Yea, how it is supposed to happen isn't complicated. To be of any help, I have to wrap my mind around how FFmpeg currently times the output stream. That mechanism currently does not produce as stable of a transmission rate as multiplexer and decoder hardware requires. Since there is a bounty available for this, it would be nice if someone more qualified could tackle this problem. Until someone steps up, I will be poking at it from my end. I am used to reading c++ intead of c code, so my reading is still a little slow. Fixing this problem will open up new possibilities on how I can use FFmpeg.
Zach On Wed, Nov 18, 2015 at 9:03 AM, Michael Niedermayer <mich...@niedermayer.cc > wrote: > On Tue, Nov 17, 2015 at 03:06:27PM -0800, Zach Swena wrote: > > Hi Pavel, > > > > I can confirm that there is a problem with the UDP packet engine in > > FFmpeg. FFmpeg has excessive jitter in it's UDP streaming output to the > > point where hardware decoders can't handle it. My solution was to buffer > > to disk and have my own program read and send the datagrams via a very > > tight event loop. While increasing the PCR period is not a bad thing, > > FFmpeg really should stream at a more consistant rate. Can someone > explain > > the theory behind how the UDP rate control is currently implemented in > > FFmpeg? PCR sounds like a good way to tell when to send a packet, except > > not every packet contains one. If FFmpeg uses PCR to tell how long to > wait > > to send a packet, then do the packets in between go at line speed? I > plan > > on taking a look at the code that does this, but I would really > appreciate > > it if someone who knows the code could explain the theory as I usually > deal > > with a slightly different dev setup. > > i suggest you read the mpeg specs, they detail when things should be > sent down to each byte IIRC > also IIRC its not that complicated, more like timestamp + bytepos/rate > > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > I know you won't believe me, but the highest form of Human Excellence is > to question oneself and others. -- Socrates > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
