[mythtv-users] "mythtranscode --mpeg2" and Vertical Purple Lines

Dave Sp davespmyth at gmail.com
Mon Oct 10 10:11:36 UTC 2011

On Fri, Oct 7, 2011 at 6:08 PM, James MacKenzie <mst3000 at newsguy.com> wrote:

> Have you tried playing the file on another device?
> The reason I ask is that I had an issue with vertical purple lines on
> playback of mpeg2 on anything 1280x720 or 1920x1080 at one point.  I had to
> adjust my playback profile and then everything played fine.
> Not sure it is your problem, but thought I'd mention it.  If you aren't
> normally playing things in mpeg2 this might be your issue.
> ------------------------------
> *From:* Dave Sp <davespmyth at gmail.com>
> *Sent:* Fri, 7 Oct 2011 16:47:40 -0400 (EDT)
> *To:* Discussion about mythtv <mythtv-users at mythtv.org>
> *Subject:* [mythtv-users] "mythtranscode --mpeg2" and Vertical Purple
> Lines
>  I use "mythtranscode --mpeg2 --honorcutlist ..." from the command line to
> create a cut version of a recording.
> When I play the result, vertical purple lines show up a couple every 50
> seconds.  Each burst of purple lines lasts 20 frames, give or take a few.
> (If I don't use the "--mpeg2" option, the result has no purple lines, but
> it takes a lot longer to generate the file.)
> Any idea what could be causing this?
> --Dave

The output from "mythtranscode --mpeg ..." has those purple vertical lines
when played in mythvideo, mplayer, and even vlc.

I re-ran "mythtranscode --mpeg ..." with "-v all".  It seems the purple
lines coincide with the debug lines "Inserting 0 I-Frames after #....".

Is inserting "0" I-frames causing the glitches?

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