[mythtv] MPEG2-MPEG2 transcoding: Illegal video stream

[Thomas Börkel]

HI!

I edited 5 recordings (ivtv, PVR-x50) ) and let them transcode from 
MPEG2 to MPEG2.

The resulting files all play OK in MythTV, but other programs report 
illegal video streams for 2 out of 5.

The original (uncut) files are all OK.

When I try to demultiplex/multiplex them (I want to convert the audio
stream from mp2 to ac3), no multiplexer recognizes the video stream.

I tried demultiplexing with mpeg2desc and with tcdemux.

I tried multiplexing with mplex and tcmplex.

It's always the same: The video stream is somehow illegal according to
mplex and tcmplex.

TMPGEnc DVD Author (Windows Software) also reports illegal video stream.

When I load the corrupt 2 files into avidemux and just save them again, 
they are fixed.

Is this a known problem? What can I provide to hunt down the cause? 
Should I open a ticket?

Using Myth 0.19.

Thanks!

Thomas