[mythtv-users] Raspberry Pi as remote transcoder

[Raymond Wagner]

On 8/30/2012 18:27, Yeechang Lee wrote:
> Raymond Wagner <raymond at wagnerrp.com> 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.