StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
13457773
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2012-11-19T16:13:53.603
FavoriteCount
0
LastActivityDate
2012-11-19T16:13:53.603
LastEditDate
LastEditorUserId
0
OwnerUserId
29773
ParentId
9251747
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
<p>Here's how I do it. What I found was when receiving H264 the framerate in the stream is not correct. It sends 1/90000 Timebase. I skip initializing the new stream from the incoming stream and just copy certain parameters. The incoming r_frame_rate should be accurate if max_analyze_frames works correctly.</p> <pre><code>#include <stdio.h> #include <stdlib.h> #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libavformat/avio.h> #include <sys/time.h> time_t get_time() { struct timeval tv; gettimeofday( &tv, NULL ); return tv.tv_sec; } int main( int argc, char* argv[] ) { AVFormatContext *ifcx = NULL; AVInputFormat *ifmt; AVCodecContext *iccx; AVCodec *icodec; AVStream *ist; int i_index; time_t timenow, timestart; int got_key_frame = 0; AVFormatContext *ofcx; AVOutputFormat *ofmt; AVCodecContext *occx; AVCodec *ocodec; AVStream *ost; int o_index; AVPacket pkt; int ix; const char *sProg = argv[ 0 ]; const char *sFileInput; const char *sFileOutput; int bRunTime; if ( argc != 4 ) { printf( "Usage: %s url outfile runtime\n", sProg ); return EXIT_FAILURE; } sFileInput = argv[ 1 ]; sFileOutput = argv[ 2 ]; bRunTime = atoi( argv[ 3 ] ); // Initialize library av_log_set_level( AV_LOG_DEBUG ); av_register_all(); avcodec_register_all(); avformat_network_init(); // // Input // //open rtsp if ( avformat_open_input( &ifcx, sFileInput, NULL, NULL) != 0 ) { printf( "ERROR: Cannot open input file\n" ); return EXIT_FAILURE; } if ( avformat_find_stream_info( ifcx, NULL ) < 0 ) { printf( "ERROR: Cannot find stream info\n" ); avformat_close_input( &ifcx ); return EXIT_FAILURE; } snprintf( ifcx->filename, sizeof( ifcx->filename ), "%s", sFileInput ); //search video stream i_index = -1; for ( ix = 0; ix < ifcx->nb_streams; ix++ ) { iccx = ifcx->streams[ ix ]->codec; if ( iccx->codec_type == AVMEDIA_TYPE_VIDEO ) { ist = ifcx->streams[ ix ]; i_index = ix; break; } } if ( i_index < 0 ) { printf( "ERROR: Cannot find input video stream\n" ); avformat_close_input( &ifcx ); return EXIT_FAILURE; } // // Output // //open output file ofmt = av_guess_format( NULL, sFileOutput, NULL ); ofcx = avformat_alloc_context(); ofcx->oformat = ofmt; avio_open2( &ofcx->pb, sFileOutput, AVIO_FLAG_WRITE, NULL, NULL ); // Create output stream //ost = avformat_new_stream( ofcx, (AVCodec *) iccx->codec ); ost = avformat_new_stream( ofcx, NULL ); avcodec_copy_context( ost->codec, iccx ); ost->sample_aspect_ratio.num = iccx->sample_aspect_ratio.num; ost->sample_aspect_ratio.den = iccx->sample_aspect_ratio.den; // Assume r_frame_rate is accurate ost->r_frame_rate = ist->r_frame_rate; ost->avg_frame_rate = ost->r_frame_rate; ost->time_base = av_inv_q( ost->r_frame_rate ); ost->codec->time_base = ost->time_base; avformat_write_header( ofcx, NULL ); snprintf( ofcx->filename, sizeof( ofcx->filename ), "%s", sFileOutput ); //start reading packets from stream and write them to file av_dump_format( ifcx, 0, ifcx->filename, 0 ); av_dump_format( ofcx, 0, ofcx->filename, 1 ); timestart = timenow = get_time(); ix = 0; //av_read_play(context);//play RTSP (Shouldn't need this since it defaults to playing on connect) av_init_packet( &pkt ); while ( av_read_frame( ifcx, &pkt ) >= 0 && timenow - timestart <= bRunTime ) { if ( pkt.stream_index == i_index ) { //packet is video // Make sure we start on a key frame if ( timestart == timenow && ! ( pkt.flags & AV_PKT_FLAG_KEY ) ) { timestart = timenow = get_time(); continue; } got_key_frame = 1; pkt.stream_index = ost->id; pkt.pts = ix++; pkt.dts = pkt.pts; av_interleaved_write_frame( ofcx, &pkt ); } av_free_packet( &pkt ); av_init_packet( &pkt ); timenow = get_time(); } av_read_pause( ifcx ); av_write_trailer( ofcx ); avio_close( ofcx->pb ); avformat_free_context( ofcx ); avformat_network_deinit(); return EXIT_SUCCESS; } </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PORecord RTSP stream with FFmpeg libavformat
  singulars
  PostTypePostTypeId
  PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USRyan Ayers
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
  singulars
  PostPostId
  PO
  UserUserId
  This table or related slice is empty.
  VoteTypeVoteTypeId
  VTUpMod
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.