[vlc] How to fix choppiness in H264 playback

[Richard Cavell]

Hi, all.

I use the latest version of VLC on OS X 10.8, on a MacBookPro8,1 (i7 version) with 8 gig RAM. I regularly play movies, each of which is about 1 gig of h264 at 720x576x25. Sometimes I get my computer to do disk-intensive work (video editing using Adobe CS) in the background while I watch my movies. But when the video editing hits a part that's filled with compositions/edits, the movie becomes choppy. If I pause and then unpause the movie it gives VLC a chance to catch up, but it sometimes becomes choppy again within a few seconds. I wish that, while I pause the movie, VLC would cache further ahead.

If the bottleneck is disk I/O, is there some way that I can tell VLC to cache more of the movie in RAM to avoid disk I/O on the fly? If the bottleneck is CPU decoding, can I somehow cache that, or tell it to degrade more gracefully than it does?

Richard
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[dE .]

Post by Richard Cavell
Hi, all.
I use the latest version of VLC on OS X 10.8, on a MacBookPro8,1 (i7
version) with 8 gig RAM. I regularly play movies, each of which is
about 1 gig of h264 at 720x576x25. Sometimes I get my computer to do
disk-intensive work (video editing using Adobe CS) in the background
while I watch my movies. But when the video editing hits a part
that's filled with compositions/edits, the movie becomes choppy. If I
pause and then unpause the movie it gives VLC a chance to catch up,
but it sometimes becomes choppy again within a few seconds. I wish
that, while I pause the movie, VLC would cache further ahead.
If the bottleneck is disk I/O, is there some way that I can tell VLC
to cache more of the movie in RAM to avoid disk I/O on the fly? If
the bottleneck is CPU decoding, can I somehow cache that, or tell it
to degrade more gracefully than it does?
Richard
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There must be an ionice command on your system, on Linux (Unix) there is
one. You can use it to set i/o priority of various programs.
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