Here’s my clip of Vader’s Castle with dimmed lights
http://www.mediafire.com/file/yqc05kidwmuzfkk/Fortress.aviSo I grabbed this file on my mac and used the Scoop! app (formerly iMediaHUD) to get the file info. It’s a windows BMP video file, and it’s 8bit uncompressed with Alpha channel. The bitrate is a whopping 1.5 Gbps. That’s why it won’t play smooth on VLC, MR.
None of my apps other than VLC can even read it, not Adobe or Compressor.
Best option is ffmpeg I think, as sherlockpotter suggested. Below is an H264 mp4 file converted on veryslow and crf11 from ffmpeg. Going frame by frame comparing the two it doesn’t appear that there is any generational loss (the original clip is pretty noisy btw), but there is a slight color shift towards orange in the mp4. The AVI had more pink in it, so you will want to color grade to compensate.
https://drive.google.com/file/d/1y8UFY6wObbMnOiCLyA01gyh9hGTPJrwa/view?usp=sharing
Interesting. Sounds like probably the simplest solution would be a new export of the clip with different settings if the editor is willing.