On 09/24/2010 04:46 PM, Mathieu Bouchard wrote:
On Fri, 24 Sep 2010, Matteo Sisti Sette wrote:
By the way I would also like to know the answer to the same question in Mac. As far as I have seen, though, video with GEM seems to perform always much worst in Mac than in Windows and Linux with any codec (except h264 that has a big issue in linux only) - Mathieu said he probably knew the cause of this which was not related to codecs.
What did I say ? I thought I said that if your video uses a codec which requires more CPU than the computer with provide to the codec,
No, not that one (also interesting), I was talking about this one (which as far as I understand is unrelated):
does it also happen when not reading and writing video ? [...] Is that kind of thing slower on OSX than on Windows and/or Linux ? I ask because I wonder whether it can be linked with a problem I know about on OSX...
[...]
What I know is that large memory allocation (128k and more) using the malloc() command, uses in turn the mmap() command, in a way that is much, much slower on OSX than on Linux.
[...]
that's one thing for which OSX is much slower than I expected, and it took me a long time to find out.