Bits/(Pixel*Frame) in h264

[pasta03]

Hey!
In the xvid coincidence if we want to have the wonderful quality Bits/(Pixel*Frame) should take out about 0.28 - 0.30.

My question is:
what should be Bits/(Pixel*Frame) for the h264 codec so that the quality was wonderful.

[nurbs]

http://forum.doom9.org/showthread.php?t=109907&highlight=bits+pixel+frame

[DarkZell666]

The [Bits/(Pixel*Frame)] (aka. bpf) doesn't mean much, it all depends on the source.

However, IIRC, for h264, ~0.15 looks good.

[Sagittaire]

doesn't mean anything ...

little example:
http://jfl1974.free.fr/upload/superman.mp4
http://jfl1974.free.fr/upload/XMenIII.mp4

video 1920*1088 at 2 mbps
BPF = 2 000 000 / (1920 *1088 * 25) = 0.04

Quality is not so bad for BPF at 0.04 ... isn't it ... lol

[DarkZell666]

Lol, sorry, I forgotten to mention: at standard definition (<720x576), ~0.15 looks good ... =)


But really, those samples are a real CPU-trashing experience ... :x

Don't tell me they play smoothly on your system ... O_O

[Mc Onyx]

I was quite suprised they play on mine, are those samples encoded by x264 or are they Apple MOV in mp4 container?

[Blue_MiSfit]

Pretty nice, but the Xmen trailer was very slow decoding on my 3500+ venice even with CoreAVC Pro. What settings were used to encode that? It feels like CABAC to me!! :)

[smok3]

superman is:

x264 - core 43 svn-394M - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x133 me=hex subme=6 brdo=1 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 chroma_qp_offset=0 slices=1 bframes=3 b_pyramid=1 b_adapt=1 b_bias=0 direct=2 wpredb=1 bime=1 keyint=250 keyint_min=25 scenecut=40 pass=1 crf=25 rceq='blurCplx^(1-qComp)' qcomp=0.75 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.25 pb_ratio=1.33

so yep, there is cabac :) and this was quality based encoding as it seems, experts may tell you more...

[Blue_MiSfit]

CABAC murders HD decoding speed.. :)

Not a bad trailer though. I found it killed a bit too much detail on faces etc in high complexity scenes. I was amazed by the detail on Patrick Stewart's eye-bags though :D

I would probably do it at CRF 22 or something :)

[akupenguin]

The cost of cabac is proportional to bitrate, while the cost of most other parts of the codec is proportional to the number of pixels. So in that .04 bpp stream, cabac makes less speed difference than it does normally.

[arfster]

Not a bad trailer though. I found it killed a bit too much detail on faces etc in high complexity scenes.


Bit much to ask for significant detail in 1.5mbit 1080i :D

[Blue_MiSfit]

@akupenguin:
thanks for the clarification, I didn't realize that!

1.5 mbps not enough for perfect 1080i
nonsense!!!! BACK TO WORK!! :devil:

Seriously though, I was pretty impressed. A tiny bit of noise on playback helped it look better too...

~MiSfit