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Is there any way to recode in ffmpeg by setting the desired output size? I mean something like this
ffmpeg -i in.mp4 -size 650MB out.mp4
So ffmpeg (or a wrapper) calculates the size of the picture, codec, bitrate, and so..
Note that
file size = bitrate * durationandbitrate = file size / duration. You know your desired file size (650 MB) and your duration (see the output offfmpeg -i in.mp4). Now read the two-pass ABR example in the FFmpeg and x264 Encoding Guide. The example really requires the associated explanation otherwise I’d include it here.