[MEncoder-users] Loss of MPEG2 index(?) upon re-multiplex?

[Justin Piszcz]

  Problem: Audio is too low in an mpeg2 file.
Solution: Extract video, audio, fix audio, put back together.

For MPEG-2:
1. mencoder input.mpg -of mpeg -nosound -ovc copy -o output.mpg
2. mplayer input.mpg -vo null -vc dummy -ao pcm ; mv audiodump.wav output.wav
3. sox output.wav output2.wav vol +12 dB ; mv output2.wav output.wav
4. mplayer -frames 0 input.mpg 2>&1 | grep ^AUDIO
    -> AUDIO: 44100 Hz, 2 ch, s16le, 224.0 kbit/15.87% (ratio: 28000->176400)
5. lame -m j -q 0 -b 224 output.wav output.mp3
6. mencoder output.mpg -ovc copy -oac copy -audiofile output.mp3 -o finish.mpg

--

When I do this though, it loses the index of the mpeg?
When I scroll using the arrow keys through the normal (input.mpg) it scrolls
normally.

When I scroll using the arrow keys through the finish.mpg (if i hit 
anything that moves forward, it goes DIRECTLY) to the end of the video and 
closes.

Any idea why this is?

Thanks,

Justin.