bash FFMPEG - ".mp4 no such file or directory"

Question

我正在使用 FFMPEG 将 .asf 流保存到 Ubuntu 计算机上的 mp4 中，输出文件名是时间戳。代码如下:

current_time=$(date "+%m/%d/%Y_%H:%M:%S")
ffmpeg -i http://username:password@IP:Port/videostream.asf -r 10 -vcodec copy -an -t 60 $current_time.mp4

但是，我收到“.mp4 没有此类文件或目录”错误。

Answer 1

bash does not allow to you create file-names with / present

According to POSIX "[t]he characters composing the [file] name may be selected from the set of all character values excluding the slash character and the null byte". In other words, every string between two slashes ([except the empty string]) is another directory, and you cannot create a file with a name containing slashes.

创建时不带斜杠，

ffmpeg -i http://username:password@IP:Port/videostream.asf -r 10 -vcodec copy -an -t 60 "${current_time//\//_}".mp4

(或)将时间字符串更改为在时间戳映射中不包含“/”，

current_time="$(date "+%m_%d_%Y_%H:%M:%S")"
ffmpeg -i http://username:password@IP:Port/videostream.asf -r 10 -vcodec copy -an -t 60 "${current_time}".mp4