[README.md] Document format_id field in output template section (#6557)

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Yen Chi Hsuan 2015-08-14 19:18:03 +08:00
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commit 4d2ad866f3

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@ -272,6 +272,7 @@ # OUTPUT TEMPLATE
- `autonumber`: The sequence will be replaced by a five-digit number that will be increased with each download, starting at zero.
- `playlist`: The name or the id of the playlist that contains the video.
- `playlist_index`: The index of the video in the playlist, a five-digit number.
- `format_id`: The sequence will be replaced by the format code specified by `--format`.
The current default template is `%(title)s-%(id)s.%(ext)s`.