Thanks for the response, eumagga0x2a.
As a test out, I uninstalled, rebooted, and re-installed, but the problem persists. The folder (C:\Program Files\Avidemux 2.7 - 64 bits) was automatically deleted after uninstall. Are there any other folders I should be deleting?
Here's the clip info from MPC. Is this the info your need, eumagga0x2a?
Video: MPEG2 Video 704x576 (16:9) 25fps [V: mpeg2 main, yuv420p, 704x576]
Audio: MPEG Audio 48000Hz stereo 256kbps [A: English [eng] (mp2, 48000 Hz, stereo, 256 kb/s)]
Subtitle: DVB Subtitles [S: English [eng] (dvbsub)]
Subtitle: UTF-8 [S: No subtitles]
It's recorded on a Humax PVR. I record a lot of stuff this way and 99% of the time they are fine in Avidemux. The filesize is 2,597,392 KB.
Clip plays fine on MPC and VLC.
Any ideas? Thanks.