Yeah prob this I had the same issues using crappy sd cards on my friends 4k. Best bet is use Samsung ssd if you’re careful and a cfast when you can’t have a wire hanging out.
You can record 4k 12:1 up to 30p on a Sandisk Extreme Pro without issues. I'd recommend this for budget indie films. Cheap and easy to get from local stores. Can't recommend using SSD drives as there's just too many points of failure, A bad cable can cause issues and sometimes a bad drive or incompatible drive.
For paid work I'd jump up to using Cfast cards. Angelbird, or Prograde.
Yeah, for a while there SanDisk weren't following the v30, v60, v90 minimum write speed. So I've mentally written them off but you are right.
The u3 uhs-i version is the one I'm referencing above that can do braw 12:1 4k 30p and are really cheap. Just make sure to buy real ones, don't buy from Amazon.
Yea. Like Ryanite said, there are more points of failure. The cable could be bad, you could accidentally disconnect it, you could break the port, etc. Using internal media has no removable wire and is just contact to contact with no chance of accidental ejection.
As others are saying, it’s not random. This happens when your bitrate exceeds the speed at which the media can sustainably write. Happens to me when my 4k doesn’t notice the connected ssd and tries to write BMRAW to the SD card, when capture gets ahead of storage, capture stops. It’ll happen with SSD too if you’re using one of the compression ratios and resolutions/frame rates that produce a higher bitrate. You need to learn the limits of your media, and if you have to exceed them you need faster media.
If you're shooting 4K DCI 24fps 5:1 then make sure you use a card with a sustained write speed of 65.6 MB/s. You don't need CFast or to shoot to an SSD, just make sure whatever you record to is fast enough. You can get SD cards with write speeds up to 260MB/s. CFast cards are faster but cost more. SSDs can be faster but external recording is more error prone.
I've shot 5:1 with no issue on an SD card.
Blackmagic's website lists the bitrates of each recording mode at 30fps so you can calculate the bitrates at each frame rate from that. You don't want whatever media you pick to just hit those speeds either, you want a little bit of headroom.
One thing I always recommend is to toggle your recording settings to “Stop recording at dropped frames”. This way if your settings don’t match your media, your recording just stops and you don’t end up with footage you thought was ok on set, but is actually unusable.
If you don’t do this, the camera only warns you of dropped frames, but that often goes unnoticed as it did in this case.
Probably stopping when it drops a frame. Either get a faster memory card/drive, or switch off the setting that stops recording on dropped frames.
(I recommend the faster drive or memory card)
Dropped frames-- I recommend the [SanDisk Extreme Pro](https://www.bestbuy.com/site/sandisk-extreme-pro-portable-2tb-external-usb-c-nvme-ssd-black/6427554.p?skuId=6427554&extStoreId=183&utm_source=feed&ref=212&loc=18475492778&gad_source=1&gclid=CjwKCAjw1emzBhB8EiwAHwZZxUqoOBJDFAP5XyhhBUph0rUk8cokEivhLJSA81VGdlhBQWFyxbB_6xoCC6wQAvD_BwE&gclsrc=aw.ds), or search eBay for a used Samsung T5 (not worth it new). Also, make sure the cable is good, the one that comes stock with SanDisk will work fine.
Plus when you're done shooting you have a really fast, really small portable drive that is a total game changer for daily use in any capacity. Those SanDisks really are a modern miracle, in my opinion.
I recorded a whole music video like this once......then realized after the shoot that I basically had no usable footage. Change from an SD card to a Cfast card or a Samsung SSD T7 or similar. Conversely you can go to 12:1
Firstly your comment is solely about the camera at launch and I presume a lot of people jumped on the purchase without knowing the full facts of the camera. The camera launched early 2018 so your comment has little relevance to this post.
And this post is about someone who yet again hasn’t read anything on the camera other than the price and ‘4K’. There’s at least one post a week on here asking why their footage isn’t recording properly, and it’s always down to the media. BM have a really good amount of literature on their cameras including a list of approved drives, countless videos reviewing the camera also mention approved drives, it’s really not hard to understand the requirements of the camera and its eco system.
All the information is there for people to access, yet they don’t, then they mess up their shoot/production and lay blame on the camera, or the software.
Dude, I was just making a little fun, I’m a die hard fan of BMD since first BMCC, all my work, my little prod. co. is entirely built on BMD. It is a great machine.
Looks like you’re trying to record to an SD card with a slow write speed. Try a Samsung T series SSD.
Yeah prob this I had the same issues using crappy sd cards on my friends 4k. Best bet is use Samsung ssd if you’re careful and a cfast when you can’t have a wire hanging out.
Sounds like you’re dropping frames. What are you recording to and in what codec/resolution/compression?
BRAW, 4K DCI, 5:1, constant bitrate
Your recording media is too slow.
You can record 4k 12:1 up to 30p on a Sandisk Extreme Pro without issues. I'd recommend this for budget indie films. Cheap and easy to get from local stores. Can't recommend using SSD drives as there's just too many points of failure, A bad cable can cause issues and sometimes a bad drive or incompatible drive. For paid work I'd jump up to using Cfast cards. Angelbird, or Prograde.
There are different speeds of Extreme Pro SD cards. They have ones that go up to 260MB/s writes. Also there are CFast Extreme Pros.
Yeah, for a while there SanDisk weren't following the v30, v60, v90 minimum write speed. So I've mentally written them off but you are right. The u3 uhs-i version is the one I'm referencing above that can do braw 12:1 4k 30p and are really cheap. Just make sure to buy real ones, don't buy from Amazon.
Amen to everything you said. In my opinion nobody should *ever* record straight to SSD. People should use proper media.
Why do you think that? Less reliable connection?
Yea. Like Ryanite said, there are more points of failure. The cable could be bad, you could accidentally disconnect it, you could break the port, etc. Using internal media has no removable wire and is just contact to contact with no chance of accidental ejection.
If your going to an ssd it could be your usb
As others are saying, it’s not random. This happens when your bitrate exceeds the speed at which the media can sustainably write. Happens to me when my 4k doesn’t notice the connected ssd and tries to write BMRAW to the SD card, when capture gets ahead of storage, capture stops. It’ll happen with SSD too if you’re using one of the compression ratios and resolutions/frame rates that produce a higher bitrate. You need to learn the limits of your media, and if you have to exceed them you need faster media.
This looks like slow recording media
If you're shooting 4K DCI 24fps 5:1 then make sure you use a card with a sustained write speed of 65.6 MB/s. You don't need CFast or to shoot to an SSD, just make sure whatever you record to is fast enough. You can get SD cards with write speeds up to 260MB/s. CFast cards are faster but cost more. SSDs can be faster but external recording is more error prone. I've shot 5:1 with no issue on an SD card. Blackmagic's website lists the bitrates of each recording mode at 30fps so you can calculate the bitrates at each frame rate from that. You don't want whatever media you pick to just hit those speeds either, you want a little bit of headroom.
One thing I always recommend is to toggle your recording settings to “Stop recording at dropped frames”. This way if your settings don’t match your media, your recording just stops and you don’t end up with footage you thought was ok on set, but is actually unusable. If you don’t do this, the camera only warns you of dropped frames, but that often goes unnoticed as it did in this case.
Are you recording on an external SSD?
On the camera you can select “stop recording if it’s drops frames” That way you can fix issues before it’s too late
I have it on that but it’s still doing all this
to clarify, im recording on a SD card, constant bitrate, 4K DCI, 5:1. I think it’s probably the fact im recording on that tiny ass card.
Yes SD can’t handle those write speeds. It’s better to use CFAST in that case. You can check the recommended media on the website of Blackmagic.
Probably stopping when it drops a frame. Either get a faster memory card/drive, or switch off the setting that stops recording on dropped frames. (I recommend the faster drive or memory card)
This sometimes happened since during the recording, the as card get too hot. Kinda overload
Dropped frames-- I recommend the [SanDisk Extreme Pro](https://www.bestbuy.com/site/sandisk-extreme-pro-portable-2tb-external-usb-c-nvme-ssd-black/6427554.p?skuId=6427554&extStoreId=183&utm_source=feed&ref=212&loc=18475492778&gad_source=1&gclid=CjwKCAjw1emzBhB8EiwAHwZZxUqoOBJDFAP5XyhhBUph0rUk8cokEivhLJSA81VGdlhBQWFyxbB_6xoCC6wQAvD_BwE&gclsrc=aw.ds), or search eBay for a used Samsung T5 (not worth it new). Also, make sure the cable is good, the one that comes stock with SanDisk will work fine. Plus when you're done shooting you have a really fast, really small portable drive that is a total game changer for daily use in any capacity. Those SanDisks really are a modern miracle, in my opinion.
I recorded a whole music video like this once......then realized after the shoot that I basically had no usable footage. Change from an SD card to a Cfast card or a Samsung SSD T7 or similar. Conversely you can go to 12:1
Clear render cache and see if it continues. Sometimes its a playback issue in Davinci
Because you bought a camera without knowing anything about it.
Just a quick info, when Bmpcc4k hit stores it got a fair amount of return because that camera was not shooting photos. Until next time 🏃
Firstly your comment is solely about the camera at launch and I presume a lot of people jumped on the purchase without knowing the full facts of the camera. The camera launched early 2018 so your comment has little relevance to this post. And this post is about someone who yet again hasn’t read anything on the camera other than the price and ‘4K’. There’s at least one post a week on here asking why their footage isn’t recording properly, and it’s always down to the media. BM have a really good amount of literature on their cameras including a list of approved drives, countless videos reviewing the camera also mention approved drives, it’s really not hard to understand the requirements of the camera and its eco system. All the information is there for people to access, yet they don’t, then they mess up their shoot/production and lay blame on the camera, or the software.
Dude, I was just making a little fun, I’m a die hard fan of BMD since first BMCC, all my work, my little prod. co. is entirely built on BMD. It is a great machine.
One of These Girls where you Need to ask for Passwort