[FFmpeg-user] RTP decoded video plays too fast
I am developing a SIP call recording app. To save conversations as playable media files, I has done the following: 1. Track SIP dialogs and save RTP media streams into custom .rtp files. The files have a header which contains stream encoding information (extracted form SDP payloads) followed by the RTP packets itself, saved consecutively and preceded w/ a 2 byte length field. 2. Developed a custom AVInputFormat. The format reads .rtp file header in its read_header method and sets stream codec and its parameters. It also creates RTPDemuxContext and RTPDynamicProtocolHandler instances. In its read_packet method, the format reads rtp packets and passes them to rtp demuxer. 3. To convert .rtp files to playable media, I use a simple command like below: > ffmpeg -i vp8-video.rtp -o vp8-video.flv The output contains the video as expected but it plays almost 2 times faster in VLC and widows media player. The problem exists w/ other output formats such as .avi or .mp4, too. Can anybody suggest what is going wrong? As RTP packets contain timing information, why ffmpeg decodes them in a faster rate? How I can fix the problem w/o using PTS filters? NOTE: The trans-coded audio streams do not have this problem and play at correct rate. Pls. keep me CC'ed as I am not registered to the list. Thanks. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] RTP decoded video plays too fast
Hi, I am developing a SIP call recording app. To save conversations as playable media files, I has done the following: 1. Track SIP dialogs and save RTP media streams into custom .rtp files. The files have a header which contains stream encoding information (extracted form SDP payloads) followed by the RTP packets itself, saved consecutively and preceded w/ a 2 byte length field. 2. Developed a custom AVInputFormat. The format reads .rtp file header in its read_header method and sets stream codec and its parameters. It also creates RTPDemuxContext and RTPDynamicProtocolHandler instances. In its read_packet method, the format reads rtp packets and passes them to rtp demuxer. 3. To convert .rtp files to playable media, I use a simple command like below: > ffmpeg -i vp8-video.rtp vp8-video.flv The output contains the video as expected but it plays almost 2 times faster in VLC and widows media player. The problem exists w/ other output formats such as .avi or .mp4, too. Can anybody suggest what is going wrong? As RTP packets contain timing information, why ffmpeg decodes them in a faster rate? How I can fix the problem w/o using PTS filters? NOTE: The trans-coded audio streams do not have this problem and play w/ right speed. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
