Step 2 — Build FFmpeg for aarch64 with NEON Option A — Cross-compile on x86_64 host (recommended)
A very specific topic!
| Issue | Likely Cause | Solution | | :--- | :--- | :--- | | "Invalid custom codec" error | Version mismatch (e.g., codec v1.49 on MX Player v1.50) | Revert MX Player to v1.49.0 or find a v1.50 repack | | Video plays, audio is robotic/static | NEON optimization mismatch | Try the "ARMv7 NEON" repack (some devices misreport architecture) | | Codec loads but AC3 still silent | Regional block in the repack | Search for a different repack variant (e.g., "All codecs unlocked") | | App crashes when opening settings | Corrupt download | Re-download the .zip file; clear MX Player app cache | | No sound after seeking in video | HW decoder buffer issue | Switch to SW decoder temporarily, then back to HW+ | mx player custom codec 149 0 armv8 neon repack