[mythtv-users] Disabling Audio, params(0, 0, 0) on transcoded DVB videos.

Greg Grotsky spikeygg at gmail.com
Wed Jul 19 05:12:44 UTC 2006


After using mythtranscode to transcode recordings (DVB from HD-3000), using
mpeg2-mpeg2 the audio drops out.  The myth playback function and mytharchive
both fail to see the audio stream.  However, it is there.  I can play the
recorded/transcoded file with mplayer and the audio works.  I noticed that
when I watch the video the frontend log file says "Disabling Audio,
params(0,0,0)" so I tried hitting the '+' key to switch audio streams and
voila!  I get audio.

  So I think it's either a problem with mythtranscode or a problem with the
mythtv recording player or both.  I have attached a log of "mythfrontend -v
audio" below after starting a transcoded recording for a few seconds then
hitting '+'.  Is /usr/local/bin/mythtv the player that launches when
selecting a recording to watch?  I tried executing it from a command line
and pointing it to the video in question and it played the video and the
audio worked automatically... weird.

-Greg

I'm using SVN 10529.  With the following config:

./configure --enable-proc-opt --disable-firewire --disable-freebox
--disable-dbox2 --disable-hdhomerun --disable-crciprec --disable-ivtv
--disable-dts --enable-dvb --dvb-path=/usr/include --enable-xvmc
--enable-opengl-vsync

log below...
2006-07-18 22:35:27.823 TV: Changing from None to WatchingPreRecorded
2006-07-18 22:35:27.824 Using realtime priority.
2006-07-18 22:35:27.975 Video timing method: SGI OpenGL
2006-07-18 22:35:28.297 AFD: Warning, video codec 0xdd0050 id(MPEG2VIDEO)
type (Video) already open.
2006-07-18 22:35:28.299 AFD: Opened codec 0xe317d0, id(AC3) type(Audio)
2006-07-18 22:35:28.299 AFD: Audio Track #1 is A/V stream #1 and has 0
channels in the Unknown language(0).
[mpeg2video @ 0x2aeedddc2af0]warning: first frame is no keyframe
2006-07-18 22:35:28.312 NVP: prebuffering pause
2006-07-18 22:35:28.315 AFD: Selected track 1: Unknown AC3 ?ch (A/V Stream
#1)
2006-07-18 22:35:28.315 AFD: Initializing audio parms from audio track #1
2006-07-18 22:35:28.315 AFD: Audio format changed
                        from id(NONE)    -1Hz -1ch   0bps    ; id(NONE)
-1Hz -1ch   0bps
                        to   id( AC3)     0Hz  0ch   0bps    ; id( AC3)
0Hz  0ch   0bps
2006-07-18 22:35:28.315 NVP: Disabling Audio, params(0,0,0)
2006-07-18 22:35:37.268 AFD: Initializing audio parms from audio track #1
2006-07-18 22:35:37.268 AFD: Audio format changed
                        from id( AC3)     0Hz  0ch   0bps    ; id( AC3)
0Hz  0ch   0bps
                        to   id( AC3) 48000Hz  2ch  16bps    ; id( AC3)
48000Hz  2ch  16bps
2006-07-18 22:35:37.273 Killing AudioOutputDSP
2006-07-18 22:35:37.273 Opening OSS audio device '/dev/dsp'.
2006-07-18 22:35:37.289 Audio fragment size: 4096
2006-07-18 22:35:37.290 Audio Stretch Factor: 1
2006-07-18 22:35:37.290 Ending reconfigure
2006-07-18 22:35:37.290 NVP: Enabling Audio
2006-07-18 22:35:37.290 AFD: Audio stream type changed.
2006-07-18 22:35:37.291 kickoffOutputAudioLoop: pid 2006-07-18 22:35:37.291 OutputAudioLoop: Play Event
2006-07-18 22:35:37.291 Broadcasting free space avail
2006-07-18 22:35:37.300 Broadcasting free space avail
2006-07-18 22:35:37.303 Broadcasting free space avail
2006-07-18 22:35:37.306 Broadcasting free space avail
2006-07-18 22:35:37.309 Broadcasting free space avail
2006-07-18 22:35:37.317 _AddSamples bytesa44, used=1, freev7999,
timecode116
after this it proceeded to dump out tons of audio info... not valuable in
this instance.
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