Request: "artist"/"album" option in output template for Bandcamp

[blha303]

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What is the purpose of your issue?

• Feature request (request for a new functionality)

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Description of your issue, suggested solution and other information

I'm building a wrapper for downloading a Bandcamp collection by loading the URLs from the page and iterating over them. I'd like to create subdirectories in the format "{artist} - {album}" but this information is not scraped. Example:

$ youtube-dl https://eeveebeats.bandcamp.com/track/lily -j | jq
{
  "webpage_url": "https://eeveebeats.bandcamp.com/track/lily",
  "format_id": "mp3-128",
  "url": "<snip>",
  "extractor_key": "Bandcamp",
  "vcodec": "none",
  "http_headers": {
    "Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
    "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/47.0 (Chrome)",
    "Accept-Language": "en-us,en;q=0.5",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
    "Cookie": "<snip>",
    "Accept-Encoding": "gzip, deflate"
  },
  "requested_subtitles": null,
  "abr": 128,
  "display_id": "344329267",
  "extractor": "Bandcamp",
  "formats": [
    {
      "url": "<snip>",
      "protocol": "http",
      "format": "mp3-128 - audio only",
      "format_id": "mp3-128",
      "acodec": "mp3",
      "ext": "mp3",
      "http_headers": {"<snip>": ""}
  ],
  "_filename": "lily-344329267.mp3",
  "playlist": null,
  "acodec": "mp3",
  "fulltitle": "lily",
  "title": "lily",
  "webpage_url_basename": "lily",
  "thumbnail": "https://f4.bcbits.com/img/a0275924560_5.jpg",
  "playlist_index": null,
  "thumbnails": [
    {
      "id": "0",
      "url": "https://f4.bcbits.com/img/a0275924560_5.jpg"
    }
  ],
  "id": "344329267",
  "protocol": "http",
  "duration": 198.857,
  "ext": "mp3",
  "format": "mp3-128 - audio only"
}

Retrieving the artist and album info is fairly easy, artist:

<span itemprop="byArtist"><a href="http://eeveebeats.bandcamp.com">Eevee</a></span>

and album, where available:

<span itemprop="inAlbum" itemscope itemtype="http://schema.org/MusicAlbum"><a href="/album/unexpected" itemprop="url"><span itemprop="name">Unexpected</span></a></span>

Ideally, when fetching a whole album, the track numbers could be included as well, but that's not important :)

[blha303]

Thank you!