[mythtv-users] SRT subtitle rendering causes stuttering

[Jim Stichnoth]

On Wed, Aug 21, 2013 at 1:15 AM, Marius Schrecker <marius.schrecker at lyse.net
> wrote:

> Hi again,
>
>   As I mentioned in another thread I have just upgraded my tv from a 720p
> to a 1080p modell. One of the main improvements is in smooth playback as I
> can now properly match frame- and refreshrates. Watched a 1080 at 24p film
> yesterday and playback was supersmooth...UNTIL I loaded and started to
> render .srt subtitles. Every time a new line of text was rendered, the
> video would freeze for a moment. It seemed like the effect was worse, the
> more text was displayed.
>
> System is dual core opteron @3.4GHz, 6GB ram, Nvidia GeForce GT 210
> /vdpau. MythTV 0.26 FE/BE
>
> This looks a bit similar to this<http://www.mythtvtalk.com/subtitles-cause-stuttering-video-audio-buffer-underruns-mythfrontend-0-24-a-14113/>thread, as I did mess about with the subtitle settings so I could see them
> on my older/smaller TV. I could check zoom settings, and live with smaller
> text now, but my CPU should be able to handle it as it is. The question tha
> t springs to mind is whether this might have something to do with frequency
> governors, and whether a more aggressive governor might help.
>
> Has anyone experienced similar and been able to solve it?
>

What theme are you using, and what does its osd_subtitle.xml look like?
 There are certain effects that can be expensive to render, such as
outlinesize, and if it takes too long to render the subtitle (or any other
OSD component), you can get a dropped frame.

Jim
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