[mythtv-users] IPTV Recording: No Sound. Audio codec problem?

Nate Crosno ncrosno at ipass.com
Tue Jan 9 19:38:04 UTC 2007


 
Hi All, I'm reposting a previous question to the list but breaking out
the more pressing question at the moment, adding more info, and changing
the subject line...

I have been able to view and save the IPTV streams on the Myth box that
are going to my little Amino STB by splitting the cable with hub.  I can
save the stream with a command like this:

vlc udp:@225.1.1.38:2001 --ts-dump-file test.mpg

Or I can view the stream with either of these commands:

vlc udp:@225.1.1.38:2001
xine udp://225.1.1.38:2001

...however I do not get any sound.  I copied the test file to a windows
box and did get sound when watching VLC.  I have tried to compare the
file with known good files saved off my HD DVB card and cannot tell the
difference -- both have A/52 set as the audio codec and MPEGTS for
video.


Using "midentify", I get the following when comparing the saved IPTV
file to a known good HD file:


Ati HD Wonder File		IPTV File
ID_DEMUXER=mpegts			ID_DEMUXER=mpegts
ID_VIDEO_FORMAT=0x10000002	ID_VIDEO_FORMAT=0x10000002
ID_VIDEO_BITRATE=80000000	ID_VIDEO_BITRATE=15000000
ID_VIDEO_WIDTH=1280		ID_VIDEO_WIDTH=544
ID_VIDEO_HEIGHT=720		ID_VIDEO_HEIGHT=480
ID_VIDEO_FPS=59.940		ID_VIDEO_FPS=29.970
ID_VIDEO_ASPECT=0.0000		ID_VIDEO_ASPECT=0.0000
ID_AUDIO_CODEC=a52		ID_AUDIO_CODEC=a52
ID_AUDIO_FORMAT=8192		ID_AUDIO_FORMAT=8192
ID_AUDIO_BITRATE=384000		ID_AUDIO_BITRATE=192000
ID_AUDIO_RATE=48000		ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2			ID_AUDIO_NCH=2
ID_LENGTH=7.26			ID_LENGTH=2.30
ID_VIDEO_CODEC=mpegpes		ID_VIDEO_CODEC=mpegpes


Any ideas on how to get the audio working would be greatly appreciated.
Also, I tried to play the IPTV file in myth via "mythtv test.mpg", but
that bombed out. I can provide logs if anyone is interested.

Once I get the sound playing at all, I'll worry about step 2, which is
getting Myth to record and play the files.

Thanks,
-Nate



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