video captured from iphone gets rotated when converted to .mp4 using ffmpeg

Question

When I try to upload videos captured from my iPhone in my app, the server performs a conversion from .mov to .mp4 so that it can be played in other platforms. However the pr

Answer 1

I've filmed the video with Ipad3 and it was oriented upside down, which I suppose is the common situation of all Apple devices at some versions. Besides of it, the 3-minutes long MOV file (1920x1090) took about 500 Mb in size, which made it not available to share easily. I had to convert it to MP4, and analyzing all threads I've found on stackoverflow, here's the final code string for ffmpeg I've used (ffmpeg ver. 2.8.4):

ffmpeg -i IN.MOV -s 960x540 -metadata:s:v rotate="0" -acodec libmp3lame OUT.mp4

I suppose you may just leave '-metadata:s:v rotate="0"' if you don't need the resize and audio codec change. Note that if you resize the video, width and height should fully divide to 4.