Throttle Transcode doesnt work

[RandomDelta6]

Describe the bug
Throttle transcode isn't working. Transcoding stops only after the entire media has been transcoded. [Orange bar way ahead of blue].Throttle transcode box is checked and am using quicksync acceleration.

System (please complete the following information):

• OS: Windows 10
• Virtualization:no
• Clients: android 9
• Browser: [e.g. Firefox 72, Chrome 80, Safari 13]
• Jellyfin Version: 10.5.4 stable
• Playback:Transcode
• Installed Plugins:none
• Reverse Proxy: none
• Base URL:none
• Networking: none
• Storage: local

To Reproduce
playback any hevc video on web browser like chrome

Expected behavior
transcode should stop after a little while,instead it is continuing putting unwanted strain on system

Logs
n/a

Screenshots

[Artiume]

The throttler is only with Software Transcoding, not Hardware Transcoding.

[RandomDelta6]

it used to work fine in version 10.4.
so. I think throttle transcode throttles it whether harware acceleration is on or not

[Artiume]

It didn't exist in 10.4. Please see #2258 and it is specifically disabled for HWA.

[RandomDelta6]

ok. Thanks.
Maybe consider enabling throttle transcode for hwa playback?

[Artiume]

It was disabled because it caused abnormal behavior. The throttler now is a hack and needs to be reworked. It will probably stay the way it is for a while, it is not a high priority feature.

[RandomDelta6]

ok. Thanks!

[RandomDelta6]

Since you mentioned it caused it caused abnormal behaviour, I think the code to enable it for hwa exists. Can you tell how to enable it.
Also, how about giving a new checkbox for hwa throttle transcodes and marking it as experimental?

[Artiume]

To enable it for HWA, you'll need to build Jellyfin yourself.

jellyfin/MediaBrowser.Api/Playback/BaseStreamingService.cs

Line 324 in 16401ec

if (encodingOptions.HardwareAccelerationType == string.Empty)

In this section, remove the If statement so it will always return true.

[stale]

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If you're the original submitter of this issue, please comment confirming if this issue still affects you in the latest release or nightlies, or close the issue if it has been fixed. If you're another user also affected by this bug, please comment confirming so. Either action will remove the stale label.
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[bingzhangdai]

The throttler now is a hack and needs to be reworked. It will probably stay the way it is for a while, it is not a high priority feature.

From my understanding, this feature will not be available for a long period of time?

[stale]

This issue has gone 120 days without comment. To avoid abandoned issues, it will be closed in 21 days if there are no new comments.
If you're the original submitter of this issue, please comment confirming if this issue still affects you in the latest release or nightlies, or close the issue if it has been fixed. If you're another user also affected by this bug, please comment confirming so. Either action will remove the stale label.
This bot exists to prevent issues from becoming stale and forgotten. Jellyfin is always moving forward, and bugs are often fixed as side effects of other changes. We therefore ask that bug report authors remain vigilant about their issues to ensure they are closed if fixed, or re-confirmed - perhaps with fresh logs or reproduction examples - regularly. If you have any questions you can reach us on Matrix or Social Media.

[RandomDelta6]

just commenting to remove the stale label. Throttle transcode still does not work with Gpu acceleration.
Would be great if it could be added as an experimental toggle

[bingzhangdai]

just comment to keep this issue open

[stale]

This issue has gone 120 days without comment. To avoid abandoned issues, it will be closed in 21 days if there are no new comments.
If you're the original submitter of this issue, please comment confirming if this issue still affects you in the latest release or nightlies, or close the issue if it has been fixed. If you're another user also affected by this bug, please comment confirming so. Either action will remove the stale label.
This bot exists to prevent issues from becoming stale and forgotten. Jellyfin is always moving forward, and bugs are often fixed as side effects of other changes. We therefore ask that bug report authors remain vigilant about their issues to ensure they are closed if fixed, or re-confirmed - perhaps with fresh logs or reproduction examples - regularly. If you have any questions you can reach us on Matrix or Social Media.

[bingzhangdai]

just comment to keep this issue open

[tinect]

Sadly, this feature still doesn't work at all :-(

[ragingsonar]

I really hope this issue is addressed. I can't have jellyfin writing 20gb+ files when the user only watches 10 minutes of a 2 hour video

[RandomDelta6]

I agree. It uselessly puts strain on the system and especially wears down the ssd. It's a huge waste in terms of power and drive life, IK it works with Software Transcoding but I require HW transcoding as my system won't be able to handle the streams I require otherwise.

[ragingsonar]

I agree. It uselessly puts strain on the system and especially wears down the ssd. It's a huge waste in terms of power and drive life, IK it works with Software Transcoding but I require HW transcoding as my system won't be able to handle the streams I require otherwise.

I'm pretty sure software transcoding limit is broken now too

[cvium]

It's unfortunately a very broken feature (and ill conceived). To have proper support we'd need to make changes to ffmpeg itself.

[ragingsonar]

It's unfortunately a very broken feature (and ill conceived). To have proper support we'd need to make changes to ffmpeg itself.

I haven't any experience with this sort of program, so I apologise if this is naive or stupid, but could some sort of cpu limiting solution like https://github.com/opsengine/cpulimit work for when jellyfin launches ffmpeg? As in to implement some sort of non-ideal workaround which limits usage without modifying the programs source?

[Artiume]

It would have to be a cross platform solution, ideally from within ffmpeg itself. adding additional processes isn't the best manner for long-term solutions.

[vgarleanu]

It would have to be a cross platform solution, ideally from within ffmpeg itself. adding additional processes isn't the best manner for long-term solutions.

cpulimit works by using SIGSTOP and SIGCONT to pause and unpause a process. These two signals are available on all unix platforms. As for Windows there are the NtSuspendProcess and NtResumeProcess APIs which have the same effect.

Im sure throttling could be implemented with this.

[barolo]

This needs to be adressed. I keep transcode cache in 8GB of RAM, gets fillled up on occasion and has to be purged manually. Otherwise nothing that needs remuxing or transcoding will play.

[cvium]

Need is a strong word. It's nice to have, but without proper ffmpeg throttle support it's just not feasible.

[shaino]

Recent ffmpeg development updates quickly. Unfortunately, the 'Throttle Transcodes' option is not highly prioritized.
Eager to start as soon as possible.

[felix920506]

I have just tested this on my Jellyfin instance (10.8.11, jellyfin-ffmpeg6)
This feature is working so it is likely it was fixed but not closed.

ffmpeg logs:
throddle.txt

[Shadowghost]

The fix was backported.