✳ CODEC COMPATIBILITY
X (Twitter) H.264 / AVC in MOV (QuickTime)
x accepts H.264 / AVC in MOV (QuickTime); not the default but a documented supported option.
Medium quality risk · X Media Studio lists MOV with H.264 + AAC.
default export from iPhone / Final Cut Pro. Studio spec; other surfaces not in scope.
ISO/IEC 14496-12 (ISO Base Media File Format) (verified 2026-09-18) · X Media Studio Library (verified 2026-09-18)
Frequently asked
Does X (Twitter) support H.264 / AVC in MOV (QuickTime)?
x accepts H.264 / AVC in MOV (QuickTime); not the default but a documented supported option. Koldflux's compatibility engine reaches this verdict from sourced platform documentation.
Should I convert H.264 / AVC in MOV (QuickTime) for X (Twitter)?
No conversion is required: this combination is already within X (Twitter)'s accepted profile.
Will X (Twitter) re-encode my file?
X Media Studio lists MOV with H.264 + AAC.