#98 1st Video Stream Header Corrupted

[modesto98]

I am using MPGTX to split a MPEG file I recordedfrom a AverMedia card on a Linux system.

The command is
mpgtx -2 junk.mpg -b junkout

I am using 1.3.1 complied on puppy linux 2.17

two problems:
1) MPGTX does not recognise the system header. I can get round that by using -P or I can fix it by chnaging b8 (audio stream ID)to C0 ( all audio streams)
I do not care about this, but if there is a simple patch I can apply to the file for my header it would be nice.
2) MPGTX seems to drop the first two bytes (bytes 4 and 5 including 00 00 01 e0) of the video stream header 07 d4 ( 00 00 01 e0 07 d4 .... becomes 00 00 01 e0 ...). It only does this in the first instance of the header. I can fix it by overwriting the prior bytes to make bf e0 02 00 00 01 e0 07 d4 into bf 00 00 01 e0 01 e0 07 d4 . I know that does not make much sense I am shooting in the dark. Likewise I can fix it by playing with pack lenght in mpeg.cxx and recompiling. I can probably patch the code myself for my purposes ( ie this odd ball header) but I cannot see how you split off the system header and then video stream header. I assume the problem is that the system header is too long or misinterpreted.

See the file attached for details, you cand see that the two bytes bytes 4 and 5 PES packet length are getting dropped. It stil plays but has artifacts in the first few frames, and it is possible to fix.

Any hints anyone?

[modesto98]

Binary view of beginning of MPEG file