Hot answers tagged vimeo
A common method is split-and-stitch where the file is cut into pieces and sent to multiple servers for transcode. That way you can transcode a file of any length in a fixed amount of time. Telestreams Episode Engine can do this, but I'm sure Google uses something custom coded.
A custom video resolution has no bearing on quality here; only the choice of encoder, bitrate/rate factor and other parameters will impact the final result. Youtube's player frame on its site is always 16:9, so if your video has an aspect ratio other than 16:9, YT will automatically add black bars as necessary. No need for the uploader to do so. However, if ...
Only top voted, non community-wiki answers of a minimum length are eligible