[linux-dvb] ts2es, ts dumper

["Franck Arnaud" <franck@nenie.org>]

I had a problem with radio channels (or TV sound used that way),
with the usual:

dumprtp | ts2es | mpg123 -

Streaming from dvbstream this was not really usable: the sound 
has an acute 'blip' every half second or so. rtptsaudio has 
a similar problem, with lots of white noise instead of blips.
Problem is too regular to be in the data, and indeed using 
an intermediary file was much better.

To debug that I wrote some pedantic TS/PES/ES parser, with 
an option to do the same as ts2es. It works, but I don't 
really know why. I had various ideas about the stream 
processing, but none very convincing. Couldn't find anything 
obvious trying to look at rtptsaudio code and the included 
mpegtools code. My current supposition is that it's a buffering
pipe issues and mine works because it does write (stdout, ) on 
PES boundaries, which ts2es may not do. It is probably triggered 
by some combinations of circumstances here (my sound 'card' is 
USB, so maybe there's an issue there). Anyway, if someone has 
a similar problem you may want to give it a try, the program 
is at:

http://www.nenie.org/misc/mpsys/

It also includes a dumper for all of the TS/PES/ES(audio) 
headers, with continuity checking, so it may also be useful 
to check that a stream is well formed or see all the 
info in the packet headers. The packet parser can be used as a 
library.

--
franck@nenie.org



-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.