[Scummvm-devel] DXA file format for videos
Max Horn
max at quendi.de
Sun Apr 30 06:04:03 CEST 2006
Am 30.04.2006 um 01:04 schrieb Eugene Sandulenko:
[...]
> New results:
> BS1: 72MB video
> BS2: 146MB video
[...]
> Ratios:
> against Low Q MPEG2:
> ZMBV MNG DXA
> BS1: 2.9x 2.1x 2.25x
> BS2: 6x 5x 5.4x
>
> against High Q MPEG2:
> ZMBV MNG DXA
> BS1: 1.4x 1x 1x
> BS2: 2.3x 1.9x 2.1x
>
> Resulting archives with OGG audio:
> BS1: 73MB
> BS2: 147MB
The original Smacker files:
BS1: 60 MB (45 MB for low quality variant on my CD)
BS2: 124 MB
Our current video packs:
BS1: 34 MB
BS2: 30 MB
>
> So, may we switch to lossless DXA?
Well, we still are talking a 5x increase compared to our current BS2
video pack, and a 2x increase for the BS1. Granted, the quality is
probably better (maybe even a lot -- I never had a chance to see the
uncompressed versions of the videos). Still, if we switch the format
and at the same time ditch support for the MPEG2 variants, we are
"forcing" a lot of people to re-download those cutscene packs.
From the coders point of view, of course the nicest and cleanest
solution would be to just ditch MPEG2 support completely in favor of
using DXA exclusively. From the point of view of a "customer",
though, having both supported in parallel (at least in the next
release) definitely would be preferable...
Cheers,
Max
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