How to use a different encoder?

[bat999]

Hi
When I run youtube-dl with "--extract-audio --audio-format mp3 --audio-quality 64K" it uses FFmpeg something like this:-
ffmpeg -y -i file:foo -vn -acodec libmp3lame -b:a 64k file:foo.mp3

Is it possible to use "--extract-audio" with a custom command for FFmpeg?
Something like this:-
ffmpeg -y -i foo -ac 1 -f wav - | gogo -b 64 -m m -silent stdin foo.mp3
So that it uses the faster mp3 encoder "gogo-no-coda" instead of libmp3lame.

I'm using youtube-dl with Linux Mint.

~ $ youtube-dl -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.05.09
[debug] Python version 2.7.12 - Linux-4.4.0-21-generic-x86_64-with-LinuxMint-18-sarah
[debug] exe versions: ffmpeg N-85996-g3d23219, ffprobe N-85996-g3d23219, rtmpdump 2.4

And gogo...

~ $ gogo
GOGO-no-coda ver. 3.13 ( May. 20 2004 ) is a mp3 encoder based on lame 3.88

This is an example command with libmp3lame...

~ $ youtube-dl --format worstaudio --extract-audio --audio-format mp3 --audio-quality 64K --restrict-filename --verbose http://www.bbc.co.uk/programmes/b08njwtn
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--format', u'worstaudio', u'--extract-audio', u'--audio-format', u'mp3', u'--audio-quality', u'64K', u'--restrict-filename', u'--verbose', u'http://www.bbc.co.uk/programmes/b08njwtn']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.05.09
[debug] Python version 2.7.12 - Linux-4.4.0-21-generic-x86_64-with-LinuxMint-18-sarah
[debug] exe versions: ffmpeg N-85996-g3d23219, ffprobe N-85996-g3d23219, rtmpdump 2.4
[debug] Proxy map: {}
[bbc.co.uk] b08njwtn: Downloading video page
[bbc.co.uk] b08njwb7: Downloading media selection XML
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[bbc.co.uk] b08njwb7: Downloading m3u8 information
[debug] Invoking downloader on u'http://aod-hls-uk-live.akamaized.net/usp/auth/vod/piff_abr_full_audio/b0925c-b08njwb7/vf_b08njwb7_82d70d85-22ee-4969-8019-993e09665019.ism/vf_b08njwb7_82d70d85-22ee-4969-8019-993e09665019-audio_eng_1=48000.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 17
[download] Destination: St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4
[download] 100% of 699.49KiB in 00:07
[debug] ffmpeg command line: ffprobe -show_streams file:St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4
[ffmpeg] Fixing malformated aac bitstream in "St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4"
[debug] ffmpeg command line: ffmpeg -y -i file:St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4 -c copy -f mp4 -bsf:a aac_adtstoasc file:St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.temp.mp4
[debug] ffmpeg command line: ffprobe -show_streams file:St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4
[ffmpeg] Destination: St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp3
[debug] ffmpeg command line: ffmpeg -y -i file:St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4 -vn -acodec libmp3lame -b:a 64k file:St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp3
Deleting original file St_Mary_the_Virgin_Chislet_Bells_on_Sunday_-_BBC_Radio_4-b08njwb7.mp4 (pass -k to keep
```)

[bat999]

Maybe I can do the job with a pipe instead of "--extract-audio".

This is my first attempt...

URL="http://www.bbc.co.uk/programmes/b08njwtn";\
a=$(youtube-dl --restrict-filename --get-filename $URL); \
youtube-dl --format worstaudio $URL -o - | ffmpeg -i - -ac 1 -f wav - | gogo -b 64 -m m -silent stdin "${a::-4}".mp3

[Hrxn]

Yep. Pipes, or just a simple shell script.