Fail during 4k anamorphic export in FCPX and Compressor

[Leslie Woo]

I never thought of that. I’ll try with a fresh project/event/clip without effects and see if that’s more successful.

Another update: I’ve managed to get a 4698px x 1999px render to export successfully but anything over 1999px in height has failed repeatedly.

[Leslie Woo]

Tried with fresh everything to export 5120×2160 (FCPX has it as a 5k project default setting) and no luck from direct export from FCPX or from ‘send to compressor’.

I’ve managed to get a 4096×2160 shorter clip successfully exported as well as a 4698×1999 clip but still can’t get anything larger to work.

If there are any other theory’s I’d love to hear them.

Thanks guys

[Leslie Woo]

Hey Jeff,

Do you know the format you were able to export your larger clips to?

Was it H264 or was it another format?

There appears to be a maximum output width on H264 of 4096×2304

Would you mind taking a look to help confirm the theory?

[Jeff Kirkland]

I tested it with ProRes 422 LT. You are 100% right in that h.264 doesn’t support resolutions above 4k.

I’m wondering, apart from exporting a 1:1 master file which you’d want in ProRes anyway, do you need to create a h.264 at that odd size? If it’s not a standard 4k/HD/SD resolution, nothing’s really going to know what to do with it.

Jeff Kirkland | Video Producer | Southern Creative Media | Melbourne Australia
http://www.southerncreative.com.au | G+: https://gplus.to/jeffkirkland | Twitter: @jeffkirkland

[Leslie Woo]

Hi Jeff,

I agree its not of much use. I was trying to debug the problem, not understanding where the error was coming from. I had not found any information about 4K in true anamorphic ratio, only black bars which didn’t fit my project goals so I was curious about why I wasnt able to get a 2160height (4K) and not a 5076width

That aspect ratio is nearly identical to FCPX 5K default setting.

since I’m able to export a 4698×1999 I get all the info I need and Youtube recognizes it as 4K which is important to my client.

I know most people will end up watching on their mobile at 480 or 720 if we’re lucky but at least there will be the option for UHD playback.

Thanks for your help testing things out!