I've made some progress with my command. But I've run into a problem. In
the docs, under the drawbox command, it lists an option 'replace'
replace
Applicable if the input has alpha. With value 1, the pixels of the painted
box will overwrite the video’s color and alpha pixels. Default is 0, which
composites the box onto the input, leaving the video’s alpha intact.
This is exactly what I need. But I can't get it to work. Whenever I do a
command with it, I get:
"[Parsed_drawbox_0 @ 0x564929e46aa0] Option 'replace' not found
[AVFilterGraph @ 0x564929e44bc0] Error initializing filter 'drawbox' with
args 'enable=between(t,2,3):color=0x000000FF:t=999:replace=1'"
I tried to upgrade my ffmpeg to the latest version. I have ffmpeg version
3.4.1-1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
Does anyone know what I'm doing wrong to get the replace option to work on
drawbox?
Here is my full command:
ffmpeg -i screencast.avi -ss -2 -i output.avi -filter_complex
"[0:v]drawbox=enable='between(t,2,3)':color=0x000000FF:t=999:replace=1[out];
[out][1:v]overlay=0:0:enable='between(t,2,3)':format=rgb[out2]" -strict
experimental -map [out2] output.avi
Thanks!
Josh
Hi all,
Would someone mind helping me to get a commandline correct?
I have a video, screencast.avi, of utvideo with transparency.
I extract a couple seconds of images from screencast.avi like:
ffmpeg -ss 31 -t 2 -i screencast.avi filename%03d.png
I would like to edit the images and then "put them back" into the video,
replacing the appropriate frames.
I know how to use the overlay filter, but don't know how to make it use the
whole series of images at the correct time. Plus, I can't simply overlay the
video as it has transparency. I would need to replace the frames, or blank
the appropriate frames before overlaying.
Thanks for help getting the command correct!
Josh
Here are my attempts for anyone interested:
This command uses all the images, but doesn't start and end them at the right
place:
ffmpeg -i screencast.avi -pattern_type glob -i "filename*.png"
-filter_complex overlay output.avi
This command puts the overlay in the correct frames, but only uses a single
.png file, not all of them:
ffmpeg -i screencast.avi -pattern_type glob -i "filename*.png"
-filter_complex "overlay=0:0:enable='between(t,2,3)'" output.avi
Plus, both commands incorrectly overlay the transparent images, rather than
replacing the frames.
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