FFmpeg-将一个视频叠加到另一个视频上?
问题描述:
我知道这是一个非常开放的问题.我已经初步阅读了 FFmpeg ,但现在需要一些指导.
I understand that this is a very open ended question. I have done some initial reading into FFmpeg, but now require some guidance.
问题
- 我有一个视频
input.mov
. - 我想在
overlay.wov
上方叠加另一个视频. - 结果应为单个视频(
output.mov
). - 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
). - 完成对 FFmpeg 的初步阅读,并阅读
- Done some initial reading into FFmpeg and read this question.
Problem
谢谢-C.
- 后端是Go/Ruby.开放使用新语言.
- 应该保留第一个视频中的音频.
- 设置覆盖开始的时间间隔会很好.
当前解决方案
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
这几乎可行,但是:
- 即使两个视频(
input.mov
&overlay.mov
)的长度相同,覆盖也会被缩短. - 我不能在除
0:00
之外的任何时间间隔开始覆盖.
- 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
.
答
如果只需要ffmpeg命令,请尝试
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
这会在5秒钟时开始覆盖,覆盖的视频起点为00:15
.
This starts the overlay at 5 seconds with the overlaid video start point being 00:15
.
setpts=PTS-10/TB
是setpts=PTS+(overlay_delay-video_trim_in)/TB
overlay=enable=gte(t\,5)
是overlay=enable=gte(t\,overlay_delay)