[FFmpeg-trac] #2748(undetermined:open): Inconsistent UDP output packet size

FFmpeg trac at avcodec.org
Tue Feb 25 00:02:05 CET 2014


#2748: Inconsistent UDP output packet size
-------------------------------------+-------------------------------------
             Reporter:  lancey       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mpegts udp   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by caseynielson):

 You may reproduce the problem using the command line supplied in the
 original description.

 ffmpeg -re -i test.ts -c:v copy -c:a copy -f mpegts
 udp://239.101.102.103:3001?pkt_size=1316

 test.ts should contain valid MPEG TS content.

 The problem is observed using your favorite packet trace utility (I use
 tcpdump but wireshark may be easier to use).

 All IP UDP packets should be 1316 bytes (7 MPEG TS packets at length of
 188 bytes). As noted earlier ffmpeg occasionally outputs IP UDP packets
 containing fewer MPEG TS packets. The example above shows two packets with
 length 752 bytes ( 4 MPEG TS packets) and 1 packet of length 188 bytes (1
 MPEG TS packet).

--
Ticket URL: <https://trac.ffmpeg.org/ticket/2748#comment:10>
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