hard drives

[Spam Butterfly]

This rather supports Richard's earlier assertions. The Blackmagic codec is an Uncompressed codec. The processor is not doing much work to decode this. With uncompressed video you need lots of drive bandwidth to get it off the drive, which is why RAID arrays are essential for uncompressed work.

With compressed video, it's the physical speed that the data can be accessed on the hard drives patters that's the key - not the sustained data rate. RAID does not help for this.

Photo-Jpeg performance has nothing to do with drive speed at all. Photo-Jpeg is an off-line format. It's generally used by content providers because it provides great compression ratios with a minimum loss of quality. However, it's heinously processor intensive to decode and encode - hence the shit performance.

Hugh

[tylerr]

So on that note should be be converting our files to some other format that the one originally specified by High End? I believe that it was Photo Jpeg medium quality.

Tyler http://chaldee1.gotadsl.co.uk/~richa...quote=1&p=949#

[litemover]

So on that note should be be converting our files to some other format that the one originally specified by High End? I believe that it was Photo Jpeg medium quality.

Tyler http://chaldee1.gotadsl.co.uk/~richa...quote=1&p=949#

I know I'm going to be now. Getting full speed accross the board without barely any compression is worth it for me.

The downside is that it takes a lot more space and you need a multi drive zero striped array.

Christian

[Spam Butterfly]

I guess if you have the budget for the RAID array, then go uncompressed, if it's giving you the performance and quality you are after.

However DV PAL/NTSC is still the best codec to use for Catalyst, performance, and always has been. At least in Europe, DV PAL's 4:2:0 colour sampling gives better perceived colour than NTSC's 4:1:1 - hence I get less grief about this, and Tyler, I would keep your files in DV NTSC.

The content that High End has supplied in the past has been a mixture of DV and DVC Pro in NTSC format, + photojpeg stuff at medium quality.
The original v.1 media servers made in London had Photo-Jpeg content in Best quality, which was the format that it was delivered to me in (and in PAL hehehehe).

Photo-Jpeg has a number of drawbacks - the most significant is that it takes considerably more grunt to decompress it, hence this discussion. However, it has one significant advantage, other than being a great off-line format, which is that it supports resolutions other than standard definition. If you have a series of images that you want to use in your show, you may find that it's better to render these as a 'slide show' movie, and you'll get better performance.

[samsc]

The original v.1 media servers made in London had Photo-Jpeg content in Best quality, which was the format that it was delivered to me in (and in PAL hehehehe).

which will not work on multiple layers in catalyst v3- you get the worst of both possible worlds. big files and slower decompression.

[tylerr]

Has anyone tried a 15k RPM drive? Is there any amazing differance in preformance for twice the proce of a 10K?

Tylerhttp://chaldee1.gotadsl.co.uk/~richardb/upload/newreply.php?do=newreply&noquote=1&p=958#

[samsc]

i dont think they have quite become available yet.

every manufacturer is releasing faster drives - whether they are faster for doing this type of thing remains to be seen.

[Spam Butterfly]

I have a 15K Seagate Cheetah. No real different.

Hugh