[Peter Robertson] “I have a complex multicam project using original camera codecs.
I have all my media on SSD’s with enough free space and have a new iMac. The edit went ok but the delivery to H.264 Master stops after about 20 minutes of content.”
Cheap workaround: render to a mezzanine format like ProRes 422 or 422HQ, then take the completed 422 file and render that to H.264 in a separate session. See if that works.
Worst case: use a 3rd-party free app like Handbreak to convert the ProRes to H.264, or a paid app like Adobe Media Encoder.
I have been successful rendering out H.264 from Resolve 16, but it is slow and I generally have to drop the render speed. But I have not tried it with a super-long project like a 2-hour feature or something. Generally when I post client previews to Frame.io, I use ProRes LT and let the website do its own compression thing. If the client wants the original LT file, they can download that, too.