Finished DivX plays at double speed?

[humdinger]

Hi, I've been searching for ages for an answer on this one, maybe someone can help. I've been using Beyond TV to capture DVD compliant MPG2 streams (720x576 25fps approx 6.5mbit), which works really well. I decided I wanted to trim the ads and archive these for viewing on the Xbox as DivX, so I'm using MPG2-VirtualDub to open the file, deinterlace by removing one field and resize to 512x288 and then encode. I'm using 2-pass DivX 5 encoding with MP3 audio (LAME) and getting a nice 100mb (approx) file for a 20 minute video - though when I play it back, it plays at twice the speed I'm not really sure what might cause this, I've tried with different audio codecs, and no video filters (removed the deinterlace and resize) but the resulting file always plays back at high speed, both in WMP and XBMC. Any suggestions?

[Abond]

What bitrate you are using to encode the audio?

[humdinger]

44.1khz 128kbps

[Abond]

OK. Load the encoded file in Vdub (or Vdubmod) click File-file information. Look for something strange ( ). Or maybe use GSpot.

[humdinger]

will try that when i get home, thanks

[celtic_druid]

deinterlace by removing one field

Half the frames, but the same framerate = double speed.

[humdinger]

ah... ok, makes sense. odd though, that i've used this technique for converting from DV for ages and never had this problem.

[Abond]

Load the encoded file in VDub and look for the frame count. I bet it is the same as the source. Otherwise you will have also "jumpy" playback. Try folowing: demultiplex the video only and play it. Is it also double speed? If not then audio is guilty or multiplexing.

[humdinger]

Thanks for the help guys, problem solved. I used VDubMod instead of VDub MPG2, and everything worked fine. Weird...