Technotes for future me



Inspect video

ffmpeg -i <input>

Converting MPEG2 video to H265

For old MPEG2 videos it is often just enough to recode them with automatic bitrate to lower the file size

ffmpeg -i <input>.MPG -acodec aac -vcodec libx265 <output>.mp4

H265 2-pass encoding

For H265 2-pass encoding you need to combine 2 ffmpeg calls. Example from ffmpeg:

ffmpeg -y -i input -c:v libx265 -b:v 2600k -x265-params pass=1 -an -f mp4 /dev/null && \
ffmpeg    -i input -c:v libx265 -b:v 2600k -x265-params pass=2 -c:a aac -b:a 128k output.mp4

Fixing rotation

Do not recode for rotation but simple add a video metadate field for the rotation angle

ffmpeg -i <input> -c copy -metadata:s:v:0 rotate=90 <output>


Last updated on 31 Jan 2021
Published on 25 Dec 2019
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