Can not use ffmpeg to convert a flv file into mp4 file

Question

I have a flv file, which can be played normally with potplayer, but it cannot be converted into mp4 format with ffmpeg. File: https://www.mediafire.com/file/ukexdhw15tyfrcx/2.22_xindongfang.flv/file

I typed ffmpeg -i 2.22_xindongfang.flv -acodec copy -vcodec copy test.mp4, and the following error log appeared:

[mp4 @ 0000018bbe928880] dimensions not set
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:1 --