SwiftFFmpeg: Sample code, "Invalid data found when processing input" and av_register_all

Hello,

I am now trying SwiftFFmpeg as a replacement for VLCkit. I am at the very beginning of the integration, so I just integrated the sample code from README.md. It gave me an “Invalid data found when processing input” error on the very first line (try AVFormatContext(url: input)), for any video file (correctly played with ffplay). After some difficult research, if found this tutorial : http://dranger.com/ffmpeg/tutorial01.html, which gave me the solution : av_register_all() should be called before any operation. So I made this :

import CFFmpeg
class FfmpegUtils
{
    static func registerAll()
    {av_register_all()}
}

and then

//...
FfmpegUtils.registerAll()
let fmtCtx = try AVFormatContext(url: url.relativePath)
//...

which makes the sample code work.

However, av_register_all() triggers a deprecation warning, as FF_API_NEXT is defined : In avformat.h :

#if FF_API_NEXT
/**
 * Initialize libavformat and register all the muxers, demuxers and
 * protocols. If you do not call this function, then you can select
 * exactly which formats you want to support.
 *
 * @see av_register_input_format()
 * @see av_register_output_format()
 */
attribute_deprecated
void av_register_all(void);

attribute_deprecated
void av_register_input_format(AVInputFormat *format);
attribute_deprecated
void av_register_output_format(AVOutputFormat *format);
#endif

What is the correct way to do this ? Should the sample code or the lib be corrected to work right away ?