Tool to determine GOP length

[mocham]

Is there any tool in Linux to analyze the GOP length of a video file?

The only way I know of doing this is to load the video in avidemux and step through frame by frame until I hit the I frame. Thanks for any tips.

[disturbed1]

GOPchop can. It has an info window that displays all the GOP info. It's picky about mpg's though. Doesn't play well with transport streams. Needs libmpeg2 and GTK2.

dvbCut (QT3 + ffmpeg) is another one. dvbcut handles transport streams just fine. Versions prior to 0.6 had an info windows, for some reason these newer ones from svn do not.

[mocham]

gopchop crashes with all the files I tried to load. I use dvbcut for MPEG2 TS already.

[disturbed1]

Try using a clean libmpeg2 and gopchop instead something from a distro package. Distro packagers don't always do the best job ;) Ubuntu has a 1.4MB patch file against gopchop. The entire source is only 2.4MB. Looks like they attempted to rewrite at least half the source code.

When you launch gopchop from a terminal what is the error that's given? And what type of source stream are you feeding it? As I noted above, gopchop does not work correctly with transport streams.

[mocham]

It just seg faults after reading/loading the file. I'm not feeding it MPEG2-TS, I'm feeding it MPEG2-PS from a PVR-250 card. Older packaged versions of it used to work, I'll try compiling from source.