Hi, I am using ffmpeg 2.5.3 as an RTSP client and found a few missing pieces, which the following series of patches should address. I used some test files streamed with an RTSP server on the xenomai.org server, the files are available for download by replacing rtsp://xenomai.org:8554 with https://xenomai.org in the URL
- support for depacketization of AC3 RTP frames is missing, patch 1 adds it, following https://tools.ietf.org/html/draft-ietf-avt-rtp-ac3-07 it can be tested with: rtsp://xenomai.org:8554/video-tests/big_buck_bunny/BigBuckBunny_DivX_HD720p_ASP.divx (using audio track 2, as audio track 1 uses mp3adu) - support for receiving sub-titles via RTP is missing. live555 uses the T140 RTP packetization for that (RFC 4103), and vlc decodes subrip subtitles sent that way. Patch 2 and 3 implement a compatible solution, meaning that the AV_CODEC_ID_SUBRIP is used for T140 tracks, of course another codec id could be used. These patches can be tested with: rtsp://xenomai.org:8554/video-tests/sintel/sintel-1280-surround.mp4 - support for receiving MP3ADU audio via RTP, following RFC 3119 is missing. Patch 4 modifies the MPEG audio parser to decode MP3ADU headers in MP3ADU frames only when the PARSER_FLAG_COMPLETE_FRAMES is set, because for some reason the parser creates incorrect frames when trying to parse MP3ADU frames fully with the test file I used. Patch 5 implements the depacketizer. These patches can be tested with: rtsp://xenomai.org:8554/video-tests/big_buck_bunny/BigBuckBunny_DivX_HD720p_ASP.divx (this time using audio track 1) - support for reassembly of fragmented AAC frames via RTP is missing. Patch 6 modifies libavformat/rtpdec_mpeg4.c to add that support. This patch can be tested with: rtsp://xenomai.org:8554/video-tests/sintel/sintel-1280-surround.mp4 Without this patch, fragmented AAC frames are silently dropped, which causes underruns in the audio driver when playing the test file. - support for parsing the lang attribute in RTSP tracks is missing. Patch 7 adds it. This patch can be tested with: rtsp://xenomai.org:8554/video-tests/sintel/sintel-1280-surround.mp4 Launching ffprobe with this URL should display the languages of the audio track and subtitle tracks. Thanks in advance for your review. Regards. -- Gilles. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
