[FFmpeg-user] Transcoding foscam mkv to mp4 is resulting in larger files

[Kai Hendry]

Hi guys,

The Input #0, mpeg transcoding into mp4 (for iPhone playback via
Safari) is resulting in up 3x larger files. Why is that?

ffprobe of a typical MKV input file:
http://ix.io/kLm

The ffmpeg log:
http://ix.io/kMw

Sidenote: Found I had to put in a frame rate of 30 else things
wouldn't work. Really not sure why. Maybe someone can explain?

Example of the input:
http://s.natalian.org/2015-09-13/MDalarm_20150911_121823.mkv


Many thanks,

p.s. code for the project will eventually land up in
https://github.com/kaihendry/camftp2web