Demuxing/Muxing

[lemmy999]

I know what muxing and demuxing means, but unless you want to edit the audio seperately, or demux an MPEG with TMPGEnc and remux with bbMPEG to get the scan entry points so you can have chapters, why would you want to demux/mux? It seems everyone is doing it but me. It just seems to be an extra step and an extra tool to use (and there already seems to be too many: AVI_IO -> Vdub -> TMPGEnc -> VCDImager -> Nero) when I am trying to capture 1 hour and encode every day. Thanks,

[homerpez]

I think a lot of people demux/remux a TMPGEnc-encoded movie only because of a slight "out-of-sych" effect that can happen when you FF/RW a VCD (partiularly an off-spec one).

I have just tried one now, I have not yet tried playing it in my standalone, but I've already made a couple of observations.

#1 - The total file size ends up around 10MB bigger than when TMPGEnc does it alone. This means bbMPEG does something.

#2 - When I play it in PowerDVD (nothing else, since not too many programs handly VBR very well), I notice that when you skip around the movie, it will snap back into motion twice as fast as the TMPGEnc product.

What I mean is when you skip around randomly (like if you did a time search on your DVD player), it skips to a frame and hangs for a second, until it finds a video frame to "latch on" to, then it starts playing. I noticed that on PowerDVD anyway, this "snapping" happened more quickly, and it was probably more accurate.

I'll test this later on my standalone and see if it really makes a difference.

[Darkbird]

1 - Some DVD authoring software only accepts elemental streams (i.e. demuxed files).

2 - Demuxing allows processing the video and audio with different programs.

3 - There are a few utilities for changing frame rates and removing the pulldown (telecine) flags for NTSC video that can only be used with a demuxed video file.

4 - As the other person pointed out, some programs mux better than others with certain material. (i.e. make files that are more compatible.

<font size=-1>[ This Message was edited by: Darkbird on 2001-08-03 06:54:20 ]</font>

Hello guys,

try the new demux/mux program
http://www.moonlight.co.il/products/Xmux.html