Hi @eloy,
I am not sure if this is possible with current mp4_plugin.
What you can try is to save this stream as h264 video and play it with ffmpeg or use ffmpeg to convert it to mp4 file.
To save something to file
You can use membrane_file_plugin.
To play h264 video using ffmpeg
ffplay -f h264 video.h264.
The -f option stands for format.
To convert h264 file to mp4 one
ffmpeg -framerate 24 -i video.h264 -c copy video.mp4(source)
The -i option stands for input.
The -c option stands for codec so that -c copy means that streams will be copied into output file i.e. no reencoding will be performed.
The -framerate is video framerate. I think you can try to omit it.
