On Wed, Jul 24, 2019 at 10:20:14AM +0200, Olivier Maignial wrote: > === PROBLEM === > > I was trying to record h264 + aac streams from an RTSP server to mp4 file. > using this command line: > ffmpeg -v verbose -y -i "rtsp://<ip>/my_resources" -codec copy -bsf:a > aac_adtstoasc test.mp4 > > FFmpeg then fail to record audio and output this logs: > [rtsp @ 0xcda1f0] The profile-level-id field size is invalid (40) > [rtsp @ 0xcda1f0] Error parsing AU headers > ... > [rtsp @ 0xcda1f0] Could not find codec parameters for stream 1 (Audio: > aac, 48000 Hz, 1 channels): unspecified sample format > > In SDP provided by my RTSP server I had this fmtp line: > a=fmtp:98 streamType=5; profile-level-id=40; mode=AAC-hbr; config=1188; > sizeLength=13; indexLength=3; indexDeltaLength=3; > > In FFmpeg code, I found a check introduced by commit > 24130234cd9dd733116d17b724ea4c8e12ce097a. It disallows values greater than 32 > for fmtp line parameters. > RFC-4566 (SDP: Session Description Protocol) do not give any limit of size on > interger parameters given in an fmtp line. > > However, In RFC-6416 (RTP Payload Format for MPEG-4 Audio/Visual Streams) > give examples of "profile-level-id" values for AAC, up to 55. > > === FIX === > > As each parameter may have its own min and max values > I propose to introduce a range for each parameter. > For this patch I used RFC-3640 and ISO/IEC 14496-1 as reference for validity > ranges. > > This patch fix my problem and I now can record my RTSP AAC stream to mp4. > It has passed the full fate tests suite sucessfully. > > Signed-off-by: Olivier Maignial <olivier.maign...@smile.fr> > --- > Changes v7 --> v8: > Indroduced a per parameter validity range
thanks, yes this should resolve the issue [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Complexity theory is the science of finding the exact solution to an approximation. Benchmarking OTOH is finding an approximation of the exact
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