Video play becomes very lag when OSC shows up on OSX

[hkenneth]

I'm using ChrisK's latest build on OSX 10.9.3. I use Nvidia Web Driver instead of the vanilla OSX driver. Video play becomes really lag when OSC shows up. I got the following in Terminal:

[stream] Video (+) --vid=1 (h264)
[stream] Audio (+) --aid=1 --alang=eng () (dts)
[stream] Subs (+) --sid=1 --slang=eng () (subrip)
AO: [coreaudio] 48000Hz stereo 2ch float
AV: 00:00:00 / 00:57:36 (0%) A-V: 0.000
VO: [opengl] 1280x720 => 1280x720 yuv420p
AV: 00:00:05 / 00:57:36 (0%) A-V: 2.789 Late: 51

       *************************************************
       **** Audio/Video desynchronisation detected! ****
       *************************************************

This means either the audio or the video is played too slowly.
Possible reasons, problems, workarounds:

• Your system is simply too slow for this file.
  Transcode it to a lower bitrate file with tools like HandBrake.
• Broken/buggy audio driver.
  Experiment with different values for --autosync, 30 is a good start.
  If you have PulseAudio, try --ao=alsa .
• Slow video output.
  Try a different --vo driver (--vo=help for a list) or try --framedrop!
• Playing a video file with --vo=opengl with higher FPS than the monitor.
  This is due to vsync limiting the framerate.
• Playing from a slow network source.
  Download the file instead.
• Try to find out whether audio/video/subs are causing this by experimenting
  with --no-video, --no-audio, or --no-sub.
• If you swiched audio or video tracks, try seeking to force synchronization.
  If none of this helps you, file a bug report.

[ChrisK2]

very lag, such desync, wow

Anyway, I think we need a bit more info. We recently discovered that very odd characters in the file title (which is displayed at the top of the OSC) may cause lag.

Does this happen with all files or just specific ones? Anything odd in your config?

[hkenneth]

In fact, I found that no text is displayed in OSC. Neither does OSD show any text.

[hkenneth]

To my surprise, after I manually defined OSD font, the issue disappears. I guess it may link to the default OSD font settings?

sub-text-font = 'Myriad Pro'
osd-font = 'Myriad Pro'

Instead I got following error in Terminal:

[osd/libass] Error opening font: '/Library/Fonts/MyriadPro-Regular.otf', 1
[osd/libass] Error opening font: '/Library/Fonts/MyriadPro-Regular.otf', 1

As showed above, same font is used for sub-text, but no error for sub.

[ghost]

Is this with libass-ct or vanilla libass?

[hkenneth]

I don't know which one ChrisK used

[ChrisK2]

libass-ct
For me it just falls back to Arial though.

[ghost]

So I guess libass-ct doesn't handle fallback to font families correctly? (Or whatever generic names like Sans are called in fontconfig terminology.)

[hkenneth]

Well, because I prefer Helvetica to Arial, I disabled Arial on OSX so that websites would use Helvetica instead... So basically no Arial in my system would be found. Could this be the reason for the issue? (I think Helvetica or Lucida Sans should be the default font family on OSX)

[ghost]

Potentially. @pigoz should know.

[pigoz]

Potentially. @pigoz should know.

Yeah it is known. It's one of the merge blockers of the fonts branch. Thanks for ping though.

[ghost]

Duplicate of: libass/libass#186