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post #91 of 92 Old 07-14-2014, 08:37 PM
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Well, after some quick testing with some random MKV files I had kicking around...

Exact copy of the original yielded 100% efficiency.
Remuxing (removing chapter markers) resulted in ~99% efficiency.
Remuxing (removed audio track) resulted in ~8% efficiency.

So it appears that the audio and video streams are indeed interleaved in MKV, enough so that block level de-dup doesn't do much for them.

I haven't tried with MP4 or M2TS but I suspect the results will be similar. But it will have to wait until tomorrow because I'm tired and I'm going to bed.

I think I'll also check between containers to see how will that works with the block level de-dup. Since the streams in the containers are the same I wonder how much of the data will be shared differing containers.

RAID protection is only for failed drives. That's it. It's no replacement for a proper backup.
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post #92 of 92 Old 07-14-2014, 09:27 PM
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Quote:
Originally Posted by ajhieb View Post
Well, after some quick testing with some random MKV files I had kicking around...

Exact copy of the original yielded 100% efficiency.
Remuxing (removing chapter markers) resulted in ~99% efficiency.
Remuxing (removed audio track) resulted in ~8% efficiency.

So it appears that the audio and video streams are indeed interleaved in MKV, enough so that block level de-dup doesn't do much for them.

I haven't tried with MP4 or M2TS but I suspect the results will be similar. But it will have to wait until tomorrow because I'm tired and I'm going to bed.

I think I'll also check between containers to see how will that works with the block level de-dup. Since the streams in the containers are the same I wonder how much of the data will be shared differing containers.
All those formats interleave audio and video. I think the main difference will be that different container headers throw the blocks out of alignment. I've seen some systems that handle alignment changes, like rsync and Riverbed Steelhead, but I doubt that it would be worthwhile for CrashPlan to go to that extent.
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