- Posts: 85
- Joined: Sat Aug 03, 2019 11:00 pm
- Location: Sydney, Australia
- Real Name: John Wheeler
I've been experimenting with some BMPCC 4K footage on an M1 Mac mini, and while I'm generally happy with performance, I do notice some stuttering playing with 60fps BRAW @8:1 compression.
I initially though I had a timeline conformance issue using HFR with 23.976 / 60 (rather than 24/60 or 23.976/59.94), so did some tests with a 60fps project. Playback in the camera seems to be fine, but has a few "stutters" in Resolve. Curiously, the playback fps counter shows 60 and remains green when this happens, although it does often have a brief "hicough" right at the beginning of playback where I see the frame rate drop to 57 - 58 for an instant.
I also wondered whether optical image stabilisation in my lens my be interfering (I did a panning test on a tripod of some passing cars), but I can see the same effect, even when handheld and doing a fast pan.
Have I just reached the limit of the M1 Mac? CPU and GPU usage seem to be moderate so it's a bit surprising.
I'm using a 1080p timeline, and also experimented with optimized media (ProRes 422 HQ) and proxies (ProRes Proxy). The proxy is better, but still not perfectly smooth.
I also copied the clip from the external Samsung T7 I use for editing (connected via a TB3 dock which improves speeds) to the internal SSD. Again this was a bit better, but it was disappointing that an external SSD that should read at least 750MB/s has troubles playing back a BRAW 8:1 clip that is reported to have a bit-rate of 774Mb/s - note the difference between mega-bytes and bits. The SSD should have (in theory) plenty of bandwidth to play back the stream.
The M1 only has the free version of Resolve, but I have the Studio edition on a MacBook Pro 16 (8-core with AMD 5500M GPU) and a Windows Xeon E5-1650 workstation with a GTX1060 GPU). Both of these also show some issues with playback.
I should stress that these does not impact the ability to edit the footage. It's just very minor timing glitches that results in less than buttery-smooth playback.
I'm actually curious whether it's nothing to do with the computers, and some other issue. If proxies, optimised media and fast SSDs don't completely resolve the issue, perhaps something else is going on?
Any suggestions? Thanks!
I initially though I had a timeline conformance issue using HFR with 23.976 / 60 (rather than 24/60 or 23.976/59.94), so did some tests with a 60fps project. Playback in the camera seems to be fine, but has a few "stutters" in Resolve. Curiously, the playback fps counter shows 60 and remains green when this happens, although it does often have a brief "hicough" right at the beginning of playback where I see the frame rate drop to 57 - 58 for an instant.
I also wondered whether optical image stabilisation in my lens my be interfering (I did a panning test on a tripod of some passing cars), but I can see the same effect, even when handheld and doing a fast pan.
Have I just reached the limit of the M1 Mac? CPU and GPU usage seem to be moderate so it's a bit surprising.
I'm using a 1080p timeline, and also experimented with optimized media (ProRes 422 HQ) and proxies (ProRes Proxy). The proxy is better, but still not perfectly smooth.
I also copied the clip from the external Samsung T7 I use for editing (connected via a TB3 dock which improves speeds) to the internal SSD. Again this was a bit better, but it was disappointing that an external SSD that should read at least 750MB/s has troubles playing back a BRAW 8:1 clip that is reported to have a bit-rate of 774Mb/s - note the difference between mega-bytes and bits. The SSD should have (in theory) plenty of bandwidth to play back the stream.
The M1 only has the free version of Resolve, but I have the Studio edition on a MacBook Pro 16 (8-core with AMD 5500M GPU) and a Windows Xeon E5-1650 workstation with a GTX1060 GPU). Both of these also show some issues with playback.
I should stress that these does not impact the ability to edit the footage. It's just very minor timing glitches that results in less than buttery-smooth playback.
I'm actually curious whether it's nothing to do with the computers, and some other issue. If proxies, optimised media and fast SSDs don't completely resolve the issue, perhaps something else is going on?
Any suggestions? Thanks!