[mythtv-users] Problems with transcoded HD playback

Jason Weida jason.m.weida at gmail.com
Sun Jun 22 13:27:52 UTC 2008

OK, I found that I had somehow managed to leave the "resize video" option
unset in the transcoding profile I was using.  I'm now able to transcode all

I'll keep an eye out for this issue as I ramp up my use of Myth.

On Fri, Jun 20, 2008 at 4:05 PM, Jason Weida <jason.m.weida at gmail.com>

> Hi Paul,
> I'm trying to set up my system to transcode all my recordings for the same
> reason (slow frontend).
> Sorry I don't have any input on your particular issue, but I was hoping you
> might give me a tip.  What video size are you using?  I just tried to
> transcode a recording (manually from the "watch recordings" screen), and it
> chugged away for a while, but didn't seem to do anything.  The video was
> still in HD.  I'm thinking that after the transcode, the resultant video did
> not show up in the "watch recordings" screen.  How can you get to transcoded
> recordings, is there something special you have to do to get them added to
> the list?
> I welcome your input and will gladly help you if I can somehow once I get
> up and running.  I also use the HDHomerun, so it sounds like we have a
> fairly similar setup.
> Jason
> On Fri, Jun 20, 2008 at 1:55 PM, Paul V. Gratz <pgratz at gratz1.com> wrote:
>> Hi all,
>> Recently I've noticed two occasions where I've transcoded a recording
>> from my HDHomerun and the resultant file has very choppy playback.  I
>> have my backend setup to transcode all HD recordings because only one
>> of my frontend's has the horsepower to play the HD streams as they
>> are.  Typically this seems to work but twice now I've noticed that the
>> resultant file's playback is very choppy.  In both cases I did not
>> view the pre-transcoded file so I can't say if it had the same problem
>> or if the transcoding caused it.  The choppiness is also very odd,
>> when I first start the show, the video seems to be slowed down and out
>> of sync relative the audio.  Then after ~10-15 seconds the audio gets
>> very choppy.  If I stop, fast-forward, or rewind the audio choppiness
>> goes away for about 15 seconds before starting up again.  If I try a
>> different recording it works fine so it must be something about that
>> particular recording.
>> I am recording OTA HD but I don't think this is a transmission quality
>> issue, this station is very strong and the picture looks perfect.  I
>> also don't think this is a frontend horsepower issue because I have
>> experienced it on my P4 3.2GHz front end (that non-transcoded HD plays
>> fine on).   Here are some stats:
>> Gentoo Linux (updated recently)
>> mythtv v0.21_p17100
>> Linux v2.6.16-gentoo-r7
>> I'll try updating to a more recent fixes patch this weekend, does
>> anyone know of an other possible cause?
>> Thanks!
>> Paul
>> --
>> -----------------------------------------
>> Paul Gratz
>> Electrical and Computer Engineering
>> The University of Texas at Austin
>> http://gratz1.com/pgratz/
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>> mythtv-users at mythtv.org
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