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. I also tried to apply a rotate filter in avidemux, but it keeps crashing when I start the encoding process.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. The video became very 'blocky'.īasically, I want the exact same quality as with above command (or as close as possible), but rotate the output by 90 degree. However, the quality of my output became very bad. So instead I used a more recent version of avconv, which does not support the -sameq option anymore ( which does not make a lot of sense anyway, as I learned). Using a rather old version of ffmpeg, it does not support the -vfilters option. Now I'd like to rotate some videos by 90 degree, retaining the other quality options. I used to apply this command to transcode videos of my mobile phone to AVI: ffmpeg -i Input.mov -s 640x360 -sameq -vcodec msmpeg4v2 -acodec libmp3lame Output.avi
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