vRecord Not Detecting Input

[ChrisNicols]

Hello!

I've used vRecord in a bunch of tape digitization setups in the past, but I'm using a pretty different one now and I am running into an issue. Whenever I use pass through mode or record, vRecord isn't picking up any input. I know my hardware is hooked up correctly because I am able to capture video using Media Express, but I want to use vRecord to make MXF files. I am attaching two logs from two different attempts. Hopefully I am just missing something obvious. Any advice would be greatly appreciated!

TEST_capture_options.log
TEST2_capture_options.log

[bturkus]

Hi @ChrisNicols I think the issue might be that MXF can't handle AAC audio encodings. I tried switching to PCM/Prores wrapped in MXF and also got a fail (this should work, I believe, but doesn't), but JPEG2000/PCM in MXF should be working fine

[ChrisNicols]

Thanks, Ben. Good to know I'm not the only one who is getting a fail when trying ProRes in MXF right now. I switched to PCM audio, but now I'm getting a different kind of error. vRecord is the only software I know of that has that as an option so I'm not sure where else to go. ProRes in MXF would just save so much on storage costs, or at least that's the dream.

[bturkus]

hi @ChrisNicols what version of vrecord are you running, and could you share and error messages and logs created when you're trying to create Prores/PCM in MXF?

[ChrisNicols]

Here are the error messages and the options log.

TEST_A_capture_options.log

TEST_A_LOG.log

[bturkus]

@ChrisNicols could you try switching video bit depth to 10, and maybe also turn off timecode?

[ChrisNicols]

Same result.
TEST_B_capture_options.log
TEST_B.log

[bturkus]

and if you switch over to MOV all is good?

[privatezero]

Hi @bturkus & @dericed, I've been able to reproduce this on my end as well - the problem seems to be linked to the prores_ks encoder. If I change vrecord to use prores instead of prores_ks it seems to eliminate the issue on my end. Should we add in a conditional check to not use prores_ks if the wrapper is set to MXF?

[dericed]

Hi @privatezero, it's been a while but I think we used the prores_ks encoder specifically to get a particular interlaced output. @kieranjol and @CSchloss385 helped on this testing at fe3b28c and 9fa5b68. But this decision was 8 years ago, so perhaps the 'prores' encoder has better interlacement support now.