Question

使用以下命令：

ffmpeg -i test.mp4 -vf "select='not(mod(n,2000))',setpts=N/3/TB" -r 3 output.gif

我在3fps的GIF文件中每2000帧写一帧。

但是当我看到ffmpeg的输出时，有一些令人困惑的事情：

speed=0.00997frame=    1 fps=0.7 q=-0.0 size=       1kB time=00:00:00.01
speed=0.00498frame=    1 fps=0.4 q=-0.0 size=       1kB time=00:00:00.01
speed=0.00332frame=    2 fps=0.6 q=-0.0 size=       2kB time=00:00:00.34
speed=0.0847xframe=    2 fps=0.4 q=-0.0 size=       2kB time=00:00:00.34
speed=0.0678xframe=    2 fps=0.4 q=-0.0 size=       2kB time=00:00:00.34
speed=0.0565xframe=    2 fps=0.3 q=-0.0 size=       2kB time=00:00:00.34
speed=0.0968xframe=    3 fps=0.4 q=-0.0 size=      20kB time=00:00:00.68
speed=0.0847xframe=    3 fps=0.4 q=-0.0 size=      20kB time=00:00:00.68
speed=0.0753xframe=    3 fps=0.3 q=-0.0 size=      20kB time=00:00:00.68
speed=0.0678xframe=    4 fps=0.4 q=-0.0 size=      41kB time=00:00:01.01
speed=0.0915xframe=    4 fps=0.3 q=-0.0 size=      41kB time=00:00:01.01
speed=0.0839xframe=    4 fps=0.3 q=-0.0 size=      41kB time=00:00:01.01
speed=0.0774xframe=    4 fps=0.3 q=-0.0 size=      41kB time=00:00:01.01
speed=0.0954xframe=    5 fps=0.3 q=-0.0 size=      66kB time=00:00:01.34
speed=0.089x frame=    5 fps=0.3 q=-0.0 size=      66kB time=00:00:01.34
speed=0.0834xframe=    5 fps=0.3 q=-0.0 size=      66kB time=00:00:01.34
speed=0.0785xframe=    6 fps=0.3 q=-0.0 size=      90kB time=00:00:01.68
speed=0.093x frame=    6 fps=0.3 q=-0.0 size=      90kB time=00:00:01.68
speed=0.0881xframe=    6 fps=0.3 q=-0.0 size=      90kB time=00:00:01.68
speed=0.0837xframe=    6 fps=0.3 q=-0.0 size=      90kB time=00:00:01.68

看起来每个目标帧都会重建多次。我希望这样的事情：

speed=0.00997frame=    1 fps=0.7 q=-0.0 size=       1kB time=00:00:00.01
speed=0.00332frame=    2 fps=0.6 q=-0.0 size=       2kB time=00:00:00.34
speed=0.0968xframe=    3 fps=0.4 q=-0.0 size=      20kB time=00:00:00.68
speed=0.0678xframe=    4 fps=0.4 q=-0.0 size=      41kB time=00:00:01.01
speed=0.0954xframe=    5 fps=0.3 q=-0.0 size=      66kB time=00:00:01.34
speed=0.0785xframe=    6 fps=0.3 q=-0.0 size=      90kB time=00:00:01.68

我错过了什么吗？

（这是ffmpeg - multiple output with thumbnails）

的后续内容

Answer 1

那只是进度报告。每次刷新报告时，如果尚未对新帧进行编码，它将显示相同的数字。 fps速度1.0表示每秒编码1帧。因此，如果进度报告在一秒钟内有两次刷新，则第二次刷新将显示相同的帧数。

ffmpeg - 多次写入相同的帧？

1 个答案: