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MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 is the first MediaSPIP stable release.
Its official release date is June 21, 2013 and is announced here.
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Support audio et vidéo HTML5
10 avril 2011MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...) -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
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Sur d’autres sites (15696)
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Screen Recording with FFmpeg-Lib with c++
27 janvier 2020, par BaschdelI’m trying to record the whole desktop stream with FFmpeg on Windows.
I found a working example here. The Problem is that some og the functions depricated. So I tried to replace them with the updated ones.But there are some slight problems. The error "has triggered a breakpoint." occurse and also "not able to read the location."
The bigger problem is that I don’t know if this is the right way to do this..My code looks like this :
using namespace std;
/* initialize the resources*/
Recorder::Recorder()
{
av_register_all();
avcodec_register_all();
avdevice_register_all();
cout<<"\nall required functions are registered successfully";
}
/* uninitialize the resources */
Recorder::~Recorder()
{
avformat_close_input(&pAVFormatContext);
if( !pAVFormatContext )
{
cout<<"\nfile closed sucessfully";
}
else
{
cout<<"\nunable to close the file";
exit(1);
}
avformat_free_context(pAVFormatContext);
if( !pAVFormatContext )
{
cout<<"\navformat free successfully";
}
else
{
cout<<"\nunable to free avformat context";
exit(1);
}
}
/* establishing the connection between camera or screen through its respective folder */
int Recorder::openCamera()
{
value = 0;
options = NULL;
pAVFormatContext = NULL;
pAVFormatContext = avformat_alloc_context();//Allocate an AVFormatContext.
openScreen(pAVFormatContext);
/* set frame per second */
value = av_dict_set( &options,"framerate","30",0 );
if(value < 0)
{
cout<<"\nerror in setting dictionary value";
exit(1);
}
value = av_dict_set( &options, "preset", "medium", 0 );
if(value < 0)
{
cout<<"\nerror in setting preset values";
exit(1);
}
// value = avformat_find_stream_info(pAVFormatContext,NULL);
if(value < 0)
{
cout<<"\nunable to find the stream information";
exit(1);
}
VideoStreamIndx = -1;
/* find the first video stream index . Also there is an API available to do the below operations */
for(int i = 0; i < pAVFormatContext->nb_streams; i++ ) // find video stream posistion/index.
{
if( pAVFormatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO )
{
VideoStreamIndx = i;
break;
}
}
if( VideoStreamIndx == -1)
{
cout<<"\nunable to find the video stream index. (-1)";
exit(1);
}
// assign pAVFormatContext to VideoStreamIndx
pAVCodecContext = pAVFormatContext->streams[VideoStreamIndx]->codec;
pAVCodec = avcodec_find_decoder(pAVCodecContext->codec_id);
if( pAVCodec == NULL )
{
cout<<"\nunable to find the decoder";
exit(1);
}
value = avcodec_open2(pAVCodecContext , pAVCodec , NULL);//Initialize the AVCodecContext to use the given AVCodec.
if( value < 0 )
{
cout<<"\nunable to open the av codec";
exit(1);
}
}
/* initialize the video output file and its properties */
int Recorder::init_outputfile()
{
outAVFormatContext = NULL;
value = 0;
output_file = "output.mp4";
avformat_alloc_output_context2(&outAVFormatContext, NULL, NULL, output_file);
if (!outAVFormatContext)
{
cout<<"\nerror in allocating av format output context";
exit(1);
}
/* Returns the output format in the list of registered output formats which best matches the provided parameters, or returns NULL if there is no match. */
output_format = av_guess_format(NULL, output_file ,NULL);
if( !output_format )
{
cout<<"\nerror in guessing the video format. try with correct format";
exit(1);
}
video_st = avformat_new_stream(outAVFormatContext ,NULL);
if( !video_st )
{
cout<<"\nerror in creating a av format new stream";
exit(1);
}
if (codec_id == AV_CODEC_ID_H264)
{
av_opt_set(outAVCodecContext->priv_data, "preset", "slow", 0);
}
outAVCodec = avcodec_find_encoder(AV_CODEC_ID_MPEG4);
if (!outAVCodec)
{
cout << "\nerror in finding the av codecs. try again with correct codec";
exit(1);
}
outAVCodecContext = avcodec_alloc_context3(outAVCodec);
if( !outAVCodecContext )
{
cout<<"\nerror in allocating the codec contexts";
exit(1);
}
/* set property of the video file */
outAVCodecContext = video_st->codec;
outAVCodecContext->codec_id = AV_CODEC_ID_MPEG4;// AV_CODEC_ID_MPEG4; // AV_CODEC_ID_H264 // AV_CODEC_ID_MPEG1VIDEO
outAVCodecContext->codec_type = AVMEDIA_TYPE_VIDEO;
outAVCodecContext->pix_fmt = AV_PIX_FMT_YUV420P;
outAVCodecContext->bit_rate = 400000; // 2500000
outAVCodecContext->width = 1920;
outAVCodecContext->height = 1080;
outAVCodecContext->gop_size = 3;
outAVCodecContext->max_b_frames = 2;
outAVCodecContext->time_base.num = 1;
outAVCodecContext->time_base.den = 30; //15fps
/* Some container formats (like MP4) require global headers to be present
Mark the encoder so that it behaves accordingly. */
if ( outAVFormatContext->oformat->flags & AVFMT_GLOBALHEADER)
{
outAVCodecContext->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
value = avcodec_open2(outAVCodecContext, outAVCodec, NULL);
if( value < 0)
{
cout<<"\nerror in opening the avcodec";
exit(1);
}
/* create empty video file */
if ( !(outAVFormatContext->flags & AVFMT_NOFILE) )
{
if( avio_open2(&outAVFormatContext->pb , output_file , AVIO_FLAG_WRITE ,NULL, NULL) < 0 )
{
cout<<"\nerror in creating the video file";
exit(1);
}
}
if(!outAVFormatContext->nb_streams)
{
cout<<"\noutput file dose not contain any stream";
exit(1);
}
/* imp: mp4 container or some advanced container file required header information*/
value = avformat_write_header(outAVFormatContext , &options);
if(value < 0)
{
cout<<"\nerror in writing the header context";
exit(1);
}
/*
// uncomment here to view the complete video file informations
cout<<"\n\nOutput file information :\n\n";
av_dump_format(outAVFormatContext , 0 ,output_file ,1);
*/
}
int Recorder::stop() {
threading = false;
demux->join();
rescale->join();
mux->join();
return 0;
}
int Recorder::start() {
initVideoThreads();
return 0;
}
int Recorder::initVideoThreads() {
demux = new thread(&Recorder::demuxVideoStream, this, pAVCodecContext, pAVFormatContext, VideoStreamIndx);
rescale = new thread(&Recorder::rescaleVideoStream, this, pAVCodecContext, outAVCodecContext);
demux = new thread(&Recorder::encodeVideoStream, this, outAVCodecContext);
return 0;
}
void Recorder::demuxVideoStream(AVCodecContext* codecContext, AVFormatContext* formatContext, int streamIndex)
{
// init packet
AVPacket* packet = (AVPacket*)av_malloc(sizeof(AVPacket));
av_init_packet(packet);
int ctr = 0;
while (threading)
{
if (av_read_frame(formatContext, packet) < 0) {
exit(1);
}
if (packet->stream_index == streamIndex)
{
int return_value; // = 0;
ctr++;
do
{
return_value = avcodec_send_packet(codecContext, packet);
} while (return_value == AVERROR(EAGAIN) && threading);
//int i = avcodec_send_packet(codecContext, packet);
if (return_value < 0 && threading) { // call Decoder
cout << "unable to decode video";
exit(1);
}
}
}
avcodec_send_packet(codecContext, NULL); // flush decoder
// return 0;
}
void Recorder::rescaleVideoStream(AVCodecContext* inCodecContext, AVCodecContext* outCodecContext)
{
bool closing = false;
AVFrame* inFrame = av_frame_alloc();
if (!inFrame)
{
cout << "\nunable to release the avframe resources";
exit(1);
}
int nbytes = av_image_get_buffer_size(outAVCodecContext->pix_fmt, outAVCodecContext->width, outAVCodecContext->height, 32);
uint8_t* video_outbuf = (uint8_t*)av_malloc(nbytes);
if (video_outbuf == NULL)
{
cout << "\nunable to allocate memory";
exit(1);
}
AVFrame* outFrame = av_frame_alloc();//Allocate an AVFrame and set its fields to default values.
if (!outFrame)
{
cout << "\nunable to release the avframe resources for outframe";
exit(1);
}
// Setup the data pointers and linesizes based on the specified image parameters and the provided array.
int value = av_image_fill_arrays(outFrame->data, outFrame->linesize, video_outbuf, AV_PIX_FMT_YUV420P, outAVCodecContext->width, outAVCodecContext->height, 1); // returns : the size in bytes required for src
if (value < 0)
{
cout << "\nerror in filling image array";
}
int ctr = 0;
while (threading || !closing) {
int value = avcodec_receive_frame(inCodecContext, inFrame);
if (value == 0) {
ctr++;
SwsContext* swsCtx_ = sws_getContext(inCodecContext->width,
inCodecContext->height,
inCodecContext->pix_fmt,
outAVCodecContext->width,
outAVCodecContext->height,
outAVCodecContext->pix_fmt,
SWS_BICUBIC, NULL, NULL, NULL);
sws_scale(swsCtx_, inFrame->data, inFrame->linesize, 0, inCodecContext->height, outFrame->data, outFrame->linesize);
int return_value;
do
{
return_value = avcodec_send_frame(outCodecContext, outFrame);
} while (return_value == AVERROR(EAGAIN) && threading);
}
closing = (value == AVERROR_EOF);
}
avcodec_send_frame(outCodecContext, NULL);
// av_free(video_outbuf);
// return 0;
}
void Recorder::encodeVideoStream(AVCodecContext* codecContext)
{
bool closing = true;
AVPacket* packet = (AVPacket*)av_malloc(sizeof(AVPacket));
av_init_packet(packet);
int ctr = 0;
while (threading || !closing) {
packet->data = NULL; // packet data will be allocated by the encoder
packet->size = 0;
ctr++;
int value = avcodec_receive_packet(codecContext, packet);
if (value == 0) {
if (packet->pts != AV_NOPTS_VALUE)
packet->pts = av_rescale_q(packet->pts, video_st->codec->time_base, video_st->time_base);
if (packet->dts != AV_NOPTS_VALUE)
packet->dts = av_rescale_q(packet->dts, video_st->codec->time_base, video_st->time_base);
//printf("Write frame %3d (size= %2d)\n", j++, packet->size / 1000);
if (av_write_frame(outAVFormatContext, packet) != 0)
{
cout << "\nerror in writing video frame";
}
}
closing = (value == AVERROR_EOF);
}
value = av_write_trailer(outAVFormatContext);
if (value < 0)
{
cout << "\nerror in writing av trailer";
exit(1);
}
// av_free(packet);
// return 0;
}
int Recorder::openScreen(AVFormatContext* pFormatCtx) {
/*
X11 video input device.
To enable this input device during configuration you need libxcb installed on your system. It will be automatically detected during configuration.
This device allows one to capture a region of an X11 display.
refer : https://www.ffmpeg.org/ffmpeg-devices.html#x11grab
*/
/* current below is for screen recording. to connect with camera use v4l2 as a input parameter for av_find_input_format */
pAVInputFormat = av_find_input_format("gdigrab");
//value = avformat_open_input(&pAVFormatContext, ":0.0+10,250", pAVInputFormat, NULL);
value = avformat_open_input(&pAVFormatContext, "desktop", pAVInputFormat, NULL);
if (value != 0)
{
cout << "\nerror in opening input device";
exit(1);
}
return 0;
} -
Screenrecorder application output video resolution issues [closed]
23 juin 2022, par JessieKUsing Github code for ScreenRecorder on Linux
Everything works fine, besides the resolution of output video.
Tried to play with setting, quality has significantly improved, but still no way to change resolution.
I need to get output video with the same size as input video


using namespace std;

 /* initialize the resources*/
 ScreenRecorder::ScreenRecorder()
 {
 
 av_register_all();
 avcodec_register_all();
 avdevice_register_all();
 cout<<"\nall required functions are registered successfully";
 }
 
 /* uninitialize the resources */
 ScreenRecorder::~ScreenRecorder()
 {
 
 avformat_close_input(&pAVFormatContext);
 if( !pAVFormatContext )
 {
 cout<<"\nfile closed sucessfully";
 }
 else
 {
 cout<<"\nunable to close the file";
 exit(1);
 }
 
 avformat_free_context(pAVFormatContext);
 if( !pAVFormatContext )
 {
 cout<<"\navformat free successfully";
 }
 else
 {
 cout<<"\nunable to free avformat context";
 exit(1);
 }
 
 }
 
 /* function to capture and store data in frames by allocating required memory and auto deallocating the memory. */
 int ScreenRecorder::CaptureVideoFrames()
 {
 int flag;
 int frameFinished;//when you decode a single packet, you still don't have information enough to have a frame [depending on the type of codec, some of them //you do], when you decode a GROUP of packets that represents a frame, then you have a picture! that's why frameFinished will let //you know you decoded enough to have a frame.
 
 int frame_index = 0;
 value = 0;
 
 pAVPacket = (AVPacket *)av_malloc(sizeof(AVPacket));
 av_init_packet(pAVPacket);
 
 pAVFrame = av_frame_alloc();
 if( !pAVFrame )
 {
 cout<<"\nunable to release the avframe resources";
 exit(1);
 }
 
 outFrame = av_frame_alloc();//Allocate an AVFrame and set its fields to default values.
 if( !outFrame )
 {
 cout<<"\nunable to release the avframe resources for outframe";
 exit(1);
 }
 
 int video_outbuf_size;
 int nbytes = av_image_get_buffer_size(outAVCodecContext->pix_fmt,outAVCodecContext->width,outAVCodecContext->height,32);
 uint8_t *video_outbuf = (uint8_t*)av_malloc(nbytes);
 if( video_outbuf == NULL )
 {
 cout<<"\nunable to allocate memory";
 exit(1);
 }
 
 // Setup the data pointers and linesizes based on the specified image parameters and the provided array.
 value = av_image_fill_arrays( outFrame->data, outFrame->linesize, video_outbuf , AV_PIX_FMT_YUV420P, outAVCodecContext->width,outAVCodecContext->height,1 ); // returns : the size in bytes required for src
 if(value < 0)
 {
 cout<<"\nerror in filling image array";
 }
 
 SwsContext* swsCtx_ ;
 
 // Allocate and return swsContext.
 // a pointer to an allocated context, or NULL in case of error
 // Deprecated : Use sws_getCachedContext() instead.
 swsCtx_ = sws_getContext(pAVCodecContext->width,
 pAVCodecContext->height,
 pAVCodecContext->pix_fmt,
 outAVCodecContext->width,
 outAVCodecContext->height,
 outAVCodecContext->pix_fmt,
 SWS_BICUBIC, NULL, NULL, NULL);
 
 
 int ii = 0;
 int no_frames = 100;
 cout<<"\nenter No. of frames to capture : ";
 cin>>no_frames;
 
 AVPacket outPacket;
 int j = 0;
 
 int got_picture;
 
 while( av_read_frame( pAVFormatContext , pAVPacket ) >= 0 )
 {
 if( ii++ == no_frames )break;
 if(pAVPacket->stream_index == VideoStreamIndx)
 {
 value = avcodec_decode_video2( pAVCodecContext , pAVFrame , &frameFinished , pAVPacket );
 if( value < 0)
 {
 cout<<"unable to decode video";
 }
 
 if(frameFinished)// Frame successfully decoded :)
 {
 sws_scale(swsCtx_, pAVFrame->data, pAVFrame->linesize,0, pAVCodecContext->height, outFrame->data,outFrame->linesize);
 av_init_packet(&outPacket);
 outPacket.data = NULL; // packet data will be allocated by the encoder
 outPacket.size = 0;
 
 avcodec_encode_video2(outAVCodecContext , &outPacket ,outFrame , &got_picture);
 
 if(got_picture)
 {
 if(outPacket.pts != AV_NOPTS_VALUE)
 outPacket.pts = av_rescale_q(outPacket.pts, video_st->codec->time_base, video_st->time_base);
 if(outPacket.dts != AV_NOPTS_VALUE)
 outPacket.dts = av_rescale_q(outPacket.dts, video_st->codec->time_base, video_st->time_base);
 
 printf("Write frame %3d (size= %2d)\n", j++, outPacket.size/1000);
 if(av_write_frame(outAVFormatContext , &outPacket) != 0)
 {
 cout<<"\nerror in writing video frame";
 }
 
 av_packet_unref(&outPacket);
 } // got_picture
 
 av_packet_unref(&outPacket);
 } // frameFinished
 
 }
 }// End of while-loop


One part of two parts is above...Actually original app seem to record video of same size as does my application, but still it has not any use



Second part of the code


av_free(video_outbuf);

}

/* establishing the connection between camera or screen through its respective folder */
int ScreenRecorder::openCamera()
{

 value = 0;
 options = NULL;
 pAVFormatContext = NULL;

 pAVFormatContext = avformat_alloc_context();//Allocate an AVFormatContext.
/*

X11 video input device.
To enable this input device during configuration you need libxcb installed on your system. It will be automatically detected during configuration.
This device allows one to capture a region of an X11 display. 
refer : https://www.ffmpeg.org/ffmpeg-devices.html#x11grab
*/
 /* current below is for screen recording. to connect with camera use v4l2 as a input parameter for av_find_input_format */ 
 pAVInputFormat = av_find_input_format("x11grab");
 value = avformat_open_input(&pAVFormatContext, ":0.0+10,250", pAVInputFormat, NULL);
 if(value != 0)
 {
 cout<<"\nerror in opening input device";
 exit(1);
 }

 /* set frame per second */
 value = av_dict_set( &options,"framerate","30",0 );
 if(value < 0)
 {
 cout<<"\nerror in setting dictionary value";
 exit(1);
 }

 value = av_dict_set( &options, "preset", "medium", 0 );
 if(value < 0)
 {
 cout<<"\nerror in setting preset values";
 exit(1);
 }

// value = avformat_find_stream_info(pAVFormatContext,NULL);
 if(value < 0)
 {
 cout<<"\nunable to find the stream information";
 exit(1);
 }

 VideoStreamIndx = -1;

 /* find the first video stream index . Also there is an API available to do the below operations */
 for(int i = 0; i < pAVFormatContext->nb_streams; i++ ) // find video stream posistion/index.
 {
 if( pAVFormatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO )
 {
 VideoStreamIndx = i;
 break;
 }

 } 

 if( VideoStreamIndx == -1)
 {
 cout<<"\nunable to find the video stream index. (-1)";
 exit(1);
 }

 // assign pAVFormatContext to VideoStreamIndx
 pAVCodecContext = pAVFormatContext->streams[VideoStreamIndx]->codec;

 pAVCodec = avcodec_find_decoder(pAVCodecContext->codec_id);
 if( pAVCodec == NULL )
 {
 cout<<"\nunable to find the decoder";
 exit(1);
 }

 value = avcodec_open2(pAVCodecContext , pAVCodec , NULL);//Initialize the AVCodecContext to use the given AVCodec.
 if( value < 0 )
 {
 cout<<"\nunable to open the av codec";
 exit(1);
 }
}

/* initialize the video output file and its properties */
int ScreenRecorder::init_outputfile()
{
 outAVFormatContext = NULL;
 value = 0;
 output_file = "../media/output.mp4";

 avformat_alloc_output_context2(&outAVFormatContext, NULL, NULL, output_file);
 if (!outAVFormatContext)
 {
 cout<<"\nerror in allocating av format output context";
 exit(1);
 }

/* Returns the output format in the list of registered output formats which best matches the provided parameters, or returns NULL if there is no match. */
 output_format = av_guess_format(NULL, output_file ,NULL);
 if( !output_format )
 {
 cout<<"\nerror in guessing the video format. try with correct format";
 exit(1);
 }

 video_st = avformat_new_stream(outAVFormatContext ,NULL);
 if( !video_st )
 {
 cout<<"\nerror in creating a av format new stream";
 exit(1);
 }

 outAVCodecContext = avcodec_alloc_context3(outAVCodec);
 if( !outAVCodecContext )
 {
 cout<<"\nerror in allocating the codec contexts";
 exit(1);
 }

 /* set property of the video file */
 outAVCodecContext = video_st->codec;
 outAVCodecContext->codec_id = AV_CODEC_ID_MPEG4;// AV_CODEC_ID_MPEG4; // AV_CODEC_ID_H264 // AV_CODEC_ID_MPEG1VIDEO
 outAVCodecContext->codec_type = AVMEDIA_TYPE_VIDEO;
 outAVCodecContext->pix_fmt = AV_PIX_FMT_YUV420P;
 outAVCodecContext->bit_rate = 2500000; // 2500000
 outAVCodecContext->width = 1920;
 outAVCodecContext->height = 1080;
 outAVCodecContext->gop_size = 3;
 outAVCodecContext->max_b_frames = 2;
 outAVCodecContext->time_base.num = 1;
 outAVCodecContext->time_base.den = 30; // 15fps

 {
 av_opt_set(outAVCodecContext->priv_data, "preset", "slow", 0);
 }

 outAVCodec = avcodec_find_encoder(AV_CODEC_ID_MPEG4);
 if( !outAVCodec )
 {
 cout<<"\nerror in finding the av codecs. try again with correct codec";
 exit(1);
 }

 /* Some container formats (like MP4) require global headers to be present
 Mark the encoder so that it behaves accordingly. */

 if ( outAVFormatContext->oformat->flags & AVFMT_GLOBALHEADER)
 {
 outAVCodecContext->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
 }

 value = avcodec_open2(outAVCodecContext, outAVCodec, NULL);
 if( value < 0)
 {
 cout<<"\nerror in opening the avcodec";
 exit(1);
 }

 /* create empty video file */
 if ( !(outAVFormatContext->flags & AVFMT_NOFILE) )
 {
 if( avio_open2(&outAVFormatContext->pb , output_file , AVIO_FLAG_WRITE ,NULL, NULL) < 0 )
 {
 cout<<"\nerror in creating the video file";
 exit(1);
 }
 }

 if(!outAVFormatContext->nb_streams)
 {
 cout<<"\noutput file dose not contain any stream";
 exit(1);
 }

 /* imp: mp4 container or some advanced container file required header information*/
 value = avformat_write_header(outAVFormatContext , &options);
 if(value < 0)
 {
 cout<<"\nerror in writing the header context";
 exit(1);
 }


 cout<<"\n\nOutput file information :\n\n";
 av_dump_format(outAVFormatContext , 0 ,output_file ,1);


Github link https://github.com/abdullahfarwees/screen-recorder-ffmpeg-cpp


-
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