[mythtv-users] Little OT: RealTime Parallel Multi-PC Transcoding
belcampo at zonnet.nl
Wed Jun 16 11:55:59 UTC 2010
Jean-Yves Avenard wrote:
> On 16 June 2010 02:22, belcampo <belcampo at zonnet.nl> wrote:
>> In PAL-land, where I live, we've got 25fps and a GOP-size of 12frames.
>> None of my DualCore CPU's can transcode, with ffmpeg, in realtime to desired
>> h264 quality. But I do have 2 more DualCores sitting there doing nothing.
> What quality is that ?
> I'm asking, because for playing videos on my iPad, I use AirVideo.
> It encodes on the fly using ffmpeg any mpeg2 or divx source
My source is 1920x1080i from the BBC, from mpeg2 the problem is much less.
> 1024x768 at their maximum quality
my settings are:
Encoding settings : cabac=1 / ref=2 / deblock=1:0:0 /
analyse=0x3:0x113 / me=umh / subme=4 / psy_rd=0.0:0.0 / mixed_ref=1 /
me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 /
deadzone=21,11 / chroma_qp_offset=0 / threads=1 / nr=0 / decimate=1 /
mbaff=0 / bframes=0 / keyint=250 / keyint_min=25 / scenecut=40 / rc=abr
/ bitrate=1672 / ratetol=2.4 / qcomp=0.50 / qpmin=22 / qpmax=27 /
qpstep=3 / ip_ratio=1.25 / aq=1:1.00
> sufficiently fast to play without
> lag on a 2.6GHz Core2Duo.
> When I queue an encoding for later watching, your typical 40 minutes
> videos is encoded in about 20 minutes..
> The result certainly looks good to my eyes
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