Hi,
I have been using avconv to cut up and then stitch together audio/video files
which originally came from a MythTV recording. In short I note the times when
a commercial break is on and then repeatedly get avconv to split at those times
and then finally stitch all back together.
Typically a cut is done by this:
avconv -i in.mpg -ss 00:12:00 -t 0:03:00 -codec copy -f mpegts out.mpg
I was using the concat option to do the stitching, but now it has been disabled.
After chatting with someone (elenril) on an IRC channel a while back, I was
told why the option was disabled and then suggested that I instead cat the
files to avconv and use pipe:0...for example:
cat 0.mpg 1.mpg 2.mpg 3.mpg 4.mpg 5.mpg 6.mpg 7.mpg 8.mpg 9.mpg 10.mpg
11.mpg 12.mpg | avconv -v verbose -y -i pipe:0 -f mpegts -c copy out.mpg
which then produced a short file and this error:
[mpegts @ 0x822900] Application provided invalid, non monotonically
increasing dts to muxer in stream 1: 424716480 >=
424716480av_interleaved_write_frame(): Invalid argument
I was told on IRC that it could be the timestamps within the cut files that are
causing the issue. I ensure that the timestamps I've used to create each cut
file are increasing (in terms of passing them to avconv to do the cutting and
there is no overlap of times). Also I was told that streamcopy + concat will
not work well in general.
So does anyone have an idea please on how I can either reinstate the concat
option, or an alternative way to cut and put back together?
BTW: Yes, MythTV has a cutlist function which I've tried using (with more
anguish than success); however I have to use the MythTV interface and I'd
rather do all this via scripts as I have a large number of files that I
typically slice and dice.
Thanks in advance,
Bernmeister.
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