[mythtv-users] Lossless cut error - last video segment not included in resulting video file

Robert Kulagowski rkulagow at gmail.com
Thu Nov 1 16:04:42 UTC 2012

I will test and see if it occurs on more than just FXHD.

Do you have any sense in what's happening with the mkvmerge that might
cause it to not include the last segment?

Are the individual segments kept in /tmp ? If they are then I can check
things like media info and see if there's anything different about the last

Also, since this is all MPEG2, then I could potentially just cat all the
individual sub-parts back together to at least get a file that's been cut
and includes the segments... ?

On Thu, Nov 1, 2012 at 7:39 AM, Doug Vaughan <r.d.vaughan at rogers.com> wrote:

> Robert,
>     Thanks for reporting this issue. I noticed that you have an HDHomerun
> recording device, unfortunately you are the second HDHomerun user to report
> that the last cut of their recording was not included in the lossless cut
> mkv file.
> This user provided me with an entire recording to test with. Here is what
> I found:
> 1) The issue seemed to only impact one specific channel's recordings
> (Ithink it was NBC in Grand Falls)
> 2) Lossless Cut did created the last cut segment
> 3) At merge time that last segment along with the proceeding ones were all
> passed to mkvmerge (merging utility) to create the final MKV lossless cut
> file, but it always failed toinclude that last segment.
> 4) This seems to be a bug with MKVToolnix (mkvmerge) as it is consistent
> with the HDHomerun and specific channel's recordingsand now fortwo
> different users.
> Until mkvmergeprovides a fix for this issue there is nothing that can be
> changed in Lossless Cut to fix this issue. I did investigate allowing the
> use of ffmpeg to perform lossless cut and/or merge operations but it came
> with its own set of issues. The worst was random video artifacts at the cut
> points which effected ALL recordings. At this time mkvmerge, even with its
> limitations, seems to be the best utility for the job.
> I notice that you are using Lossless Cut v0.1.4 please update your install
> to v0.1.5 (released late Tues Nov 30th). This will not likely have any
> impact on the problem you have reported but does include a fix for the
> extraction and inclusion of HDHomeruns EIA subtitles. There are a number of
> otherbug fixes and new features in this most recent release.
> I hope you can get some value from Lossless Cut.
> Thanks for trying this script out.
> Doug
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