Film-Tech Forum ARCHIVE: 50 Fps Playback!

This is topic 50 Fps Playback! in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Lucas Iaccarino (Member # 8762) on 03-06-2018, 04:41 PM:

Hello

I`m writing you today because I`m going to receive a 50 fps DCP and i am asking myself if I`m going be able to playback it. Actually I`m operating with Doremi ShowVault (IMB) and Dolby Dss220, but I had been before in problems with some DCP with bitrates over 250 Mbps

The projectors are all SERIES 2, so I think that everything is going to be Ok.
What would you say?

Thank!

Posted by Carsten Kurz (Member # 5396) on 03-06-2018, 05:45 PM:

Should work on both machines. Neither the Doremi IMB nor the Dolby CAT745 should have issues with data rates >250MBit/s. I think the Doremi IMB maxes out around 450MBit/s. For the CAT745, I have never seen an 'official' max decoder data rate, but it should cope with similar rates easily.

The Dolphin/HD-SDI boards did not like rates close to 250MBit/s.

As common 2k/3D uses 48fps at below 250MBit/s, it is probably not even necessary to go beyond that number for 50fps 2D.

- Carsten

Posted by Steve Guttag (Member # 268) on 03-07-2018, 06:26 AM:

The CAT745 should be good up to 500Mbit/s. 50fps is also listed as a supported frame rate for the CAT745 (and the CAT862, for that matter).

Posted by Carsten Kurz (Member # 5396) on 03-08-2018, 06:13 PM:

Theres a remark in the Dolby 4.9.096 release notes concerning 50fps, but I am not sure wether that actually affected 50fps playback in pre-4.9 versions:

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Fixed an issue that incorrectly marked 50 fps as unsupported on the CAT745 media block. This frame rate is now correctly supported.
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- Carsten