On 16/06/16 03:34, Bernard Giannetti wrote:
> 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.
>
cat and the removed concat avio work exactly the same.
assuming the .mpg are ps files and you want to generate a ts file of the
sum of them you can do:
avconv -i in.mpg -ss 00:12:00 -t 0:03:00 -codec copy out${item}.ts
cat out01.ts out02.ts ... > final.ts
alternatively you can build an hls playlist and use it.
lu
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