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I recently learned how to edit videos. The video resources I downloaded from BT seeds are all in mkv format and cannot be directly imported into video editing software. In this case, you need to use some format conversion tools to convert them, or you can use ffmpeg for editing.

ffmpeg is a command line tool used to edit local audio and video software. This is also the first time I use ffmpeg. Although I know its powerful functions, I installed it on my computer after understanding it before, but I haven't touched it. I took this opportunity to try it.

First, I used Thunder to download the film and television resources to the following directory:

There are two ways to use ffmpeg to process a file:

• ffmpeg -i 要转换的视频地址 转换后的视频存放地址
• ffmpeg -i 要转换的视频地址 -c copy 转换后的视频存放地址
  The difference between the two methods is that the former will re-encode the original video before converting, while the latter will convert directly without encoding. So the latter is faster. Here we choose the second method to try to convert the first mkv file in the above picture, and the output directory is my desktop.

After entering the first part of the command, drag the file directly to the space on the command line to automatically paste the directory, and continue to enter your own storage path. I save it to the desktop first, /Users/guolianxin/Desktop, as follows:

I found an error because the storage path does not refer to a folder, but to the converted format.

I re-added the file name and format suffix that the content was to be saved as, and successfully generated the target file on the desktop.

There was a problem opening the file: the message "Cannot open file or stream" appeared.

The error is as follows:
[mp4 @ 0x12f607870] track 1: codec frame size is not set [mp4 @ 0x12f607870] flac in MP4 support is experimental, add '-strict -2' if you want to use it. Could not write header for output file #0 (incorrect codec parameters ?): Experimental feature Error initializing output stream 0:1 --

After searching online, I found that using flac when encoding to mp4 is experimental, and that I need to add the command to allow it, and that there is a problem with the file header being written.

I don't know how to do it either, so I found other commands:
ffmpeg -i 输入路径 -c:v copy -c:a aac -strict -2 输出路径
Then it took more than ten seconds to process and successfully exported: