问题
I understand that this is a very open ended question. I have done some initial reading into FFmpeg, but now require some guidance.
Problem
- I have a video
input.mov. - I would like to overlay another video on top of
overlay.wov. - The result should be a single video (
output.mov).
Notes
- Done some initial reading into FFmpeg and read this question.
Thanks - C.
Edits
- Backend is Go/Ruby. Open to using a new language.
- The audio from the first video should be kept.
- Setting the interval at which the overlay starts would be great.
Current Solution
ffmpeg -i input.mov -i overlay.mov -filter_complex "[0:0][1:0]overlay[out]" -shortest -map [out] -map 0:1 -pix_fmt yuv420p -c:a copy -c:v libx264 -crf 18 output.mov
This nearly works, however:
- Overlay is cut short even though the two videos (
input.mov&overlay.mov) are the same length. - I cannot start the overlay at any interval apart from
0:00.
回答1:
If you just want a ffmpeg command, try
ffmpeg -i input.mov -i overlay.mov \
-filter_complex "[1:v]setpts=PTS-10/TB[a]; \
[0:v][a]overlay=enable=gte(t\,5):shortest=1[out]" \
-map [out] -map 0:a \
-c:v libx264 -crf 18 -pix_fmt yuv420p \
-c:a copy \
output.mov
This starts the overlay at 5 seconds with the overlaid video start point being 00:15.
setpts=PTS-10/TB is setpts=PTS+(overlay_delay-video_trim_in)/TB
overlay=enable=gte(t\,5) is overlay=enable=gte(t\,overlay_delay)
来源：https://stackoverflow.com/questions/35269387/ffmpeg-overlay-one-video-onto-another-video