* acodec Name of the audio codec in use
* vbr Average video bitrate in KBit/s
* vcodec Name of the video codec in use
+ * quality_name Human-readable name of the video quality.
+ * filesize The number of bytes, if known in advance
webpage_url: The url to the video webpage, if given to youtube-dl it
should allow to get the same result again. (It will be set
by YoutubeDL if it's missing)