如何启用FFMPEG日志记录，哪里可以找到FFMPEG日志文件？ [英] How do I enable FFMPEG logging and where can I find the FFMPEG log file?

问题描述

我想能够记录FFMPEG进程，因为我正在努力计算一段视频需要多长时间进行转换，以帮助我的视频编码服务器的容量规划。如何启用日志记录和保存日志文件的位置。我在CentOS LAMP机器上安装了FFMPEG。

I want to be able to log FFMPEG processes because I am trying to work out how long a minute of video takes to convert to help with capacity planning of my video encoding server. How do I enable logging and where is the log file saved. I have FFMPEG installed on a CentOS LAMP machine.

推荐答案

FFmpeg不会写入特定的日志文件，而是发送其输出标准错误。要捕获，您需要

FFmpeg does not write to a specific log file, but rather sends its output to standard error. To capture that, you need to either

• 捕获并解析它生成


• 重定向标准错误到文件，然后阅读，之后过程完成

std错误重定向示例：

Example for std error redirection:

ffmpeg -i myinput.avi {a-bunch-of-important-params} out.flv 2> /path/to/out.txt

过程完成后，您可以检查 out.txt 。

Once the process is done, you can inspect out.txt.

做第一个选项有点棘手，但这是可能的。 （我自己做了，所以有别人，看看周围的SO和网的细节。）

It's a bit trickier to do the first option, but it is possible. (I've done it myself. So have others. Have a look around SO and the net for details.)

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