HD Content

[Gian]

I have a Firewire 800 setup 4 drives in RAID 0.

What about H264, I saw some HD movies using this particular CODEC.

Thanks

Gian

[samsc]

h264 like mpeg2 is rubbish for use in catalyst.

it uses interframe compression.

you cant access each frame without getting a dreadful performance hit - as you need to decode several frames to get one.

looping, changing in and out points. fast random access to individual frames - are all impossible - all things that are essential on a 'media server'.

some media servers use mpeg2 - but they have to convert the mpeg2 to a special format - with all i-frames...

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i have tested all this stuff thoroughly.

photojpeg 50% is the thing that works - and photojpeg is a really good codec.

[peppe]

i have tested all this stuff thoroughly.

photojpeg 50% is the thing that works - and photojpeg is a really good codec.

Beacon DigiGobos® will make the folder for Catalyst in 50% PhotoJPEG with
the coming HD series, I tested also and ended up with the same result as R!

[samsc]

Beacon DigiGobos® will make the folder for Catalyst in 50% PhotoJPEG with
the coming HD series, I tested also and ended up with the same result as R!

i have also done tests between photojpeg 30% and photojpeg 100%.
and there is a very significant performace hit when you go over 60% - and almost no change in the image

photojpeg performance is very sensitive to compression 'quality'.

nothing to do with catalyst - its the performance of quicktime.

[Spam Butterfly]

It's worth remembering that at the 100% quality setting Photo-Jpeg has 4:4:4 colour sampling in RGB 8 bit. At this level, it's very hard going on the processor to decode multiple streams of this... ;-) However, it is a fantastic and very efficient offline storage method. Unless you like storing your content in Animation Codec (which eats hard drive space), then it's a good bet.

Photo-Jpeg uses DCT intraframe compression technology, and therefore does not suffer from the problems that interframe compression based codecs (H264, Sorenson, Mpeg-2 etc) do.

Hugh
Altered State Ltd

[samsc]

photojpeg uses 4:4:4 sampling at every compression rate.

what dct algorithms do is throw away higher frequency information -

http://en.wikipedia.org/wiki/Jpeg
http://en.wikipedia.org/wiki/Discrete_cosine_transform

the sampling will be quite obscure and irrelevant to most peoples understanding.

[samsc]

I have a Firewire 800 setup 4 drives in RAID 0.

What about H264, I saw some HD movies using this particular CODEC.

Thanks

Gian

i doubt whether a four drive firewire raid is any faster than a single scsi disc.
but i havent tested your raid.