raymond at wagnerrp
Aug 30, 2012, 4:39 PM
Post #13 of 14
(2834 views)
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On 8/30/2012 18:27, Yeechang Lee wrote:
> Raymond Wagner <raymond [at] wagnerrp> says:
>> Gavin Hurlbut has been working on a hardware accelerated commercial
>> flagger, using VDPAU for decoding, and OpenCL for video
>> processing.
>
> While I wish Gavin luck with this ambitious effort--not least because
> doing so would help lead to hardware-assisted transcoding--isn't
> commflagging a more or less solved problem from a computational
> standpoint?[1] With the experimental option enabled to permit the
> commflagger to work on abridged data, I see speeds in the 120-140 fps
> range for not-yet-finished high-definition recordings--i.e., the
> flagger is spending 75% of its time waiting for more video--and 1000
> fps for completed HD recordings, all on six years-old hardware.
That sounds like you've got the "experimental speedup" enabled for the
commercial flagger, which does a high speed, low resolution decoding of
the video, and then performs commercial detection on the low resolution
output. As last I heard, FFmpeg has removed this special decoding mode,
so that is not an option with future re-syncs, and commercial flagging
will be drastically slower.
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