I have encountered situations after transcoding where the Rotation parameter was not reset to 0: it was still set to 180 or 90. ffmpeg -i INPUT.mp4 -metadata:s:v rotate='0' -vf 'hflip,vflip' -c:v libx264 -crf 23 -acodec copy OUTPUT.mp4 I used ffmpeg via the command line to do this. If the video is upside down, a horizontal flip and vertical flip will be required to reorient the video properly. However, in my experience, that quality loss cannot be seen by the naked eye. To rotate the video, it will need to be transcoded, resulting in some quality loss.

I am not aware of a lossless way to rotate videos back to proper orientation. Rotating iOS and Android Videos Using ffmpeg Open the video file in VLC, mplayer, or even Google Chrome, and the video will be displayed upside down these programs are not interpreting the Rotation parameter. You will notice increased CPU usage while playing the video because it is being transcoded on the fly. In actuality, the video file has been recorded upside down. The phone and QuickTime Player interpret this parameter to rotate the video 180 degrees during playback. If the bottom of the phone was pointing to your left when recording, the Rotation parameter would be set to 180. Videos are oriented properly when viewing them on the phone and QuickTime Player because they are reorienting the video in real time by interpreting the Rotation parameter that was set in the metadata when recording began. where the microphone or Home Button is) is pointing to your right, otherwise videos will be recorded upside down and will be displayed that way when viewing them on anything except the phone and QuickTime Player. When shooting video in landscape mode, be sure the bottom of the phone (i.e. Results may differ with other and newer smartphones. The following has been verified on an iPhone 4, iPhone 5, and a Nexus 4. Have you ever recorded a video with your smartphone only to view it on a computer or TV and have it displayed upside down? If so, here’s why.

Ffmpeg rotate video thumbnail