Hi,
I have a few videos that have been shot upside down but lack the rotate
flag so they play upside down in e.g. VLC.
Here is an example :
https://www.swisstransfer.com/d/48602faa-73aa-4c6d-b3bf-d2db6b2ffe9c
I'd like to add the rotation information without reencoding. Many pages
indicate it can be done with "-metadata:s:v rotate=180".
That is deprecated and does not work (as you have already found out.
Use these instead (excerpt of the ffmpeg documenteation)
-display_rotation[:stream_specifier] rotation (/input,per-stream/)
Set video rotation metadata.
rotation is a decimal number specifying the amount in degree by
which the video should be rotated counter-clockwise before being
displayed.
This option overrides the rotation/display transform metadata stored
in the file, if any. When the video is being transcoded (rather than
copied) and |-autorotate| is enabled, the video will be rotated at
the filtering stage. Otherwise, the metadata will be written into
the output file if the muxer supports it.
If the |-display_hflip| and/or |-display_vflip| options are given,
they are applied after the rotation specified by this option.
-display_hflip[:stream_specifier] (/input,per-stream/)
Set whether on display the image should be horizontally flipped.
See the |-display_rotation| option for more details.
-display_vflip[:stream_specifier] (/input,per-stream/)
Set whether on display the image should be vertically flipped.
See the |-display_rotation| option for more details.
These need to be set BEFORE the inputvideo (before -i)! For example 90
degree counter-clockwise rotation:
|ffmpeg -display_rotation:v:0 90.0 -i input.mp4 -c copy output.mp4|
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