Why does Player report an "invalid frame rate" error for 30fps?

Anything and everything to do with DCP-o-matic.
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serpico009
Posts: 14
Joined: Tue Oct 04, 2022 3:40 pm

Why does Player report an "invalid frame rate" error for 30fps?

Post by serpico009 »

I just successfully encoded a DCP from a ProRes file with a frame rate of 29.97. I ran it through the Player's verification process, and it returned the following error under the SMPTE Bv2.1 tab:

The video asset ***.mxf uses the invalid frame rate 30/1.

Isn't that bit misleading? I know 30fps used to present a greater possibility of playback issues on some projection systems, but is that still the case in 2023?

Conversion to 23.976/24fps for this project won't be an option.
carl
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Re: Why does Player report an "invalid frame rate" error for 30fps?

Post by carl »

The SMPTE Bv2.1 standard (that these warnings are taken from) only allows 24, 25 and 48fps (for 2K) and 24fps (for 4K). I don't know what the real-world likelihood of 30fps working is these days.
serpico009
Posts: 14
Joined: Tue Oct 04, 2022 3:40 pm

Re: Why does Player report an "invalid frame rate" error for 30fps?

Post by serpico009 »

Thanks Carl. Is this version dated May 18, 2020 the most recent:

https://ieeexplore.ieee.org/stamp/stamp ... er=9161348
Carsten
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Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: Why does Player report an "invalid frame rate" error for 30fps?

Post by Carsten »

Yes. There haven't been many revisions of that document. 30fps will work on most systems (but not all). The verification in DCP-o-matic player, though, has to complain about this.
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