Help! Playback Lagging on Multi-cam

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sabbir_ing

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Help! Playback Lagging on Multi-cam

PostMon Aug 08, 2022 4:44 pm

Hello everybody,
I have faced an common problem called playback lagging issue.
Playback is so much smoother on single viewer mode but when I turned on multicam, it's playback being too much slower.
If I choose 2x2 camera on multi-cam window, it's almost good enough playback but it can't play on 4X4.
How can I solve this issue?
I have to check each clip for editing.

See the number of playback frame is red on 4x4 default view.
playback issue 1.jpg
Lagging Playback
playback issue 1.jpg (350.21 KiB) Viewed 2336 times


This is good if I select 2x2 but I need to see all clips at a time.
playback issue 2.jpg
Smooth Playback
playback issue 2.jpg (331.66 KiB) Viewed 2336 times


Here is my pc config:
pc config.jpg
pc config.jpg (139.9 KiB) Viewed 2336 times


Thank you.
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Jim Simon

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Re: Help! Playback Lagging on Multi-cam

PostTue Aug 09, 2022 2:12 pm

I can't see what your source media is. You might try transcoding to Cineform or DNxHR.

Could also be your drive just can't keep up with that may streams.
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waltervolpatto

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Re: Help! Playback Lagging on Multi-cam

PostTue Aug 09, 2022 2:53 pm

do you have enough bandwidth to play form teh drives? hows the CPU/GPu load when you dont have playback?
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Jimmykarlsen

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Re: Help! Playback Lagging on Multi-cam

PostTue Aug 09, 2022 6:14 pm

All the times I have had problem with multicam lagging is because of disk speed or transfer speed from the storage itself is to slow.

Cheers Jimmy

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bgks@bmd

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Re: Help! Playback Lagging on Multi-cam

PostTue Aug 09, 2022 8:34 pm

waltervolpatto wrote:hows the CPU/GPu load when you dont have playback?


Valid question. However if you select «DaVinci Resolve -> Preferences.User -> UI Settings [x] Stop playback when a dropped frame is detected», that is announced as warning against performance issues, you'd find stops while CPU/GPU/Disk-load is way apart from limits.
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Joe Shapiro

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Re: Help! Playback Lagging on Multi-cam

PostTue Aug 09, 2022 8:55 pm

Walter also suggested checking to see if there’s enough disk throughput. Does sound like a good idea since we’re talking about multiple streams of video.


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panos_mts

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Re: Help! Playback Lagging on Multi-cam

PostTue Aug 09, 2022 9:06 pm

When I edit music videos with 15-20 angles, the only way to get smooth playback is to create proxies.
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sabbir_ing

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 11, 2022 7:28 am

waltervolpatto wrote:do you have enough bandwidth to play form teh drives? hows the CPU/GPu load when you dont have playback?

Where I will see my GPU loading?
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sabbir_ing

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 11, 2022 7:29 am

Jim Simon wrote:I can't see what your source media is. You might try transcoding to Cineform or DNxHR.

Could also be your drive just can't keep up with that may streams.

My source media is raw footage. It can play smoothly when I put maximum 3x3 on multicam. Is there any way to reduce playback resolution on multicam window also?
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sabbir_ing

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 11, 2022 7:30 am

Jimmykarlsen wrote:All the times I have had problem with multicam lagging is because of disk speed or transfer speed from the storage itself is to slow.

Cheers Jimmy

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Did you tried from internal SSD with multicam project?
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sabbir_ing

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 11, 2022 7:31 am

Joe Shapiro wrote:Walter also suggested checking to see if there’s enough disk throughput. Does sound like a good idea since we’re talking about multiple streams of video.


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I have enough disk space where caches are stored.
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sabbir_ing

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 11, 2022 7:35 am

panos_mts wrote:When I edit music videos with 15-20 angles, the only way to get smooth playback is to create proxies.


Okey then maybe it's best solution. BTW I would like to ask an another thinks.
I can export my video .mp4 from my mac with audio codec AAC & depth with 24 but in my windows there is no options for AAC with 24 bit.
Can you tell me?
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Jim Simon

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Re: Help! Playback Lagging on Multi-cam

PostFri Aug 12, 2022 3:42 pm

sabbir_ing wrote: Is there any way to reduce playback resolution
Maybe try this:

RAW Decode.png
RAW Decode.png (21.34 KiB) Viewed 2091 times
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Joe Shapiro

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Re: Help! Playback Lagging on Multi-cam

PostFri Aug 12, 2022 5:01 pm

sabbir_ing wrote:
Joe Shapiro wrote:Walter also suggested checking to see if there’s enough disk throughput. Does sound like a good idea since we’re talking about multiple streams of video.


I have enough disk space where caches are stored.


It's not the space but rather the speed of the disks I'm suggesting as the problem.
If you have 2x2 playing smoothly then your disks can apparently handle that.
But 4x4 requires 4x more disk speed (throughput or bandwidth) than 2x2.

You can use, say, Black Magic Disk Speed Test to check the speed of your drives.
Here's what it looks like for my system disk on my 16" MBP M1:
bmd-disk-speed-test-mbp16-m1.jpg
bmd-disk-speed-test-mbp16-m1.jpg (460.35 KiB) Viewed 2075 times


As far as AAC goes, are you asking this because you want to make proxies, or for the eventual export? If it's for proxies, you shouldn't need to worry about sound bit depth because you'll make your final video from the original sources.
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Uli Plank

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Re: Help! Playback Lagging on Multi-cam

PostSat Aug 13, 2022 6:36 am

Reducing decode resolution may help if it’s not because of storage throughput, but computing power.
Some formats, like RedRAW from older cameras using wavelet profit more than cameras using DCT.
If that doesn’t help, it’s proxies.
No, an iGPU is not enough, and you can't use HEVC 10 bit 4:2:2 in the free version.

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Jim Simon

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Re: Help! Playback Lagging on Multi-cam

PostSat Aug 13, 2022 2:42 pm

Uli Plank wrote:Reducing decode resolution may help if it’s not because of storage throughput, but computing power.
Good point.
My Biases:

You NEED training.
You NEED a desktop.
You NEED a calibrated (non-computer) display.
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sabbir_ing

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 18, 2022 5:38 pm

Thanks for suggesting. I didn't tried with proxies. My source footage on external hdd. I hope it makes slower.
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Uli Plank

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Re: Help! Playback Lagging on Multi-cam

PostThu Aug 18, 2022 5:48 pm

HDDs are not only critical regarding throughput, but access times are very demanding for multi-cam.
No, an iGPU is not enough, and you can't use HEVC 10 bit 4:2:2 in the free version.

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