About Apple ProRes (QuickTime)
Apple introduced ProRes in 2007 as the codec professional video would be edited in, and it stuck: nearly two decades later it is the default currency of postproduction. Its trick is intra-frame compression — every frame is stored complete, none is derived from its neighbors — which makes scrubbing a timeline instant and re-exporting generation after generation essentially painless. The price is size: ProRes spends hundreds of megabits per second, from the leaner 422 Proxy and LT proxies through 422 and 422 HQ up to 4444 and 4444 XQ, which add an alpha channel for motion graphics.
That design makes ProRes superb inside an edit suite and stubborn everywhere else. Browsers, phones, TVs, and upload forms have no idea what to do with it — it was never meant for delivery, so playback support outside professional software is close to nonexistent. Everyone who works with ProRes eventually needs the same thing: a watchable copy in a normal format.
Convertmaxxing decodes ProRes with a decoder built into the page — no editing software or plugin needed — and converts it to MP4 for delivery. ProRes always re-encodes (delivery players expect codecs like H.264, so there is no lossless repackaging shortcut), and ProRes RAW, being unprocessed sensor data rather than encoded video, is not supported. Creating ProRes files isn’t supported either; converting away from ProRes is the real-world need.
Strengths
- Every frame stands alone, so timeline scrubbing and cutting are instant in any editor
- Visually lossless 10-bit (and 12-bit in 4444) quality that survives repeated edit-and-export cycles
- The postproduction standard — every professional editing and grading tool accepts it
- The 4444 variants carry an alpha channel, making it a workhorse for motion graphics
Limitations
- Enormous files — minutes of footage can consume gigabytes of disk
- Virtually unplayable outside professional software: browsers, phones, and TVs refuse it
- A working format, not a delivery format — sharing ProRes always means converting first
- Creating ProRes isn’t supported here, and ProRes RAW capture files can’t be read