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Help with TV requirements for Broadcast : MXF OP1a file

Forum|Forum|2 years ago
October 30, 2023
4 replies
2477 views

Hello everyone,

Need a little help with this export.

The platform where my file needs to be uploaded requires the following (quote)

HD (1080/50i)

Container: MXF (OP1a)

Codec: XDCAM HD422

Format Profile: 422P@HighLevel

Frame size: 1920x1080

Aspect Ratio: 16:9

Frame rate: 25fps

Interlacing: Upper Field First

Bitrate: 50 Mbps

Chroma Subsampling: 4:2:2

GOP Lenght: 12 (M=3, N=12)

Audio

Format: PCM (Little Endian)

Channels: 2 (1 Channel per Stream)

Sample Rate: 48 kHz

Bit Depth: 16 bits/24 bits

In addition to that, video levels should be ITU BT.709 / EBU R103 - 2000

It's not the first time I upload videos to the platform but it has never been smooth sailing. This time I would really like to understand once and for all if I can export a file that meets all these requirements from Premiere or I have to use a different software.

What I do:

Video

Obviously I'm going with MXF OP1a with a XDCAMHD 50 Pal (422) Video Codec.

Frame rate, frame size, aspect ratio, interlacing are all correct.

No problem so far, then we have:

Bitrate: Premiere won't let me adjust bitrate (I assume it's fixed for this particular Format + Codec combo, and it's what XDCAMHD50PAL stands for)

Chroma subsampling: again can't be adjusted but I would imagine that (422) means just that.

GOP Lenght: I can force fixed lenght and closed GOPs but beyond that I can't manually adjust values.

Audio

Format: I'm only given the choice for Uncompressed audio

Sample Rate: 48000 Hz (can't be changed but that's ok)

Channels: 2 Channels

Sample size: can either pick 16 or 24

Video Limiter

My options are

100 IRE (SMPTE Range)
103 IRE

105 IRE (EBU R103 Preferred)

109 IRE (SDI limit)

I can't find a perfect match for ITU BT.709 / EBU R103 - 2000 so I just go with EBU R103 preferred)

My file gets automatically rejected. I can call and ask them to check and they'll fix it, but I'd really like to get on top of this once and for all; is this sheet just outdated, is Premiere lacking a couple settings, or am I doing something wrong here ?

Thanks in advance !

T.

This topic has been closed for replies.

R Neil Haugen

Legend

Jarle's right. You need the specifics of the rejection report.

Everyone's mileage always varies ...

J

Jarle Leirpoll

Legend

Specs from broadcasters are often outdated, and too specific. Premiere Pro will make OP1a exports that adhere to the standard, so you should not be able to create a non-standard file. It seems you've doen everyhting right, so I'm guessing that the rejection is caused by the audiuo or video levels.

I think you'll just have to ask them why the file is rejected - or you'll just be guessing. When you know why it's rejected, at least you have a chance to fix it. If it's the video levels, and no setting in the Video Limiter effect works, there are some brute force methods I can explain. But first you'll have to find out what it is about the file that upsets their system.