用于在 5 个视频之间淡入淡出的 FFmpeg 命令.如何管理 setpts=PTS-STARTPTS? [英] FFmpeg command for crossfading between 5 videos .How to manage setpts=PTS-STARTPTS?

问题描述

在这里，FFmpeg 中的新功能.我在 FFmpeg 的控制台中使用和测试.

Here, New in FFmpeg . I am using and testing in console in FFmpeg .

我已经完成了 2 个带有交叉淡入淡出的视频加入这个问题:我正在为 5 个视频合并淡入淡出我刚刚完成了 90% 的合并我只需要管理 setpts=PTS-STARTPTS 看看这个请.

ffmpeg -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i 
big_buck.mp4 -filter_complex "[0:v]trim=0:4,setpts=PTS-
STARTPTS,fade=out:st=4:d=1:alpha=1[1]; [1:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[2]; 
[2:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[3]; 
[3:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[4]; 
[4:v]trim=1:4,setpts=PTS-STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1[5]; 
[1][2]overlay,format=yuv420p[12]; [12][3]overlay,format=yuv420p[123]; [4]
[5]overlay,format=yuv420p[45]; [123][45]concat=n=2 [v]" -map [v]  result.mp4

****注意每个输入视频 big_buck.mp4 长度为 5 秒 ****.现在在代码中看到 setpts=PTS-STARTPTS 如何在每个视频输入中管理它???

****Note that every input video big_buck.mp4 length is 5 sec ****. now see setpts=PTS-STARTPTS in code How to Manage that in every video Input????

我也在各种论坛上看到过，但我没有找到！！！谢谢

I also see in variuos forums about that but i didnt find!!! Thank you

推荐答案

使用

ffmpeg -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i 
big_buck.mp4 -filter_complex 
"[0:v]setpts=PTS-STARTPTS[v1]; 
 [1:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(4/TB)[v2]; 
[2:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(8/TB)[v3]; 
[3:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(12/TB)[v4]; 
[4:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(16/TB)[v5]; 
[v1][v2]overlay[v12]; [v12][v3]overlay[v123]; [v123][v4]overlay[v1234]; [v1234][v5]overlay,format=yuv420p[v]" 
-map [v]  result.mp4

必须修改 PTS，以便每个新剪辑在当前剪辑组合结束前 1 秒开始，即第 3 个剪辑应在 8 秒开始淡入，因为前两个剪辑的组合是 9 秒(4 秒)第一个剪辑 + 1 秒过渡 + 第二个剪辑的 4 秒).

The PTS has to be modified so that each new clip starts 1 second before the current combination of clips ends i.e. the 3rd clip should start fading in at 8 seconds, since the combination of the first two clips is 9 seconds (4 seconds of first clip + 1 second transition + 4 seconds of 2nd clip).

您不需要淡出，因为下一个剪辑在顶部淡入.仅当您想要剪切时才需要连接.

You don't need the fade out as the next clip is fading in on top. The concat is only required if you want a cut.

使用音频交叉淡入淡出:

With audio crossfades:

ffmpeg -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i 
big_buck.mp4 -filter_complex 
"[0:v]setpts=PTS-STARTPTS[v1]; 
 [1:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(4/TB)[v2]; 
[2:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(8/TB)[v3]; 
[3:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(12/TB)[v4]; 
[4:v]format=yuva420p,fade=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+(16/TB)[v5]; 
[v1][v2]overlay[12]; [12][v3]overlay[123]; [123][v4]overlay[1234]; [1234][v5]overlay,format=yuv420p[v]; 
[1][2]acrossfade=d=1[a12]; [a12][3]acrossfade=d=1[a123]; [a123][4]acrossfade=d=1[a];" 
-map [v] -map [a] result.mp4

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