[MPlayer-users] mencoder to join files: keyframes gone?
johan at ccs.neu.edu
Thu Jan 22 05:39:22 CET 2004
I've sucessfully used mencoder and -copy switches to concatenate several
avi files. The original files all seek very well; without the floating
colored blocks effect. The concatenated file plays perfectly (great
sync), but seeking results in upto a second or two of image degradation
(ie, blotchy blobs) before quality is restored. I'm concluding that the
original had more keyframes than the concatenated version. The
concatenated version is also smaller than the sum of the parts, so this
may well be the case.
Is there someway to request more keyframes (or that all keyframes are
kept?), or am I misdiagnosing the problem?
cat "$1"*avi | mencoder -ovc copy -oac copy -forceidx -o "$1_joined.avi"
As a contrast,
avimerge -i "$1"*avi -o "$1_joined.avi"
seeks fine, but has sync problems more often than not.
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