hevc on windows, prores export

more clips open, and more renders finish.

hevc on windows

chrome and edge on windows can't decode hevc, the format iphones record in, without microsoft's hevc video extensions. those clips used to stop at "can't open". now luttie decodes them itself:

• –the clip opens with the pick the frame to grade slider, the way prores does.
• –preview and export render it as video, more slowly than a browser's own decoder.
• –a 10-bit hdr iphone clip comes out in standard range, so its highlights look flatter than in photos.

prores as video

prores clips already opened in chrome and edge as a still. now preview and export render the graded clip as video there too.

renders that used to fail

• –on a phone, a render that fails tries again: from a copy of the file, at a smaller size, or with the sound copied or left out.
• –a clip the browser plays but can't decode for export (safari on a mac, firefox with hevc) renders by playing it through, in real time.
• –where something still can't work, luttie says so, and you can tell us you'd use it.