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  1. I'm using Avidemux to trim some lossless files (Lagarith). These are VHS tape captures that are aprox. 2 hours and have like 2-5 clips each. I just want to roughly cut them down to size, but I want to be careful here because these will be the master clips that I'll keep archived and use to encode.

    I'm using 'copy' for both video and audio stream, but in the AVI output it has an option for Avi, OpenDML and Auto. If I use Auto my concern is I'll have a mix of both formats so I'd rather chose one or the other. Is AVI vs OpenDML better for archiving? I did a search and read a bit about how OpenDML is sort of AVI 2.0, but in some really, really old threads I read people had issues. I wonder what the current though is? Sorry if this is a newb question.

    Thanks.
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  2. The main difference is that the original AVI spec didn't allow for files over 4 GB. Among other things, the ODML extensions allow for files larger than 4 GB. That's probably the main difference between the two as far as AviDemux is concerned.
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  3. Member Cornucopia's Avatar
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    All modern apps that work with AVI should be able to fully support the OpenDML enhancement to the spec.

    Scott
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  4. Ahhh ok, thanks for the explanation.
    So if I left it on Auto it would have defaulted to OpenDML since these are mostly large files anyway. I'll just go ahead and use the OpenDML option so all the files are consistent.
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  5. If anyone's interested I tested both options and the resulting videos look the same to my eye. The only thing I really noticed was that in Windows Explorer folder view the Avi option clips produced a thumbnail of the first frame of the video while the OpenDML clips did not. Further AviDemux on Auto will use the Avi option for smaller clips and OpenDML on larger clips.

    I'm sticking with the OpenDML option for all files.
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  6. I don't think I've seen any program have a problem with ODML AVI in 20+ years.
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  7. Another thing I noticed is that the audio in these OpenDML files isn't seekable. I've only tested in Window Media Player but when you advance the video the audio drops out. The audio is all there, you just have to watch from start to stop without interruption which is mildly annoying.
    The avi files from the original capture (amarectv) are seekable and well over 4gb. So it might be more of an AviDemux rather than OpenDML problem. I think I'll test something else to trim the videos - maybe Virtualdub.
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  8. I've never seen problems like that with the audio in ODML AVI (though I don't use AviDemux). What codec is used for the audio?
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  9. Its uncompressed PCM

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  10. I wouldn't expect problems with uncompressed PCM. But then again, AviDemux is full of bugs.
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  11. Is Virtualdub the better choice or something else?
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  12. Yes, I would use VirtualDub for simple cut/paste editing of Lagarith/PCM AVI. Use Video -> Direct Stream Copy mode.
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  13. Thanks, VirtualDub worked much better, well I used VirtualDub 2.0. I didn't see any explicit OpenDML options as there was in Avidmux but the files over 4gb didn't have any seek issues and displayed properly in windows explorer. I did have to choose save as 'avi handled by ffmpeg' vs standard 'avi' which gave me some issues (no video).
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  14. Video -> Save As is ODLM2 AVI
    Video -> Save Old Format AVI is the original spec
    Last edited by jagabo; 12th Mar 2019 at 20:47.
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  15. GSpot can tell you if an AVI is 1.0 or ODML AVI 2.0. You can also see the dmlh chunk in the AVI file with a hex editor. For example with VirtualDub's Hex Editor and RIFF chuck tree viewer:

    Image
    [Attachment 48357 - Click to enlarge]
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  16. Mr. Computer Geek dannyboy48888's Avatar
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    The only time I had a hiccup with opendml is on standalone players. It will play to the 2Gb mark and stop. For archiving on a PC you should have no issues, I capture to AVI with fraps etc and had no problems. Any player besides windows media player I've had no issues with as well. Never had windows media player act right on anything since its been out lol.
    if all else fails read the manual
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