[FFmpeg-devel] h263 - svq3 optimizations
Tue Mar 17 15:07:31 CET 2009
Yohann Martineau wrote:
> On 3/17/09, Panagiotis Issaris <takis.issaris at uhasselt.be> wrote:
>> On Tuesday 17 March 2009 13:38:02 Jason Garrett-Glaser wrote:
>>> On Tue, Mar 17, 2009 at 4:16 AM, Yohann Martineau
>>> <yohann.martineau at gmail.com> wrote:
>>>> h263 and sorenson spark have some common elements. Both have picture,
>>>> MB and block layers. And it seems that block layer is also very
>>>> similar between those two codecs.
>>>> Do you think it would make sense to work on transcoding optimizations
>>>> between those two codecs?
>>> Perhaps you meant H.264? SVQ3 is quite similar to H.264, not H.263.
>> No, he's right, Sorenson _Spark_ and H.263 are actually very similar. They
>> differ mostly in header structure and ranges of the coefficients.
> Actually, I meant sorenson spark, which is used for adobe flash player
> (9+) webcam video streaming. I thought it was SVQ3, is it SVQ1?
> There's a page on the wiki about sorenson spark, but it does not say
> if it's svq1 or svq3 (or something else?):
> I've read swf 10 format specification on adobe site and it seems that
> svq3.c matches the video chapter, but I may be wrong.
Sorenson Spark is almost h.263. A bitstream filter might be able to covert directly to h.263/mpeg-4. SVQ3 is almost h.264, SVQ1 is a custom beast.
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