[mythtv-users] Quicktime 1080p mov files smoother than 720p mkv (Debian)
Raymond Wagner
raymond at wagnerrp.com
Fri Apr 3 22:48:57 UTC 2009
Nick Rout wrote:
> x264 - core 67 r1127M 8d82fec - H.264/MPEG-4 AVC codec - Copyleft
> 2003-2009 - http://www.videolan.org/x264.html - options: cabac=1 ref=3
> deblock=1:-2:-1 analyse=0x3:0x113 me=umh subme=6 psy_rd=1.0:0.0
> mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0
> deadzone=21,11 chroma_qp_offset=-2 threads=6 nr=0 decimate=1 mbaff=0
> bframes=3 b_pyramid=1 b_adapt=1 b_bias=0 direct=3 wpredb=1 keyint=250
> keyint_min=25 scenecut=40 rc=2pass bitrate=3502 ratetol=1.0 qcomp=0.60
> qpmin=10 qpmax=51 qpstep=4 cplxblur=20.0 qblur=0.5 ip_ratio=1.40
> pb_ratio=1.30 aq=1:1.00
>
That file is CABAC at 3.5mbps, meaning it will use about as much power
to decode as CAVLC at 5mbps. Anything generated by Quicktime will be
CAVLC. Some other bits of interest:
ref=3
The more reference frames you have, the more buffer memory you
need to store them during decoding. Hardware decoders usually cannot
handle more than a handful of these. Three should be fine.
b_pyramid=1
X264 encoding profiles I've seen for hardware decoders tend to
have this disabled, and I know my PS3 won't play files with this
enabled, but VDPAU seems to play them just fine.
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