I want to play from start to finish. I have in my Final Cut Pro the choice of producing a file with the following codecs
Quicktime movie Format Size 1980 X 1080 MPEG4 Format Size 1980 X 1080 H.264 for apple devices Format size 1280 X 720 (.m4v) What codec works best with format size 1920 X1080? One of these or is there another one more suitable. [pix_film] was able to open the .m4v (H.264 for apple devices Format size 1280 X 720) but when the video plays it stutters. What causes this? The codec or [pix_film] or my cpu's capacity? I'm running a mac pro with 2 x 2,8 GHz Quad-Core Intel Xeon and 6GB of RAM. M On Fri, Mar 14, 2014 at 4:51 AM, Charles Goyard <[email protected]> wrote: > Alexandros Drymonitis wrote: > > If you are aiming to JUMP to specific frames in > > > the video or play it backwards you would choose a different codec > > > than if you just want to play it from the beginning to the end > > > linearly. > > > > Could you give some examples? I don't know anything about this but would > > really like to. Could you explain why is it like this? > > This is because with some codecs, to save storage space/bandwidth, > movies are made of a few full images (key frames), and partial images > that hold only the difference with respect to the previous keyframe. Say > there is 1 full frame for 24 partial frame. > > So if you jump to a partial frame, the computer has to seek to a > keyframe and then to the diff frame, and rebuild the complete image from > that. > > mjpeg is just more or less a series of JPEG images in a queue. So when > you seek to frame x, there is less work to do. The downside is that > files are very large. > > If you just read a movie linearly, you're good with keyframes and so. > If you want to jump all over the file like crazy, it could be more > efficient with mjpeg. > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >
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