我需要有关ffmpeg命令的帮助
此命令将2个视频加入字幕粘贴到第二个视频，然后以2种质量（720、360）拍摄视频
我需要在第二个条目中添加水印。
D:\electron\brenda\node_modules\ffmpeg-static\bin\win32\x64\ffmpeg.exe -i C:\Users\Andy\Desktop\entrada\intros/intro_720.mp4 -i C:\Users\Andy\Desktop\entrada\videoplayback.mp4 -filter_complex [1:v]subtitles=tmp/Heartstrings_1.ass[v1]; [0:v] [0:a] [v1] [1:a] concat=n=2:v=1:a=1 [v] [a]; [v]scale=1280:720[v2] -map [v2] -map [a] -y C:\Users\Andy\Desktop\salida/720_videoplayback.mp4 -filter_complex [1:v]subtitles=tmp/Heartstrings_1.ass[v1]; [0:v] [0:a] [v1] [1:a] concat=n=2:v=1:a=1 [v] [a]; [v]scale=640:360[v2] -map [v2] -map [a] -y C:\Users\Andy\Desktop\salida/360_videoplayback.mp4
我需要帮助，我已经待了几个小时了
答案 0 :(得分：0)
“第二个输入”是指第二个输入。如果是这样，
library(tidyverse)
diamonds <- diamonds %>%
mutate(cut = factor(cut),
color = factor(color))
reduce_for_plot <- function(data, column, how_many_levels) {
column2 <- enquo(column)
of_interest <- unique(data[[deparse(substitute(column))]])[1:how_many_levels]
data %>%
filter(!! column2 %in% of_interest)
# here is where I then do some kind of mutate... to fct_drop the selected column
# this line seems to work
# value_to_put_in <- fct_drop(data[[deparse(substitute(column))]])
# but this line doesn't
# data <- data %>%
# mutate(!! column = value_to_put_in)
}
diamonds %>%
reduce_for_plot(color, 1)