Bitrate drops while recording only on specific SSD-drive

M

Mukimuk

New Member
Hi folks!

I've already read some threads about my problem, unfortunately there was no solution for me.
Let me discribe my situation: normally all my recordings are saved on a 1TB SSD (~ 540MB/s writing speed), I had no problem with that for the last few years.
I wanted to upgrade now to a better 2TB SSD (~ 1050 MB/s writing speed) but the recordings aren't quite working as they should.

I record in lossless quality, no other settings, just Output > Recording > lossless quality 1920x1080p. I know it's not necessary I could use x264 or NVIDIA NVENC and there are many more settings I could adjust. But for now I just want to fix the problem I have with the lossless settings I have.

With me new 2TB SSD 15-20 minutes into recording I can see in the statistics tab the bitrate is dropping. Normally it is around 600.000 kb/s (590.000 -610.000) but after 15-20 minutes it drops to 100.000, goes up to 900.000 drops to 300.000 and goes up again and drops and so on. If i click "stop recording" it doesn't stop immediately it takes a few seconds, sometimes even a minute to stop the recording. When I watch the recorded clip afterwards the end part is missing, for example a 30 minute recording results in only a 20 minute clip.

With the old 1TB SSD im using for years now I do not experience the problem. I can record 30 minutes, click "stop recording", the recording stops immediately and the 30 minute recording is 30 minutes long, no loss whatsoever.

I have tried formating my new SSD to exFAT or NTFS, nothing changed. I tried different settings (only with a high bitrate: > 400.000 kb/s) - nothing changed.

As I said, I know I could change my settings, but the bigger question I have is: when I record the exact same thing with same settings on the different SSDs, why does a 30 minute recording results in a 30 minute clip on the old 1TB SSD and a 20 minute clip on the new, better 2 TB SSD?

I attached a log file (first one -13.txt) of two test recordings, as soon as the bitrate drops starts I stopped the recording and the "stop recording" button takes a few seconds to stop it. When i watch the clip the end is missing.

The other log (second -08.txt) is the file with my normal SSD and normal recordings. 40 minute recording = 40 minute clip.

Edit: I always thought almost all HDDs or SSDs are suitable for recording: the 1TB SSD is a Seagate Fast SSD, the 2TB is a samsung T7.
 

Attachments

  • 2022-09-15 16-48-13.txt
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  • 2022-09-15 18-07-08.txt
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R

rockbottom

Active Member
External, did you enable write caching?

You also have audio issues from Desktop Audio. Max buffering reached in both logs...

1663263614405.png
 
M

Mukimuk

New Member
I have activated "better performance" on my T7 now, but on the 1 TB SSD where everything works fine, it is not enabled. But I will test it anyway. Don't know what the audio lag caused, but this problem is gone now, done two test recordings audio lag is gone.

Give me half an hour for the test.
 
M

Mukimuk

New Member
Tested it now but didn't work, after 12 minutes into recording bitrate dropped, I stopped recording after 13 minutes result was a 10 minute clip so 3 minute loss.
 
sandrix

sandrix

Member
From what I can advise is to record using NVENC H.264 with a different bit rate control. You can use CBR bitrate 50,000 kbps or CQP 14 mode. I use the first option. I usually only use lossless recording for desktop recording. Your bitrate will vary greatly anyway. lossless recording uses CQP=0. That is, the amount of bitrate is allocated depending on the complexity of the video fragment.

For an SSD drive, I can recommend using the Victoria HDD / SSD program to check it for errors. In my practice, there was a case when a practically new, very expensive SSD turned out to be with a ton of errors. The customer simply replaced it at the store.
 
M

Mukimuk

New Member
sandrix said:
From what I can advise is to record using NVENC H.264 with a different bit rate control. You can use CBR bitrate 50,000 kbps or CQP 14 mode. I use the first option. I usually only use lossless recording for desktop recording. Your bitrate will vary greatly anyway. lossless recording uses CQP=0. That is, the amount of bitrate is allocated depending on the complexity of the video fragment.

For an SSD drive, I can recommend using the Victoria HDD / SSD program to check it for errors. In my practice, there was a case when a practically new, very expensive SSD turned out to be with a ton of errors. The customer simply replaced it at the store.
Click to expand...
As I said I know I can change my settings, maybe in the future I will. But for now I am just curious to know why an old SSD is able to record without any errors, but a brand new SSD with double the speed cant record a 30 minute video.
 
R

rockbottom

Active Member
DRAMless SSD's are designed for light workloads, not what you're attempting to do. It may continue giving you trouble even with cache writing enabled.
 
sandrix

sandrix

Member
I also noticed that you are using a portable Samsung T7 SSD, which is connected via USB, as I understand it. Pay attention to how the connection is made. I suspect that the problem is in the connection interface.
 
M

Mukimuk

New Member
sandrix said:
I also noticed that you are using a portable Samsung T7 SSD, which is connected via USB, as I understand it. Pay attention to how the connection is made. The problem may be if the connection is made via USB 2.0, which has a speed of up to 480 Mbps. It won't work. I suspect that the problem is in the connection interface.
Click to expand...
Connection was first via the same USB 3.0 cable as the normal 1TB SSD, afterwards I tested it with USB-C to USB-C but both ways same result: 30 minute recording 20 minute clip :/

I didn't know that it is that difficult to find the right SSD for recordings. As I said I am using the 1TB SSD for years now never had a problem, thought what if it dies someday, I need a replacement, and now the "replacement" is even worse than the old 1TB one ...
 
M

Mukimuk

New Member
rockbottom said:
It's DRAMless & actually really bad at sustained write workloads.

View attachment 86681
Click to expand...
Ok wow this graphic is really what I needed to see, thank you! Toms Hardware is absolutely right: once the file is about 80-90 GB, the bitrate drop starts, just as in the picture. Luckily I've not thrown away the paper and package yet, so I can send it back tomorrow. Thanks again for the help.
 
R

rockbottom

Active Member
YW!!

Cool, return should be painless.

That WD P40 is brand new, not any reviews yet but I suspect it has the same drive as the P50 but with only a 10G interface.
 
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