I wanna know if this GPU support WebM or not. If so, is it any better than H264?
of course, it will support decoding it, meaning you can view it on a HD3000. Encoding most probably, is also possible, though i haven't tried it myself!
So is it worthwhile to convert my library to WebM?
No,it won't be worthwhile.If you have seen the conclusion part of the link mentioned by ha14 while comparing both the formats,it says that VP8 took double the time to complete than H.264.
You will have no problem playing WebM videos with HD 3000. Anyway currently there is no Hardware support for deconding WebM format , its only software . As stand alone codecs H264 is supperior to WebM's VP8 , but VP8 seems better for online usage and it is rappidly growing (Google Bought the company)
So there's no hardware acceleration for WebM, right?
go here WebM scroll down to Hardware
It doesn't say anything specific though
the Intel HD Graphics 3000 supports the complete decoding of MPEG2 and H264 (VLD entries).
so it should support WebM also WebM designed for the web, Open Source License and without cost. H.264 is more experienced in this field and is better in quality.
First Look: H.264 and VP8 Compared
VP8 (WebM) vs H.264 (MP4) – December 2012
VP8 vs H.264 - Which One is Better?
WebM vs. H.264: A First Look