Black Magic Video Assist 12g

Please does anyone know if Black Magic Video assist supports 6k 30p and 24p video recording? I don't care much about 6K60p for now. I'm waiting to receive my Fuji Xh2s, and the camera can shoot BRAW externally, but before I invest in the video assist, I need to make sure it can record 6k. I know 4k works.

Check your camera manual for the Fujifilm X-H2S. Dial Movie Mode / Menu button Ok / HDMI / scroll to RAW Output Setting / RAW Output Setting Blackmagic / select your resolution and frame rate.

Edit
Sorry the camera manual doesn’t appear to include Blackmagic, so let’s just look in the camera firmware menu to see.

By the way, the camera doesn’t record or output 30p. It does do 29.97 fps.

My question was whether Black Magic video assist 12g supports 6k recording. I know Fuji Xh2s will record BRAW externally. Maybe it is not activated yet, but it is coming.

Prores Raw and Braw at 6.2K to the Ninja and VA respectively.

Good Luck

Praw&Braw.png (106.11 KiB) Viewed 2466 times

Thanks, Howard. That’s very good. Not in the current manual explicitly as there’s no mention of Blackmagic but it is in the list of features.

Prores Raw and Braw at 6.2K to the Ninja and VA respectively.

Good Luck

Praw&Braw.png

Thank you, Howard. That's the info I was looking for.

Did my tests related to lack of audio sync between the BMVA12G7 with independent audio and a camera’s audio.

Test setup 30 fps 180 degree shutter:
- BMPCC4K 7.9 SLR Magic 32mm APO PL recording to Wise 1TB Portable SSD HFS+
- BMVA12G7 with Sennheiser 416MKH U48 XLR mic recording to Wise 128GB SDXC exFAT
- MixPre-6 II with dual Line Audio Design CM-4 XLR mics recording to Sound Devices 32GB card exFAT
- Tentacle Sync jam camera & MixPre.

Tested:
1) tested for presence of audio drift for a 35’ recording comparing BMPCC4K camera audio, BMVA12G7 416 XLR audio, and MixPre-6 dual CM-4 XLR audio (32bit) with subject in low-key conversation as if shooting a documentary and
2) very quick book drop test to see if audio offset required for all clips.

Edit
Files are still copying over from my media to my RAID5. Can’t hurry love or file transfers! Will post results later Thursday hopefully!

I’ve done my analysis from yesterday’s recording described in the previous post.

Audio Drift
At least based on my equipment, there is no visible audio drift in recordings for a 35 minute clip. So the behaviour of the audio over time as recorded by the BMPCC4K, the BMVA12G7, and the MixPre-6 II are consistent.

However what is interesting is that there are discrepancies that are informative.

In the following photos of the Timecodes:
V1 and A1 are from the BMPCC4K,
V2 and A2 are from the BMVA12G7, and
A3, A4, A5, A6 are the MixPre-6 II.

Here is a photo of the video and audio a few seconds from the beginning.


Here’s near the end:


Here’s the end of the timeline:


Here’s the start of the timeline:


So you can see there’s a frame of video delay for the video of the BMVA12G7 and a two frame delay for the audio, but after that it stays the same, no drift.

The MixPre-6 II looks like it begins with a frame difference than the BMPCC4K recording from its camera audio. However the Timecode numbers which count frames are not as precise as an audio recording. I was running 30 fps and I nudged the audio tracks 1 frame less 3 subframes; so it’s a very small delay. You can see it in the audio waveforms but it’s small enough, your ear can’t detect an issue on playback.

This test also illustrated the accuracy of the Tentacle Sync with no loss during 35 minutes (actually longer as I did other tests too). I looked at the Tentacles today about 30 hours after setting them yesterday and they were only off a tiny bit, much lass than a second. I think they claim a loss of a frame in 24 hours.

Edit
I did another 30 minute clip test today and the results were a repeat of yesterday. There is no drift on the BMVA12G7 in my tests. The BMVA12G7 typically begins a frame after the BMPCC4K and any direct audio XLR connected to the BMVA12G7 typically is another frame late. Not always but almost always.

Just something to be aware of if your video is using multiple sources of recordings. Using Timecode is reliably a huge help. Using a high quality external audio recorder is very helpful for several reasons but audio might be a frame off.

The MixPre seems to me a better alternative to than feeding XLR audio to the BMVA12G7. But I understand that’s not always feasible in many situations where mobility is a factor. You can mount the MixPre to your tripod or camera, but that’s not very manageable if your camera is shoulder-mounted.

One final result regarding a book drop test and sync with the BMPCC4K, BMVA12G7, and MixPre-6 II:

Method
Recorded ProRes HQ in 4K 2160p30 on the BMPCC4K and 1080p30 on the BMVA12G7 with audio on the MixPre-6.

As the photo below illustrates, the MixPre audio of the book hitting the floor aligns with the video clips of the book; all timecodes were identical 12:13:59:12 so kudos to the MixPre and the Tentacle Syncs.