[PD] HD 1920 X 1080
Mateo De Los Ríos
mdlrmailinglists at gmail.com
Fri Mar 14 14:58:40 CET 2014
I want to play from start to finish.
I have in my Final Cut Pro the choice of producing a file with the
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.
On Fri, Mar 14, 2014 at 4:51 AM, Charles Goyard <cg at fsck.fr> 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
> 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.
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