[mythtv-users] Raspberry Pi 3 frontend not quite getting there

[Peter Bennett]

On 10/20/2016 09:27 AM, mythtv wrote:
> On 10/19/2016 03:08 PM, Peter Bennett wrote:
>> On 10/19/2016 02:17 PM, mythtv wrote:
>>> On 10/15/2016 10:30 AM, Peter Bennett wrote:
>>>> On 10/15/2016 10:22 AM, mythtv wrote:
>>>>> I, too, have trouble reaching the perfect playback, although mine is
>>>>> with hockey.  Same thing, when the camera pans, there's an occasional
>>>>> stutter.  I followed the same instructions and have tried all of the
>>>>> appropriate optimizations from the wiki.  I chalked it up to not quite
>>>>> ready for prime time just yet and will continue to wait.  I'm hoping it
>>>>> can be achieved soon.  I like the IR receiver ability of the pi and the
>>>>> small form factor that I can basically Velcro to the back of a TV.
>>>>> _
>>>> Try the option -v playback on mythfrontend and see if there are any log
>>>> messages at the time of the stutter. If you can supply a sample video
>>>> file I can check it and see if I can do something to improve it.
>>>>
>>>> Peter
>>>>
>>>> _______________________________________________
>>>> mythtv-users mailing list
>>>> mythtv-users at mythtv.org
>>>> http://lists.mythtv.org/mailman/listinfo/mythtv-users
>>>> http://wiki.mythtv.org/Mailing_List_etiquette
>>>> MythTV Forums: https://forum.mythtv.org
>>> Peter, sorry for the direct response.  I didn't want to post a link to
>>> the sample video to the public.  I cut out a few minutes of a hockey
>>> game.  The link is below. The file is about 95MB in size.  I was hoping
>>> it would be smaller.  I hope that's not a problem.  I still get the
>>> errors about the unaligned plane in VLC.  I assume it will playback
>>> poorly on the pi3.  My pi3 is still in use at work so I'm unable to get
>>> the -v playback logs.  Hopefully this will be helpful in
>>> troubleshooting.  I have a feeling I may have to transcode my recordings
>>> to make them playback ok, but I'm surprised they playback ok on my other
>>> Ion boards.  Maybe its the nvidia chipset on my Ions that's doing the
>>> extra compensating?
>>>
>>> Anyway, thanks for any help you can provide.  And thanks for all the
>>> work you've done to get the pi to this point.  I really want to start
>>> using it as a frontend.
>>>
>>> -Mike
>>>
>> Hi Mike
>>
>> I see some jitter in the picture when panning. I assume that is what is
>> bothering you.
>>
>> This is recorded at 720p at 60fps, so maybe from Fox. Does it also
>> happen with 1080i at 30fps?
>>
>> I tried a few things that did not make a difference.  The -v playback
>> gives some messages about frames dropped and frames slowed, but even
>> after a made a parameter change that fixed that, I saw no difference.
>>
>> I will take a deeper look into it.
>>
>> Peter
>>
>>
> Thanks Peter.  Yes, the jitter while panning is what I was referring
> to.  I haven't tried any interlaced video.  My Ions usually didn't like
> that in the past.  I have AT&T Uverse and I have the STBs locked down to
> 720p to remove the interlaced content for me.  I'm surprised that it
> records at 60fps.  I never noticed that before.  That's definitely
> excessive and I'll have to look into getting that back down to 30.  I
> don't know what would be causing that.
>
Many channels use 720p at 60fps, so if you are using a digital tuner
like hd homerun that is what you would get. For example Fox channels use
that. I don't know if the 60fps contributes to the problem you are seeing.