[mythtv-users] GOPchop and split_mpeg

Chris Birkinshaw chris at postbox.org.uk
Wed Mar 9 21:39:55 UTC 2005

Quoting Cory Papenfuss <papenfuss at juneau.me.vt.edu>:

> Is it possible you have a Transport Stream (TS) rather than a 
> Program Stream (PS)?  I don't know anything about DVB captures, but I know 
> a lot of MPEG utils won't deal with TS's.  Maybe 'replex' or 'dvb-mplex' 
> will demux it to a PS if that's the case.  You may even be able to remove 
> some streams you don't want from the capture to reduce the size.

I tried mpgtx but it wouldn't handle the file at all:

# mpgtx -X -i 1000_20050303060000_20050303091500.nuv
mmm, this file does not start with a pack, offset: 0
use the desperate_mode switch as the first option -X to search for a header in
the whole file!
if you want to force the operation. May yield to an endless loop if no valid
header is found!
warning: couldn't find any valid system header. I'm continuing anyway
1000_20050303060000_20050303091500.nuv can not be handled by this program

I then had a look with tcprobe which reported the following:

# tcprobe -i 1000_20050303060000_20050303091500.nuv
[tcprobe] MPEG packetized elementary stream (PES)
[tcprobe] summary for 1000_20050303060000_20050303091500.nuv, (*) = not default,
0 = not detected
import frame size: -g 720x576 [720x576]
     aspect ratio: 16:9 (*)
       frame rate: -f 25.000 [25.000] frc=3
                   PTS=4663.1543, frame_time=40 ms, bitrate=4350 kbps
      audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x50 [0x2000] (*)
                   PTS=4662.6371, bitrate=256 kbps
                   -D 12 --av_fine_ms 37 (frames & ms) [0] [0]

This indicates that the stream is not a TS. Has anyone got any idea why I can't
split it? 


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