FFmpeg旋轉並縮放視頻上的圖像疊加

Question

我已經能夠使用此命令旋轉在Android視頻上疊加的圖像

String[] complexCommand2 = {"-y", "-i", videoFilePath, "-i", imagepath, "-filter_complex","[1:v] rotate=30*PI/180:c=none:ow=rotw(iw):oh=roth(ih) [rotate];[0:v][rotate] overlay=40:10",  "-codec:a","copy", outputFilePath};

但是我也想縮放圖像怎么辦

Answer 1

旋轉后縮放：（只需替換並更改為所需的值。

-filter_complex "[1:v] rotate=30*PI/180:c=none:ow=rotw(iw):oh=roth(ih) [rotate];[rotate]scale=<scale_width>:<scale_height>[scale];[0:v][scale] overlay=40:10[out]" -map [out] .......

在旋轉之前縮放：（只需替換並更改為所需的值。

-filter_complex "[1:v]scale=<scale_width>:<scale_height>[scale];[scale]rotate=30*PI/180:c=none:ow=rotw(iw):oh=roth(ih) [rotate];[0:v][rotate] overlay=40:10[out]" -map [out] .......