frameshift / MP4 LAB
LOCAL PROCESSING · NO UPLOADS
Container remux utility / 01

Same picture.
Different wrapper.

Choose your resolution and bitrate. Encode your video to MP4, then apply the extra AAC track method. Your files stay in this browser; nothing is sent to a server.

Prepare an output

MP4, MOV, MKV, AVI, WebM and more. Portrait and landscape orientation are preserved.
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Drop your video hereor click to browse · processing happens on this device

Container report

READY
CHECKRESULTDETAIL
Download output
The media check compares the newly encoded MP4 payload with the final output media-data box. This confirms bitstream preservation; it does not guarantee every player accepts unusual metadata.