[FFmpeg-trac] #2748(avformat:new): Inconsistent UDP output packet size

[FFmpeg]

#2748: Inconsistent UDP output packet size
-------------------------------------+-------------------------------------
             Reporter:  lancey       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
             Keywords:  pkt_size     |  master
  packet size                        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 When outputting MPEG-TS to UDP and using the pkt_size option, ffmpeg does
 not produce output with constant packet size - instead, the option is used
 as a limit of maximum packet size. When looking at the sources, it's
 indeed a max packet size, but the docs just say "Set the size in bytes of
 UDP packets" - which is also the expected behavior according to me. Other
 software producing MPEG-TS over UDP/TCP (e.g. vlc, multicat, etc.) also
 behaves like that - output is constant packet-sized.
 Happens not only when transcoding, but when copying a stream as well.
 How to reproduce:
 {{{
 % ffmpeg -i input.ts -c:v copy -c:a copy -f mpegts
 udp://239.1.2.3:1234?pkt_size=1316
 ffmpeg version N-54435-g4943eff
 built on Jul  3 2013 23:19:37 with gcc 4.7 (Debian 4.7.2-5)
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2748>
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