HELP: mpeg2 to divx conversion woes ..... :S

[kevingpo]

Ok. I have used AutoGK 1.95 (DivX 5 option) & AutoGK 2.26 (Xvid option) to convert 2 "Hauppauge DEC2000-T" mpeg2 recordings joined into one divx file. Total size of the 2 mpeg2 files = 500MB. Result size = 175MB. All settings on default (auto audio, etc). Video is fine, until it gets to the joined part, where afterwards the video is lagged by 2 seconds. Not so good.

I then used doeasier.org EasyVideoJoiner to join the 2 mpeg2 files. I verified that the joined video is ok and it was. I then used Dr. DivX 1.06 to convert the joined mpeg2 video into DivX 5 (default settings, 175MB result size). Whole video sound is lagged by 2 seconds.

What am I doing wrong? Is there some corruption going on with the 2 mpeg2 files being joined? Do I need to use VirtualDubbMod to re-calculate/re-save the joined mpeg2 file?

[guns1inger]

Have you tried converting the mpeg files eperately, then using virtualdub to join the Divx output ? You will more luck this way than trying to use mpeg2 in virtualdub. Virtualdubmod and virtualdub-mpeg2 can both load mpeg files, but there are restrictions on how you can work with them.

[kevingpo]

Have you tried converting the mpeg files eperately, then using virtualdub to join the Divx output ? You will more luck this way than trying to use mpeg2 in virtualdub. Virtualdubmod and virtualdub-mpeg2 can both load mpeg files, but there are restrictions on how you can work with them.

I will try doing that. Probably the files will be okay. Maybe EasyVideoJoiner can join them together.

However when I tried to AutoGK a 2GB mpeg2 file into 700MB divx, the whole video sound was lagged by 3 seconds.

[Baldrick]

it may help if you repair/demux the dvb recording with projectx (click on it for a guide) and then convert.

[kevingpo]

it may help if you repair/demux the dvb recording with projectx (click on it for a guide) and then convert.

Do you mean demux the dvb/mpeg2 recording for each separate part, or when they are joined together?

Once demux, what do I convert to?

[kevingpo]

Ok, I've tried DivXing the 2 separate files separately in a queue/batch job. Both are fine. Then I used EasyVideoJoiner. No fun. Same results. Something is definitely going wrong with the joining. Probably something to do with keyframes? I'll probably have to use VirtualDubMod to join them manually. Sigh.

[kevingpo]

All this time I been thinking/wondering why AutoGK, Dr. DivX wouldn't work. Then I found this by google:

http://www.hauppauge.co.uk/board/showthread.php?t=2284

Looks like the dec2000-recording is tight/strict and makes invalid mpeg2 files? I have to gop-fix/resize my dec2000-recordings. Why? What is gop and why I have to de-gop my recordings before I can divx encode?

Wish Dr. Divx or AutoGK did this automatically. Anyway, was wondering which best programs can degop good? I heard ProjectX can, however when I tried using ProjectX I didn't know what to do, so hard. Any advice or tips?

[oldfart13]

Run it through VideoReDo and fix the stream errors and then use the resulting file. I used to have this problem with some encodes from my Daytek DP-30/Liteon 5001. Not anymore...

[mikiem]

bit of a guess, not having the files to play with, but here goes...

RE: your captured mpg2 files... The mpg2 spec is for the decoder only, so anyone can get there anyway they want as long as a generic player can play the files. So you get differences and sometimes you can *repair* a file using restream or dvdpatcher or even TMPGEnc MPEG Tools (forcing a file re-write). I've also had luck with DGPulldown.

MOre to the point though, if in your situation you have an audio/video mismatch - like say if you had the files on the timeline of an editor and could see the actual start times or lengths don't match -- then this could be carried over to joining the 2 files. The tracks for the clips would butt against each other, but if the video or audio ended 1st, that track for the added clip would start early or late. If this is what's happening, need to cut the longer file or pad the shorter one. Same thing could happen I imagine if the audio started late, but joining it might reset that delay to nothing.

The same sort of thing could happen if the original timing of the mpg2 files was misread. In that case the audio and video could match perfectly, but the software reading the files could thing the track was longer/shorter then it should be.

[kevingpo]

Thanks guys, I liked using VideoReDo & MPEG Video MPEG Wizard... but now my 14 days trial for VideoReDo is up and can't continue to use free trail of MPEG Video Wizard.

I am now trying ProjectX to demux, then MPEG2Cutt (German program), then TMPGEnc simple mux to remux them together, and am back to where I used to be. ... fingers crossed