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| Neo Neko |
 Posted: Aug 5 2002, 09:14 AM |
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VirtualdubMod Alpha tester
Group: Vdubmod Alpha Testing Team
Posts: 474
Member No.: 24
Joined: 11-July 02
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In the latest versions of virtualdub there is an option on the tools menu to create a "sparse AVI". You can also Expand a sparse AVI.  My guess is that the "sparse AVI" is all the header info and data chunks from the input AVI sans the audio and video data. I suppose you could figure out AVI overhead with this. But does anyone really know what it does? |
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| ChristianHJW |
| Posted: Aug 5 2002, 02:58 PM |
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Advanced Member
Group: Moderators
Posts: 1768
Member No.: 2
Joined: 7-July 02
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.. no idea, in fact ! Did you browse the docs coming with latest version ( dont have it installed here ) ?
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| phaeron |
| Posted: Aug 6 2002, 03:36 AM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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A sparse AVI is an AVI file that has had its audio and video data removed, and then its headers rearranged for better compression with zip. When unpacked on the other side, it exactly resembles the original AVI, except that the data blocks are all nulled. The reason for this feature is that if someone has portability troubles with other applications, I can ask them to send me a sparse AVI of the file and I can check that the AVI file that VirtualDub produced was valid. A 1GB AVI capture file can produce sparse file that is less than 100K when zipped. Needless to say, sparse AVIs are useless for transferring data.
I had an idea back for another type of sparse file, which was one that only included a single keyframe each from blocks of video delimited by scene changes. That would produce a sort of "blurb" video file, to make it easier to search for a scene. I never implemented it, though, because I wasn't quite sure what I would do with it.
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| robUx4 |
| Posted: Aug 6 2002, 08:09 AM |
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Unregistered
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Nice feature ! |
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| Neo Neko |
| Posted: Aug 6 2002, 08:29 AM |
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VirtualdubMod Alpha tester
Group: Vdubmod Alpha Testing Team
Posts: 474
Member No.: 24
Joined: 11-July 02
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Aaaaah. I see. And nice to see you here man. I see Christian's mail got through.  Seems you aprove. Christian had to sacrifice a bit for this.  But it is worth it. In time things will grow. |
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| drizztcanrender |
| Posted: Aug 9 2002, 03:53 PM |
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Unregistered
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Can this sparse avi be reconstructed to the original avi once it get's to the other machine?Or can that happen in some other way,maybe puting more information in it?
I mean if it could this could be a solution for network encoding or smth.
Ofcourse i'm usually full 'o **it so forgive me if this is a stupid question
Edit:type-o
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