progress slider stutter

[sclsj]

System and IINA version:

• macOS 12.3.1
• IINA 1.2.0

Expected behavior:

When dragging the progress slider, there is no delay and the animation is smooth.

Actual behavior:

When dragging the progress slider, there is a ~1 second delay. And the sliding action is not smooth. [seems to only occur on a specific album: sungazer's perihelion downloaded from Netease Music.]

Steps to reproduce:

Open an audio file from the album and drag the progress slider.

• MPV also seem to have this problem. It's smoother but still not as smooth as some random mp3s I have laying around.

How often does this happen?

Always.

[CarterLi]

seems to only occur on a specific album: sungazer's perihelion downloaded from Netease Music

Often because it's not correctly encoded. You may convert the audio format to something else and try to reproduce

[sclsj]

Same thing also happens when I re-encode it to alac. Example: ffmpeg -i /Users/jin/Music/网易云音乐/Sungazer/Perihelion/Sungazer\ -\ Threshold.flac -c:v copy -c:a alac /Users/jin/Music/网易云音乐/Sungazer/Perihelion/Sungazer\ -\ Threshold2.m4a

[sclsj]

I removed the cover art with -vn and it fixed the stuttering.