The VideoLAN Forums

Posted: **21 May 2024 16:46**

Hello, I'm trying to convert some MP4 (MPEG-4 + AAC) files to WebM with no success.

I was using VLC 3.0.17 for Win64, and created a new profile for VP8 + Opus. But the video quality was awful. no matter how high the bitrate I set.

So I installed VLC 3.0.20 for Win64, and re-created a new profile for VP8 + Opus. Now I get a 0-byte file every time I try...

Actually I was supposed to use VP9 rather than VP8, but the profile edit menu doesn't show it. I thought VLC supported it?

Posted: **22 May 2024 13:15**

Please open Tools -> Messages (set Verbosity to 2) before you start the conversion, keep the messages window open and then paste the full resulting log here or on Pastebin.com or on Justpaste.it if it's too long.

Posted: **22 May 2024 15:02**

Done, I got this error:

Code: Select all

avcodec error: cannot find encoder Google/On2's VP8 Video *** Your Libav/FFmpeg installation is crippled. *** *** Please check with your Libav/FFmpeg packager. *** *** This is NOT a VLC media player issue. ***

VLC never showed any error modal windows. So what's next?

Posted: **23 May 2024 12:41**

Conversion to WEBM using the default profile with VP8 + Opus worked fine for me.
You should reinstall VLC.

If it doesn't help then reset the preferences and cache (the manual way) and try again:
https://wiki.videolan.org/VSG:ResetPrefs

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Issues converting from MP4 to WebM

Issues converting from MP4 to WebM

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Re: Issues converting from MP4 to WebM

Re: Issues converting from MP4 to WebM