[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...


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