Video lagging a lot

Question

Video lagging a lot

Opened this issue a year ago · 10 comments

No errors in output, audio plays fine, but the video is lagging a lot, only some frames are playing...
Do you guys have some suggestions to fix this issue?

Answer 1 · 2023-11-09T01:27:07.000Z

Make sure you're using h264 codec since the encoder for that uses a lot less cpu than vp8. If your computer/vps still struggles with that you can decrease the bitrate and/or resolution

Answer 2 · 2023-11-09T04:46:25.000Z

Thanks for the help, but apparently I don't believe it's a cpu problem, since ffmpeg isn't consuming even 10% of it looking through the task manager. I'll try hosting on a VPS and see if this problem is fixed, as soon as I have an answer I'll let you know.

Answer 3 · 2023-11-09T05:11:56.000Z

I just tested with a VPS, and it seems to work fine (almost), i just needed to set the stream FPS to 15, but that's not a problem for me. For better results maybe I need a better CPU?

Answer 4 · 2023-11-09T21:46:58.000Z

If it wasn't using too much cpu but the resulting video was still slow it could be your internet speed. Try lowering the bitrate and resolution

Answer 5 · 2024-02-09T02:28:33.000Z

Can you test the current version of the package? I've optimized various parts in the code, and it should be purely IO bound now.

Answer 6 · 2024-09-27T18:33:27.000Z

Same thing. Even with 240p 15fps
https://github.com/user-attachments/assets/f95dc66d-5123-4bb8-8176-6252e9763b7c

Answer 7 · 2024-09-27T23:41:59.000Z

I've added buffer and performance/quality is fine now.
I deleted

-fflags nobuffer
-analyzeduration 0

and added

-bufsize 6000k

But audio still ahead of the video. And I have no idea how to fix that

Answer 8 · 2024-09-28T01:29:17.000Z

What kind of video input is it? A regular video file or a m3u8 livestream? I know that there's an issue with certain m3u8 streams where the audio is out of sync with the video and the only solution I found was to remove the '-re' flag. There's an open issue about it

Answer 9 · 2024-09-28T01:37:30.000Z

I'm using this interface https://github.com/ysdragon/StreamBot

It doesn't support readAtNativeFps option afaik
Is '-re' enabled by default?

I've tested local file and youtube video (it still loads locally)

Also this ysdragon/StreamBot#37 (comment)

Answer 10 · 2024-09-28T01:45:39.000Z

At some point it was the default, until I removed it and added it as an option instead since it did not affect all video files