[mythtv-users] Video Editing HELP! (COMPLETE noobie)

Nick Rout nick.rout at gmail.com
Tue Jun 2 22:17:19 UTC 2009

On Wed, Jun 3, 2009 at 9:27 AM, Douglas Wagner <douglasw0 at gmail.com> wrote:
> On Tue, Jun 2, 2009 at 11:34 AM, Johnny <jarpublic at gmail.com> wrote:
>> > For the MythTranscode line above -c and -s are taking a chanid and a
>> > starttime are they not?  This video is outside of MythTV, there is no
>> > database information for it, thus there is no starttime or chanid
>> > associated
>> > with the recording.  It was originally recorded through Myth but was
>> > transcoded and exported (without removing commercials) a long time ago.
>> > The
>> > original video works (sound/video) but, obviously, there's still
>> > commercials
>> > in it that I'd like to get rid of.  Thus the external editor.
>> The mythtranscode command is to rebuild the seek table. Mythtv uses a
>> seek table to accurately skip forward and back. The seek problems your
>> described are most like caused by the seek table being messed up or
>> not rebuilt when you transcoded to remove the commercials. This
>> command will rebuild the seek table and should allow you to
>> fast-forward and rewind correctly. As far as the old transcoded videos
>> with commercials that you are editing outside of mythtv, that is a
>> separate set of issues.
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> Yea, unfortunately it's that "separate set of issues" that are causing me
> problems.  The recordings inside myth I am at least minimally comfortable
> with, the problems I run into there is after following the transcode steps
> they tend to get corrupted (the seek table gets destroyed)...but I haven't
> tried with the transcode line noted above so that might work.
> What I'm MUCH more worried about right now is to find a generic, easy to use
> tool I can use to correct problems with a video after it's been transcoded
> and brought "outside" of mythtv, such as the videos I have with commercials
> in them, without a seek table, that no longer have mythtv database data for
> them.  Again, I am able to cut commercials but it seems to ruin the video
> (loss of sound, speeding up or slowing down of the video, etc.).
> As to the seek table issue with these videos I read something about in
> essence creating a recording, copying the video over the top of the
> recording (so there's database information on channel and starttime) and
> then using the transcoder to fix the seek table.  I'm not beyond trying
> that, but I suspect that doing this would still not allow me to create cut
> points in Myth video editing to do the process inside myth...maybe it would.
> Perhaps I'm asking the wrong question.  Perhaps the question I should be
> asking is: Is there any way to bring these external videos back into myth's
> database so that they would be again editable through the Myth System?
> Myth's tools seem to work, external tools don't.

According to this thread:


you can produce a seektable for material in mythvideo via:

mythcommflag --video

hope that helps :)

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