The problem – I had taken a video on a smart phone upside down and needed to rotate it (Note – rotating is not the same as flipping). Here is the successful command I used on Ubuntu:<\/p>\n
Note – I needed to rotate it so chaining two 90 degree transpose commands (transpose=1 is a single 90 degree transposition) worked (see How can I rotate video by 180 degrees with avconv<\/a>).<\/p>\n Note the -r 25. I don’t pretend to understand all the options of ffmpeg\/avconv but the -r 25 forced the conversion to use a manageable number of frames. Without it, converting one particular video was failing, thrashing the CPU, and taking forever. There was a message in the ffmpeg\/avconv output about MB rate > level limit. Another video worked fine without -r 25 but if you have the same problem with MB rate give -r 25 a try. Or better yet, learn more about what you’re doing ;-). I didn’t have the time or inclination so tried to do the least I could to get a good result.<\/p>\n Update – needed to alter aspect ratio as per:<\/p>\n The problem – I had taken a video on a smart phone upside down and needed to rotate it (Note – rotating is not the same as flipping). Here is the successful command I used on Ubuntu: avconv -i “my_input_video.mp4” … Continue reading avconv -i \"my_input_video.mp4\" -r 25 -vf transpose=1,transpose=1 my_output_video.mp4<\/code><\/p>\navconv -i \"my_image.MOD\" -aspect 0.487<\/strong> -r 25 -vf transpose=1,transpose=1,transpose=1 -strict -2 \"my_image.mp4\"<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"