ffmpeg找不到合适的输出格式

 [NULL @ 00000255f08dd740] Unable to find a suitable output format for 'https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full.7z' https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full.7z: Invalid argument

请问这种错误怎么解决

用指令播的吧，流里面没带格式要自己加一下哦