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Their website claims compression ratios of 2-5 in the lossless mode, but the result of my (limited) tests so far show that it does worse than Huffyuv, not better.
My test video was a PAL VHS capture (YUY2, 720x576, 25fps, interlaced), which included typical VHS noise (not excessive). The clip was about 2000 frames.
I tried the default lossless mode and it /doubled/ the file size! This was probably due to VDub feeding it RGB frames, so next I enabled the "Convert to YV12" option and while that improved matters a lot, it still left the compression ratio a few percent worse than Huffyuv. With YV12 it should be doing better than Huffyuv if only because YV12 takes less space to begin with than YUY2.
I also tried enabling the "Interlaced source" option which claims to compress each field separately. That made little difference to the compression (still worse than Huffyuv), but did produce a video which was corrupted on playback both in media player and VDub. The picture was still recognisable, but something awful had happend to the interlacing.
It is possible that the problem was the noise. Perhaps the AlparySoft algorithm would do better than Huffyuv on a filtered video, but really I expect that if it can't keep up with Huffyuv on speed, then it should at least match Huffyuv on compression regardless of the circumstances.
On speed, in VDub this codec managed a frame rate on the above video of around 15fps on my 2.6GHz Celeron home PC.
This codec also crashes when I attempt to use it in my homebrew video testbed app. This could easily be a bug of mine, but I've had no problems with other codecs. It does however work fine in VDub so I'll reserve judgement on this issue.
In its own terms this codec is a credible performer, but I see no reason (so far) to prefer it over Huffyuv.
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