[mythtv-users] Playback problem -- random short pauses

Steven Adeff adeffs.mythtv at gmail.com
Mon May 30 18:13:41 UTC 2011


On Mon, May 30, 2011 at 4:42 AM, Andre <mythtv-list at dinkum.org.uk> wrote:
>
> On 24 May 2011, at 08:19, Andre wrote:
>
>>
>> On 23 May 2011, at 17:42, Michael T. Dean wrote:
>>
>>> If you want to prevent all the "random short pauses" that occur during
>>> playback, simply change your Playback Profile group such that you never
>>> use VDPAU decoding.  Use ffmpeg decode with VDPAU rendering, and all
>>> works well.
>>
>> Tried this a while ago, even with a C2DQuad at 2.4Ghz software h264 playback is marginal, occasional big pauses, different but no less annoying!
>>
>> Also how do you get reasonable quality de-interlacing without using vdpau? The software de-interlacers are all terrible!
>>
>> I tried with a work i7 2.8Ghz machine and software playback was ok but still can only get good picture quality when using vdpau rendering and de-interlacing at which point micro pauses re-appear.
>>
>> I'll have some time next week (if the Icelandic volcanoes will allow me to get home) to re-do these tests with 0.24.1 also with a local install rather than my nfs boot and report back.
>
> Replying to self to keep this all in context:
>
> GT430 was running very hot, added 80mm fan, now running cool to touch. This made no improvement, in fact playback has been much worse since, odd!
>
> Removed vdpauhqscaling from options, no discernible change. Now using vdpaustudio,vdpaubuffers=32,vdpaucolorspace=auto
>
> Alsa buffers set to 3072, on all installs.
>
> I built a replacement frontend with a small laptop HDD in the same hardware C2D 1.8Ghz GT430 and tested that.
>
> Mythbuntu 10.10 64 bit, Alsa 1.0.24, JYA 0.24 latest myth-frontend, nvidia 256, 260 or current 270 was never able to get playback for more than a few seconds before breakup & hard crash.
>
> Reverted to Mythbuntu 10.04 32bit (same as NFS boot I had before) Alsa 1.0.24, JYA 0.24 myth-frontend Nvidia-current 270, exact versions as NFS boot.
>
> This ran for a 1hour H264 HD show with no glitches, second 1 hour show was glitchy (10 to 12 glitches) but not as bad as originally with NFS boot, rewind and play again has no glitch so playback glitches not recording. GT430 still cooled with noisy adjacent fan.
>
> Also tried latest (post hack) PS3 firmware and still crashes on h264 HD playback and won't play BBC HD streams at all, so no respite there until 0.24 glitches get fixed.
>
> Will try software playback and vdpau de-interlacing next.
>
>>
>> Andre
>>
>>
>>> The only pauses you'll see is the at-recording-start/stop
>>> pauses (which is a completely separate and unrelated problem).
>>>
>>> Oh, also, I'm not using VDPAU deinterlacing, but I haven't tried whether
>>> use of VDPAU deinterlace causes the problems even when using ffmpeg
>>> decode (but if so, that would be very valuable information for helping
>>> track down the root cause).
>>>
>>> Mike

folks,  make sure to read Michael T Dean's email from May 23rd.


-- 
Steve
http://www.mythtv.org/wiki/User:Steveadeff
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