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Youtube
=======

Commit [treason](https://git.sr.ht/~ft/treason).  It supports H.264
(allegedly all types of it as of 2020/12/11), VP8, VP9 and AV1.

*NOTE* one does not simply commit treason on anything other than AMD64
or 386.  No videos for Raspi users, sorry.  You can still play audio
only on other arches though.

Install [youtubedr](https://github.com/ftrvxmtrx/youtube):

	9fs ftrv.se
	gunzip < /n/ftrv.se/bin/youtubedr.$objtype.gz > $home/bin/$objtype/youtubedr
	chmod +x $home/bin/$objtype/youtubedr
	hget https://curl.haxx.se/ca/cacert.pem > /sys/lib/tls/ca.pem

`youtubedr` may fail with "error parsing signature tokens".  Not much
can be done here until the upstream incorporates some logic that
`youtube-dl` has.  For now, some of the videos will just fail to
download. *BUMMER*.

## Playing just audio alone

	mcfs -t 1 `"{youtubedr -i 140 -o /tmp/audio.mp4 ybGOT4d2Hs8} | audio/aacdec > /dev/audio

## Playing video and/or audio

The easiest way to play ANY video on Youtube is to use H.264
"baseline" stream.  It's of pretty bad quality image-wise, but
contains audio in the container itself and doesn't require too much
CPU resources.

	treason `"{youtubedr -i 18 -o /tmp/_vid.mp4 ybGOT4d2Hs8}; rm -f /tmp/_vid.mp4

If you want to find the best possible format, use the following script:

	#!/bin/rc
	rfork ne
	vitag=`{youtubedr -info $"1 | awk '
		/av01/ {
			tags[ntags++] = $2
			if($2 == "398"){ # prefer hd720
				tags[0] = $2
				exit
			}
		}
		END {
			if(ntags > 0)
				print tags[0]
		}
	'}
	if(~ $#vitag 0)
		treason `"{youtubedr -i 18 -o /tmp/_vid.mp4 $"1}
	if not
		treason -a `"{youtubedr -i 140 -o /tmp/_aud.mp4 $"1} `"{youtubedr -i $vitag -o /tmp/_vid.mp4 $"1}
	#rm -f /tmp/_^(aud vid)^.mp4

*TODO* This script should be extended to choose best format based on
preferences (resolution) and CPU resources.

You can put that script to `$home/bin/rc/youtube` and add a plumb rule
for Youtube URLs, right *before* `include basic`:

	type	is	text
	data	matches	'https://(www.)?youtube[^ ]+'
	plumb	start	window youtube ''''$0''''

## Caveats

Many. Patches welcome.