:0]
Pos: 4.9s 122f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [119:0]
Pos: 4.9s 123f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [118:0]
Pos: 5.0s 124f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [117:0]
Pos: 5.0s 125f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [116:0]
success: format: 0 data: 0x0 - 0x9daf8
libavformat file format detected.
[lavf] stream 0: video (h264), -vid 0
VIDEO: [H264] 640x400 24bpp 25.000 fps 21.8 kbps ( 2.7 kbyte/s)
[V] filefmt:44 fourcc:0x34363248 size:640x400 fps:25.000 ftime:=0.0400
videocodec: framecopy (540x800 24bpp fourcc=34363248)
videocodec: framecopy (640x400 24bpp fourcc=34363248)
All video files must have identical fps, resolution, and codec for -ovc copy.
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