使用ffmpeg python阅读视频时如何忽略自动旋转

将**{'noautorotate':''}替换为**{'noautorotate':None}.

正确语法:

process = (
        ffmpeg
        .input(self.file, **{'noautorotate':None})
        .output('pipe:', format='rawvideo', pix_fmt='yuv420p', loglevel=1, vsync='0')
        .run_async(pipe_stdout=True)
)

使用**{'noautorotate':''}时，FFmpeg输出错误:

Option noautorotate (automatically insert correct rotate filters) cannot be applied to output url -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to.
Error parsing options for output file .
Error opening output files: Invalid argument

对于测试，我们可以添加.global_args('-report')，并查看日志(log)文件.

执行以下命令:

process = (
    ffmpeg
    .input('input.mkv', **{'noautorotate':None})
    .output('pipe:', format='rawvideo', pix_fmt='yuv420p', vsync='0')
    .global_args('-report')
    .run_async()
    .wait()
)

The log file shows the built FFmpeg command line - looks correct:
ffmpeg -noautorotate -i input.mkv -f rawvideo -pix_fmt yuv420p -vsync 0 pipe: -report

执行以下命令:

process = (
    ffmpeg
    .input('input.mkv', **{'noautorotate':''})
    .output('pipe:', format='rawvideo', pix_fmt='yuv420p', vsync='0')
    .global_args('-report')
    .run_async()
    .wait()
)

The log file shows the following built FFmpeg command line:
ffmpeg -noautorotate -i input.mkv -f rawvideo -pix_fmt yuv420p -vsync 0 pipe: -report

在-i之前只有一个额外的空格，但出于某种原因，FFmpeg将其解释为URL(我认为这可能是一个与Unicode相关的问题-空字符串被解释为不是空格的字符).