David Abrahams wrote:
I notice that the performance of playback seems to be suboptimal. For
example, I captured some HDTV video over firewire using MythTV. When
I try to play it back using the frontend, it is totally unwatchable.
The action occurs at about half speed because of stuttering and
includes frequent pauses of up to a second. I tried tweaking all the
obvious settings in the Playback section of the front end's setup
screen, to no avail.
However, when I use VLC to play the same file, it looks almost
perfect, with only barely perceptible jerkiness due, presumably, to
the fact that my Mac Mini can't quite keep up with playback. I
grepped the MythTV source for CONFIG_DARWIN to find the
Darwin-specific playback code, but came up empty. Perhaps we *need*
some darwin-specific playback code? And if Darwin-specific playback
code turns out to help, doesn't it indicate that the playback code
MythTV is using for all other platforms today could be a whole lot
more efficient?
I believe so. Similar to Linux, software playback is the norm unless
other things are used to get hardware acceleration working. On Linux we
can use XvMC on some cards to get things to render accelerated in
hardware. I would expect that similar features would have to be taken
advantage of (which VLC probably already does) to enable the
acceleration on the Mac side.
Kevin
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