Akkariin/youtube-dl
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README.md: clarify how to combine + and /

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A while back I wanted to use both merging and precedence in format
selection. I encountered complaints from the program and eventually
figured out I was doing it backwards.

I was trying things like this:

`-f 136/mp4/bestvideo+140/m4a/bestaudio`

When what I needed to do was:

`-f 136+140/mp4+m4a/bestvideo+bestaudio`

I wrote two lines to try to clarify this. I hope this is ok.

--Matt
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Producer Matt 2019-12-22 19:20:06 -06:00
parent 2dbc0967f2
commit dd487fa4cb
1 changed files with 4 additions and 1 deletions
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README.md
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@ -684,7 +684,7 @@ Note that none of the aforementioned meta fields are guaranteed to be present si
Formats for which the value is not known are excluded unless you put a question mark (`?`) after the operator. You can combine format filters, so `-f "[height <=? 720][tbr>500]"` selects up to 720p videos (or videos where the height is not known) with a bitrate of at least 500 KBit/s.
You can merge the video and audio of two formats into a single file using `-f <video-format>+<audio-format>` (requires ffmpeg or avconv installed), for example `-f bestvideo+bestaudio` will download the best video-only format, the best audio-only format and mux them together with ffmpeg/avconv.
You can merge the video and audio of two formats into a single file using `-f <video-format>+<audio-format>` (requires ffmpeg or avconv installed), for example `-f bestvideo+bestaudio` will download the best video-only format, the best audio-only format and mux them together with ffmpeg/avconv. If you want to merge video and audio formats with precedence, group the video and audio together with `+` and then use `/`, for example `-f 136+140/mp4+m4a/bestvideo+bestaudio`.
Format selectors can also be grouped using parentheses, for example if you want to download the best mp4 and webm formats with a height lower than 480 you can use `-f '(mp4,webm)[height<480]'`.
@ -706,6 +706,9 @@ $ youtube-dl -f 'bestvideo[height<=480]+bestaudio/best[height<=480]'
# Download best video only format but no bigger than 50 MB
$ youtube-dl -f 'best[filesize<50M]'
# Download preferred formats, with merge and precedence
$ youtube-dl -f '136+140/mp4+m4a/bestvideo+bestaudio'
# Download best format available via direct link over HTTP/HTTPS protocol
$ youtube-dl -f '(bestvideo+bestaudio/best)[protocol^=http]'