The custom codec is no longer officially hosted on MX Player’s website for newer versions. For v149.0, you would typically find it on XDA Developers forums or the developer's GitHub.
Cause: You downloaded the file from a mirror that injected ads into the .zip, or the download was incomplete. Fix: Re-download the file directly from the official XDA thread. Compare the file size (it should be roughly 1.5MB to 2MB). A 0KB or 50KB file is broken. mx player custom codec 149 0 armv8 neon
You might be tempted to download the newest codec from a random forum, or a generic "All-in-one" pack. Don't. The custom codec is no longer officially hosted
Here is why the specific match matters:
If you see a message that says "This custom codec does not match the version of MX Player installed" , do not proceed. If you see a message that says "This