ffmpeg旋转叠加问题

Question

I want to execute a command using ffmpeg so it performs three tasks for me at once:

1. croping the video (OK)
2. rotate the video for 90° (OK) and
3. add an overlay

Unfortunately, the tasks 1 and 2 are performed, but the overlay isn't. Please help me.. Here's the command I'm using:

ffmpeg -i " + path + " -i /storage/emulated/0/image.png -filter_complex [0]crop=" + cut + ":" + cut + ":0:0 -metadata:s:v:0 rotate=90 -c:a [a];[a][1]overlay=10:10 -preset ultrafast -codec:a copy /storage/emulated/0/Nitin/" + videoFile;

Answer 1

By using the options -metadata:s:v:0 rotate=90 , you were settings the rotate matrix in your video stream.

It seems your filters are not chained in your filter graph. You could achieve all your goals in a filter chain.

[in] ---> crop ---> transpose ---> overlay ---> [out]
                                 ^
                                 |
     ---> movie -----------------|

The filter graph showed above can be specified with -vf option like below.

ffmpeg -i input.mp4 -vf "crop=200:200:12:34,transpose=1 [ct];movie=/path/to/the/overlay/image.png [movie];[ct] [movie]overlay=(W-w)/2:(H-h)/2" -c:a copy -c:v libx264 output.mp4

You should change crop parameters to yours, the transpose filter with 1 parameter will rotate clock wise by 90 degree, see here for more information.

Also change the movie filter parameter to the path of your image.

At last, these two outputs will centred overlay to generate final output.