Transcoding vertical video to an intermediate codec I used the Android SDK to record some steps for a tutorial video and am having some difficulty working with the footage. First of all, it's of a variable framerate and secondly it's in 1080:1920 - vertical 1080p.

I had hoped to use ffmpeg to transcode to DNxHD but I can't find the right video filter (scale? hflip?) to squeeze it into a resolution that DNxHD supports while retaining the aspect ratio.

I've tried:

ffmpeg -i "recording6.mp4" -vf "scale=-1:1080" -vcodec dnxhd -r 60 -b:v 36M "recording6_DNxHD.mov"

ffmpeg -i "recording6.mp4" -vf "scale=1920:1080" -vcodec dnxhd -r 60 -b:v 36M "recording6_DNxHD.mov"

ffmpeg -i "recording6.mp4" -vf hflip -vcodec dnxhd -r 60 -b:v 36M "recording6_DNxHD.mov"

ffmpeg -i "recording6.mp4" -vf vflip -vcodec dnxhd -r 60 -b:v 36M "recording6_DNxHD.mov"


The first fails because of an unsupported resolution, the second works but changes the aspect ratio, and the third and fourth also fail due to unsupported resolutions.

I realize there are other codecs which are more forgiving than dnxhd in terms of resolution, but I really don't want to lose any detail at this step. So if anyone knows of one which is similarly visually-lossless I'm open to trying it.

Any help you can offer would be much appreciated.
Assuming your editor can rotate videos, use

ffmpeg -i "recording6.mp4" -vf "transpose=1" -vcodec dnxhd -r 60 -b:v 36M "recording6.mov"


This will rotate the video, so the 1080x1920 video becomes 1920x1080.