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Old 6 Mar 2002, 09:25 PM   #1
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Default Freeze frames in re-encodes (repost)

Four months on, and my problem went away but is coming back into 1 in every 2 recompresses - it looks like these forums have picked up a lot more users since November 2001, so I was hoping for any further suggestions on the issue. See below for original post.

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I've had a very frustrating issue related to divx for the last few weeks. The problem arises when using virtualdub to recompress an avi using the low motion divx 3.11 codec. The result always contains corrupt frames, even though the source avi was perfect.

I've tried almost everthing to cure it - from reinstalling the codec to even reinstalling Windows 2000 and downloading virtualdub again, the same happens. I'm beginning to think its a hardware issue but I've not added anything new recently.

Another strange thing is, if I use fast motion 3.11, the result is fine - no corrupt frames at all... I'm completely baffled.

Any suggestions would be appreciated.
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Old 6 Mar 2002, 09:32 PM   #2
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Would be a good thing if you share with us your settings so that we can all have a look at what's happening.

On the other hand, you might like to use the SBC encoder nandub. It basically makes use of the 3.11a codec, but in a smarter way (Variable bitrate).
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Old 6 Mar 2002, 09:43 PM   #3
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Settings.. not much to tell really. Tried all the following resulting in the same freeze-frames:
- any bitrate using the low motion codec
- any source resolution
- both standard and vbr mp3 audio sources
- any version of virtualdub
- nandub (to answer your question)

Hardware is an Abit KG7, Athlon TB 1400, 512MB DDR, GeForce 3 Ti200 gfx.

Cheers
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Old 6 Mar 2002, 09:51 PM   #4
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Corrupt as in freeze frames?
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Old 6 Mar 2002, 09:56 PM   #5
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Yes, unreadable frames in the output result. Freeze in media player, or decompression failure when looking at it in virtualdub.
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Old 6 Mar 2002, 10:16 PM   #6
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Never had this before, so can't really elaborate.

Try running DivFix with it, or enabling the anti-freeze feature in nandub. Perhaps, also, you were using too low a bitrate? If I remember correctly, the resolution of the video has to be in multiples of 16.
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Old 6 Mar 2002, 10:22 PM   #7
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Yep, I've made sure on the source resolution - a fairly common 640x352 resolution still ends up with ff

Also tried many different bitrates as I mentioned.

Thanks for the replies
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