[mythtv-users] Transcoded recordings playback fails: audio failure, video stutters (was Last MythTV Gentoo ebuild... buffer issues)

[jk90090]

On 12/9/11 12:41 PM, jk90090 wrote:
> On 12/8/11 9:57 PM, Raymond Wagner wrote:
>> On 12/8/2011 23:11, jk90090 wrote:
>>> I've narrowed down my playback issues now to Transcoded recordings.  
>>> Any
>>> recording that isn't transcoded is playing back perfectly (720p, 1080i
>>> both smooth as silk), and it's pretty much for all transcoded content,
>>> so simply newly transcoded recordings.  Anyone have any ideas?
>> How are you transcoding these?
>> ________________________________
> Ticking the 'transcode' option for the recording schedule, either with 
> Medium Quality or Low Quality
>
> The settings I use are:  (Advanced -> TV Settings -> Recording 
> Profiles -> Transcoders -> ..)
>     Media Quality - Resize video while transcoding, 1280x720, MPEG4, 
> 2200 Bitrate, Max Qual 2, Min Qual 15, Max qual diff between frames 3, 
> Scale bitrate for frame size, Enable High-quality encoding, Enable 4MV 
> encoding; MP3 audio, 32000 sampling rate, qual 7, volume 90%
>     Low Quality - Resize video while transcoding, 960x540, MPEG4, 2200 
> Bitrate, Max Qual 2, Min Qual 15, Max qual diff between frames 3, 
> Scale bitrate for frame size, Enable High-quality encoding, Enable 4MV 
> encoding; MP3 audio, 32000 sampling rate, qual 5, volume 90%
>
> As a side likely unrelated note, in the past I usually used High 
> Quality (RTjpeg, qual 170; MP3 audio, qual 7), and it worked for years 
> until an update in the past 6 months completely broke it, and 
> required, oddly, for me to go back into the settings and just hit next 
> and finish (effectively re-saving the setting for HQ).  It still never 
> worked like it had in the past however, and I had started using Medium 
> and Low Qual Transcode more often anyways so I didn't look into it 
> further.
>
> No difference in playback between the Medium and Low Qual transcoded 
> recordings, still stuttering video with audio cutout generally, 720p 
> or 1080i.  Eventually (seconds) the playback gives up and exits. It 
> looks like I had one recent recording that was transcoded with High 
> Quality, and it is playing back fine.
>
> I am using a Frontend with VPDAU high quality playback (and I have 
> tried without using VPDAU with no different results), and CPU usage 
> for the system is single digits generally when doing playback.  Dual 
> Core i5 I think, 6 GB memory.
>
>
So I never could figure out how to rollback to the earlier build, and 
frankly it would probably be more of a pain than to just have someone 
figure out what is now broken in Myth.  I went ahead and built the 
latest ebuild from github ( using scripts/mythtv-buildebuild.py ):

[ebuild   R   ~] media-tv/mythtv-0.25_pre20111217  USE="alsa autostart 
dvb dvd ieee1394 lame lcd lirc vdpau x264 xvid (-altivec) -bluray 
-crystalhd -debug -jack -perl -pulseaudio -python -vaapi" 
INPUT_DEVICES="-joystick" VIDEO_CARDS="nvidia" 0 kB [1]

No change to my woes.  Next I tried using mythcommflag to rebuild the 
seek tables, just to rule it out.  No change.
I have yet to find a single transcoded recording that plays back anymore.

I switched audio to NULL and no change, so I can't quite see it as a AV 
sync issue.  Ideas anyone?  This is driving me crazy.

-J