FFmpeg-具有4个区域和不同播放时间的多个视频 [英] FFmpeg - Multiple videos with 4 areas and different play times

问题描述

我有以下视频

video   time
======= =========
Area 1:
video1a    0-2000
video1b 2500-3000
video1c 3000-4000

Area 2:
video2a  300- 400
video2b  800- 900

Area 3:
video3a  400- 500
video3b  700- 855

Area 4:
video4a  400- 500
video4b  800- 900

基本上这些是安全摄像机的输出，应在4个区域中显示:

Basically these are security camera outputs and should display in 4 areas:

到目前为止，我有以下内容:

So far I have the following:

ffmpeg
    -i 1.avi -i 2.avi -i 3.avi -i 4.avi
    -filter_complex "
        nullsrc=size=640x480 [base];
        [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft];
        [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright];
        [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft];
        [3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright];
        [base][upperleft] overlay=shortest=1 [tmp1];
        [tmp1][upperright] overlay=shortest=1:x=320 [tmp2];
        [tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3];
        [tmp3][lowerright] overlay=shortest=1:x=320:y=240
    "
    -c:v libx264 output.mp4

但是我缺少两件事:

• 以上仅适用于4个视频文件，我需要一种向每个区域添加其他文件的方法(例如video1b应该在video1a在同一区域之后的相应时间播放)
• 如何为每个文件指定开始/结束时间，如上所示?

推荐答案

使用

ffmpeg
    -i video1a -i video2a -i video3a -i video4a
    -i video1b -i video2b -i video3b -i video4b
    -i video1c
    -filter_complex "
        nullsrc=size=640x480 [base];
        [0:v] setpts=PTS-STARTPTS+   0/TB, scale=320x240 [1a];
        [1:v] setpts=PTS-STARTPTS+ 300/TB, scale=320x240 [2a];
        [2:v] setpts=PTS-STARTPTS+ 400/TB, scale=320x240 [3a];
        [3:v] setpts=PTS-STARTPTS+ 400/TB, scale=320x240 [4a];
        [4:v] setpts=PTS-STARTPTS+2500/TB, scale=320x240 [1b];
        [5:v] setpts=PTS-STARTPTS+ 800/TB, scale=320x240 [2b];
        [6:v] setpts=PTS-STARTPTS+ 700/TB, scale=320x240 [3b];
        [7:v] setpts=PTS-STARTPTS+ 800/TB, scale=320x240 [4b];
        [8:v] setpts=PTS-STARTPTS+3000/TB, scale=320x240 [1c];
        [base][1a] overlay=eof_action=pass [o1];
        [o1][1b] overlay=eof_action=pass [o1];
        [o1][1c] overlay=eof_action=pass:shortest=1 [o1];
        [o1][2a] overlay=eof_action=pass:x=320 [o2];
        [o2][2b] overlay=eof_action=pass:x=320 [o2];
        [o2][3a] overlay=eof_action=pass:y=240 [o3];
        [o3][3b] overlay=eof_action=pass:y=240 [o3];
        [o3][4a] overlay=eof_action=pass:x=320:y=240[o4];
        [o4][4b] overlay=eof_action=pass:x=320:y=240"
    -c:v libx264 output.mp4

最短选项应应用于处理最晚结束的流的叠加层.

The shortest option should be applied to the overlay which processes the stream ending at the latest time.

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