On 18 Jul 2011, at 1704, Andrew Z wrote: > Phong Nguyen <[email protected]> wrote: > Even an old Sempron will probably decode most AVIs (MPEG-4 ASP?) with low CPU > load; shuffling things to and from the GPU probably won't buy you much and in > this case probably costs you overhead. Compressing to MPEG is also probably > being done in software and not on the GPU; I'm not aware if there is any > Linux support for GPGPU-accelerated encoding even with VAAPI. > > On 18 Jul 2011, at 1529, Andrew Z wrote: > > > I spent some silly amount of time trying to get all three to perform > > together. > > Finally i guess i succeeded, but the results are nowhere to be excited > > about. > > > > It takes about 40 minutes to transcode of ~800MB avi to mpeg on my ancient > > Sempron system with 2GB and GT240(512MB) with GPU enabled and ~30minutes > > w/o GPU. The CPU load is ~80% (GPU enabled) and ~99% (no GPU involved). > > > > I posted results on vlc forum, wondering, pr > etty > much "why bother with vaapi", but i guess the question won't be answered. > > > > > Yet, i'm curios what's your experience and thoughts on the matter? > > > > Andrew > > > So you think that round trip to gpu for decoding is not worth an effort? > dazes on the results its looks this way. But then why bother with this > functionality at all? > --
If you are decoding H.264 content to the screen it might well be worth it, particularly on something like a Sempron and especially if you wish to play high definition content. I don't know if you can decode from the GPU to a non-screen target.
