Yes, that’s what I am doing. I am repacketizing h264 and hevc without inspection of the stream itself. RTSP over tcp can transmit rtp packets up to 64k. Some cameras utilize this to reduce fragmentation overhead but those large packets need to be fragmented for udp rebroadcast on typical network mtu.
I could inspect the stream for sps and then parse the dimensions out of there, or maybe set some dummy values on the rtp encoder somehow and work around this. But neither of those seemed like proper solutions given rtp doesn’t need to know the steam dimensions for all but 2 codecs. On Fri, Mar 28, 2025 at 4:39 PM Michael Niedermayer <[email protected]> wrote: > Hi > > On Wed, Mar 26, 2025 at 01:13:13PM -0700, [email protected] wrote: > > From: Koushik Dutta <[email protected]> > > > > Not all rtp formats require the video dimensions to be available > > up front. H264 and HEVC will send them as stream parameters. > > The flag is restrictive and prevents RTP repacketization > > without parsing the codec information out of the stream. > > > > This change checks to see if the codec parameters are available > > on the rtp formats that need it. > > > > Signed-off-by: Koushik Dutta <[email protected]> > > --- > > libavformat/rtpenc.c | 10 +++++++++- > > 1 file changed, 9 insertions(+), 1 deletion(-) > > In general when muxing a stream, the dimensions are known > > Can you explain what you are doing with rtpenc that lacks > known dimensions ? > is this some sort of low latency remuxing ? > > thx > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > Some people wanted to paint the bikeshed green, some blue and some pink. > People argued and fought, when they finally agreed, only rust was left. > _______________________________________________ > ffmpeg-devel mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-devel mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
