new mp4 rendering is extremely slow

[kurzemnieks]

New MP4 rendering is extremely slow compared to legacy MP4 rendering.
When choosing new MP4 - for first few seconds it records fast, and then framerate drops to less than 1fps (even on 720p).
While legacy mp4 renders at constant 7-8fps @4k.

ps: Can you also add bitrate settings to new MP4 rendering?

[kurzemnieks]

Is Recorder still being worked on? No activity for quite a while :(

[TheChrisED]

I experienced this issue as well. I'm recording 360° videos with Unity 2018.1.0b4.
At first it records at about 5fps and then drops to below 1.
Looking at the Task Manager I noticed that at the beginning of the recording 10% CPU and 80% GPU power are used. When the recording drops to 1fps CPU usage drops to 1% and GPU usage drops to 25%.

System:
Unity 2018.1.0b4
Recorder 0.2.0032
Windows 10.0.16299
Intel Core i7 4930K @3.4GHz
NVIDIA GeForce GTX 1070 8GB VRAM

[caseypugh]

+1 - I just found this issue but seems like the same thing I am encountering #67

@kurzemnieks are you on Windows?

[TheChrisED]

I just ran into an unrelated problem with the project I'm recording in and went to a backup.
Recording in the backed up version of the project worked with 5fps all the way through. I recorded a 2 minute video without seeing a drop. So far I couldn't find a reason why, though.

[kurzemnieks]

@caseypugh yes, I'm on Windows 10

[dustinkerstein]

Same issue here on the latest asset store release and Unity 2018.1.0b8 on Windows 10.

[Tbernard33]

Same issue here. When my framerate drop at 1 it messes up with my grass. I got trees and grass animated by a wind effect and while recording, the both have different speed... I also have particles wich are not affected.

Any thoughts ? I thought it was related to that framerate, but I may be wrong.

[marijneken]

I noticed the same thing just last week. I also discovered that it's related to having the audio recording disabled. Once I enabled audio recording, the speed stayed constant throughout the whole recording. But not having a bitrate setting, made me revert to using the old MP4 recorder anyway.

[Arakade]

Interesting about the audio thing, maybe that's why my attempt to use the new AsyncGPUReadback API suffered problems:

https://forum.unity.com/threads/unity-recorder-update.509458/page-3#post-3512712
https://forum.unity.com/threads/unity-recorder-update.509458/page-3#post-3512869
https://forum.unity.com/threads/unity-recorder-update.509458/page-3#post-3512893
https://forum.unity.com/threads/unity-recorder-update.509458/page-3#post-3513013

Summary: Deep profiling says MediaEncoder is becoming slower and slower. (With or without AsyncGPUReadback after 72 frames, FPS drops and gets worse with 0.25 FPS after 130 frames.)

[jakubsmaga]

https://forum.unity.com/threads/video-recorder-in-the-editor.482014/#post-3520120