--audio-format doesn't work when -o is set

[kraxarn]

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Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

> youtube-dl -x -v --audio-format vorbis https://www.youtube.com/watch?v=QCel4cmihUQ -o output.ogg
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-x', '-v', '--audio-format', 'vorbis', 'https://www.youtube.com/watch?v=QCel4cmihUQ', '-o', 'output.ogg']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2017.02.10
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg 2.8.4, ffprobe N-80219-g153ab83
[debug] Proxy map: {}
[youtube] QCel4cmihUQ: Downloading webpage
[youtube] QCel4cmihUQ: Downloading video info webpage
[youtube] QCel4cmihUQ: Extracting video information
[youtube] QCel4cmihUQ: Downloading MPD manifest
[debug] Invoking downloader on 'https://r2---sn-c5ioiv45c-hhme.googlevideo.com/videoplayback?id=4027a5e1c9a28544&itag=251&source=youtube&requiressl=yes&ms=au&pl=22&mv=m&initcwndbps=4411250&mn=sn-c5ioiv45c-hhme&mm=31&ratebypass=yes&mime=audio/webm&gir=yes&clen=2450112&lmt=1477884594723684&dur=148.481&mt=1486740087&signature=5117C73775B2FB38EAF1CBEC6AD0F082A2DCFBE0.2AD839D84EF09018ACB6020CFCAB7ABC8B6D7C31&key=dg_yt0&upn=y_znsvQv-WA&ip=79.136.74.52&ipbits=0&expire=1486761714&sparams=ip,ipbits,expire,id,itag,source,requiressl,ms,pl,mv,initcwndbps,mn,mm,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: output.ogg
[download] 100% of 2.34MiB in 00:00
[debug] ffmpeg command line: ffprobe -show_streams file:output.ogg
[ffmpeg] Post-process file output.ogg exists, skipping
...
<end of log>

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

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Description of your issue, suggested solution and other information

When downloading any (at least what I tested) using -o to define an output file together with defining --audio-format (and ofc -x), the --audio-format tag seems to be ignored and it just uses the default format. For example, in the current code, if I skip the "-o output.ogg" tag, it correctly downloads an ogg file with a vorbis codec, but with it, it downloads an ogg file with the opus codec.
I also tried this on Linux (OpenSUSE 42.2 x64) with Python 2.7.12 and FFmpeg 3.2 and it results in the same bug.

[dstftw]

Do not hardcode extension in output template rather use %(ext)s.

[kraxarn]

My bad, sorry, but thanks.