This is just a short reminder for me and a note for you: this one-liner might be helpful if you need to write a little script for splitting a long MPG file in shorter parts without quality loss (this example cuts from 40th minute to 1 hour).
ffmpeg -sameq -ab 256k -vcodec copy -acodec ac3 -ss 00:40:00 -t 01:00:00 -i M2U00014.MPG t2.mpg
This is the output of ffmpeg using a MPG file taken from my camera (low resolution mode).
Input #0, mpeg, from 'M2U00014.MPG':
Duration: 00:04:30.68, start: 0.111722, bitrate: 3058 kb/s
Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR 16:9], 9100 kb/s, 25 tbr, 90k tbn, 50 tbc
Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
Output #0, mpeg, to 't2.mpg':
Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR 16:9], q=2-31, 9100 kb/s, 90k tbn, 25 tbc
Stream #0.1: Audio: mp2, 48000 Hz, stereo, s16, 256 kb/s
