[FFmpeg-devel] [patch][RFC] mpeg-ts not packetized properly over UDP

[Michael Niedermayer]

On Sun, Aug 15, 2010 at 04:24:59PM +0300, aviad rozenhek wrote:
> when using ffmpeg to mux an mpegts stream over UDP, the data is not
> packetized properly.
> the default packet size of UDP is 1472, which is not an integer multiple of
> 188 (the TS packet size).
> this causes problems if UDP packets are dropped or reordered.
> 
> this can be worked around from the commandline if changing  cmdline from:
> *> ffmpeg -re -i <input_file>  -f mpegts udp://localhost:1234*
> to:
> *> ffmpeg -re -i <input_file>  -f mpegts udp://localhost:1234?pkt_size=188*
> *
> *
> however I think this makes it difficult for user to use properly.
> attached is a simple (but not as efficient as possible) patch that fixes
> this problem, by flushing after writing every TS packet.

the udp packet size should be a multiple of the underlaying streams packet
size when possible and it should be as large as possible
making it 188 is not ok, this has too much overhead

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 190 bytes
Desc: Digital signature
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20100817/3479b377/attachment.pgp>