12-bit uncompressed 2K direct-to-disk recording at DVinfo.net

Karina Nemuhina · November 6th, 2006, 04:47 PM

In Ari Preselers Post:2K Digital Cinema Camera Streamlines Movie and HD production, he mentioned 12-bit uncompressed 2K direct-to-disk recording.
Pls can you elaborate on that.
Thanks.

Ari Presler · November 8th, 2006, 09:52 AM

Karina,

The SI-2K Mini always generates 12-bit RAW data, which is transported into the Core 2 processor over Gigabit Ethernet at rates up to 100MB/sec (in overcranking).

The user has the option to encode the data to CineFormRAW 2K Digital Intermediate or as 12-bit RAW Uncompressed.

Ari Presler · November 8th, 2006, 09:59 AM

You can take the uncompressed file and save it as a sequence of RAW frames as DNG or DPX sequence.

Ari Presler · November 8th, 2006, 10:03 AM

We do have a large RAM buffer to account for a slower speed HDD system. However, if you want to record long shots in uncompressed you will need to have a fast drive or use two in a RAID.

Karina Nemuhina · November 9th, 2006, 06:40 PM

Thanks for the info, Ari.

Karina Nemuhina · November 25th, 2006, 05:55 PM

Regarding Capturing Uncompressed 12-bit raw images with SiliconDVR in 12-bit uncompressed RAW Mode,my questions are:

1. Using RAM buffering capabilities with the 160gb HDD catridge, Exactly how short(or long) are the 12-bit sequences in terms of seconds & minutes?

2. Can an External 5-disk SATA 3G Raid array capture these 12-bit raw images continously?

Ari Presler · November 26th, 2006, 07:09 PM

The record duration in 12-bit mode using USB HDD will depend on the capture mode and frame rate. This will effect how quickly you fall behind and use up the RAM buffers. For example, If you are captuing at 70MB/sec and were recording out to HDD at 30MB/sec, you would be falling behind at a rate of 40MB/sec. If you have 1.2GB of memory allocated for RAM buffering you will record for approximately 30sec.

Yes. If you use an external storage system which can sustain the 70MB/sec you can record continuously.

Note: Based on our recent tests with the latest improvements in the CineformRAW codec we really do not see much, if any, need for the uncompressed mode (but it is in there for those who wish to try it for themselves).

November 6th, 2006, 04:47 PM	#1
Karina Nemuhina Regular Crew Join Date: Sep 2006 Location: Russia Posts: 38	12-bit uncompressed 2K direct-to-disk recording In Ari Preselers Post:2K Digital Cinema Camera Streamlines Movie and HD production, he mentioned 12-bit uncompressed 2K direct-to-disk recording. Pls can you elaborate on that. Thanks.

November 8th, 2006, 09:52 AM	#2
Ari Presler Silicon Imaging Join Date: Apr 2006 Location: New York or Hollywood Posts: 214	12-bit Uncompressed RAW Karina, The SI-2K Mini always generates 12-bit RAW data, which is transported into the Core 2 processor over Gigabit Ethernet at rates up to 100MB/sec (in overcranking). The user has the option to encode the data to CineFormRAW 2K Digital Intermediate or as 12-bit RAW Uncompressed.

November 8th, 2006, 09:59 AM	#3
Ari Presler Silicon Imaging Join Date: Apr 2006 Location: New York or Hollywood Posts: 214	12-bit Uncompressed RAW You can take the uncompressed file and save it as a sequence of RAW frames as DNG or DPX sequence.

November 8th, 2006, 10:03 AM	#4
Ari Presler Silicon Imaging Join Date: Apr 2006 Location: New York or Hollywood Posts: 214	12-bit Uncompressed RAW We do have a large RAM buffer to account for a slower speed HDD system. However, if you want to record long shots in uncompressed you will need to have a fast drive or use two in a RAID.

November 25th, 2006, 05:55 PM	#6
Karina Nemuhina Regular Crew Join Date: Sep 2006 Location: Russia Posts: 38	12-bit Raw Images Data Acquisition Regarding Capturing Uncompressed 12-bit raw images with SiliconDVR in 12-bit uncompressed RAW Mode,my questions are: 1. Using RAM buffering capabilities with the 160gb HDD catridge, Exactly how short(or long) are the 12-bit sequences in terms of seconds & minutes? 2. Can an External 5-disk SATA 3G Raid array capture these 12-bit raw images continously?

November 9th, 2006, 06:40 PM	#5
Karina Nemuhina Regular Crew Join Date: Sep 2006 Location: Russia Posts: 38	Thanks for the info, Ari.

November 26th, 2006, 07:09 PM	#7
Ari Presler Silicon Imaging Join Date: Apr 2006 Location: New York or Hollywood Posts: 214	The record duration in 12-bit mode using USB HDD will depend on the capture mode and frame rate. This will effect how quickly you fall behind and use up the RAM buffers. For example, If you are captuing at 70MB/sec and were recording out to HDD at 30MB/sec, you would be falling behind at a rate of 40MB/sec. If you have 1.2GB of memory allocated for RAM buffering you will record for approximately 30sec. Yes. If you use an external storage system which can sustain the 70MB/sec you can record continuously. Note: Based on our recent tests with the latest improvements in the CineformRAW codec we really do not see much, if any, need for the uncompressed mode (but it is in there for those who wish to try it for themselves).