[mythtv-users] Live TV Playback - Is There a Fix?

[jim]

On 03/01/2015 04:59 PM, Tim Draper wrote:
>>> I agree - I too would help if I could.
>>>
>>> Have you looked at the Frames decoded/free metric to see how the ratio
>>> changes if you pause live TV HD for a few seconds and then continuing
>>> with regular viewing?
>> well, now i've found where you see those figures (playback, menu > playback > playback data), i'll keep an eye on things. recorded HD tv show is currently running 19/2 as a 'it playbacks perfectly' figure to work with.
>>
> quicker than i thought it'd be to check/confirm.
> liveTV: drops back to h.264/ffmpeg from h.264/vaapi codec/dec after switching livetv HD channels.
> Frames decoded/free randomly varies when it first starts livetv. Seen it as low as 5/17 when it jitters. Having it around 19/2 produces smooth playback.
>
> help any?
>
>
Yes. I've seen that low ratio too when entering live tv, for both vaapi 
and ffmpeg, and it is usually problematic. If vaapi is being used, and 
you pause for a few seconds before continuing, the ratio is back to the 
21/2 level and the viewing is smooth. I wonder if this means the live tv 
should be building more of a buffer before starting to play? I really 
don't know - just another data point for the developers.