Unable to download multiple requested files of a single video

[zeronotnull]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.03.20. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.03.20

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

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 ```):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-f', u'266/264/137/136,171', u'-k', u'-w', u'--no-mtime', u'https://www.youtube.com/watch?v=iNJdPyoqt8U', u'--merge-output-format', u'mkv', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.03.20
[debug] Python version 2.7.12 - Linux-4.4.0-66-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: avconv 2.8.11-0ubuntu0.16.04.1, avprobe 2.8.11-0ubuntu0.16.04.1, ffmpeg 2.8.11-0ubuntu0.16.04.1, ffprobe 2.8.11-0ubuntu0.16.04.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] iNJdPyoqt8U: Downloading webpage
[youtube] iNJdPyoqt8U: Downloading video info webpage
[youtube] iNJdPyoqt8U: Extracting video information
[youtube] iNJdPyoqt8U: Downloading MPD manifest
[info] iNJdPyoqt8U: downloading video in 2 formats
[debug] Invoking downloader on u'https://r7---sn-vuxbavcx-5uie.googlevideo.com/videoplayback?id=88d25d3f2a2ab7c5&itag=266&source=youtube&requiressl=yes&pl=16&mv=m&ms=au&mn=sn-vuxbavcx-5uie&initcwndbps=826250&mm=31&pcm2cms=yes&ratebypass=yes&mime=video/mp4&gir=yes&clen=702406140&lmt=1478651470501289&dur=308.508&mt=1489960882&signature=675E20692C4672647DDF8CAA8DFB95DF303A972D.34BCF6AEFC186B38BD74BF925D5620CC70CF9A6C&key=dg_yt0&upn=buVw8DTcoUY&ip=94.66.41.198&ipbits=0&expire=1489982581&sparams=ip,ipbits,expire,id,itag,source,requiressl,pl,mv,ms,mn,initcwndbps,mm,pcm2cms,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: COSTA RICA IN 4K 60fps (ULTRA HD) w_ Freefly Movi-iNJdPyoqt8U.mp4
[download] 100% of 669.87MiB in 11:00
[debug] Invoking downloader on u'https://r7---sn-vuxbavcx-5uie.googlevideo.com/videoplayback?pcm2cms=yes&clen=5256850&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&mime=audio%2Fwebm&ipbits=0&initcwndbps=826250&requiressl=yes&lmt=1473220729676385&dur=308.508&source=youtube&key=yt6&signature=487262F24C0C89AD6C9DC5D82AF3E7F38C276C48.4BB1006BA0E49BB48F1041BBA54FE2FB2FB2A9BA&gir=yes&expire=1489982581&upn=skL3jbwwUyU&itag=171&pl=16&ip=94.66.41.198&ms=au&ei=FQDPWPnQD5OiWP7HjZAC&mv=m&mt=1489960882&id=o-AAFVEs8sxlKb1p8980U_b_ysIWvQM3nxaB5mrE3nWViV&mn=sn-vuxbavcx-5uie&mm=31&keepalive=yes&ratebypass=yes'
[download] Destination: COSTA RICA IN 4K 60fps (ULTRA HD) w_ Freefly Movi-iNJdPyoqt8U.webm
[download] 100% of 5.01MiB in 00:04

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Description of your issue, suggested solution and other information

My Full HD Samsung TV cannot play 4K videos. As a result I have to bring any 4K video in its native resolution. In order to avoid typing multiple commands I followed the information written in the help files and issued the below commands but I only got one video file not four as I expected.

command for the URL:
var="https://www.youtube.com/watch?v=iNJdPyoqt8U"

command for the videos list:
youtube-dl -F -k -w --no-mtime --prefer-free-formats --audio-format "best" --audio-quality 0 $var --verbose

command for the combo downloading:
youtube-dl -f 266/264/137/136,171 -k -w --no-mtime $var --merge-output-format mkv --verbose

the following commands were also tried and gave similar poor results:
youtube-dl -f 266/264/137/136 -k -w --no-mtime $var --merge-output-format mkv --verbose
youtube-dl -f 136/137/264/266 -k -w --no-mtime $var --merge-output-format mkv --verbose
youtube-dl -f 266,264,137,136 -k -w --no-mtime $var --merge-output-format mkv --verbose
youtube-dl -f 266+171,264+171,137+171,136+171 -k -w --no-mtime $var --merge-output-format mkv --verbose
youtube-dl -f 266+264+137+136+171 -k -w --no-mtime $var --merge-output-format mkv --verbose
youtube-dl -f 266+264+137+136 -k -w --no-mtime $var --merge-output-format mkv --verbose

[dstftw]

With -f 266/264/137/136,171 you get two videos not one as it clearly seen from the log:

[info] iNJdPyoqt8U: downloading video in 2 formats
...
[download] Destination: COSTA RICA IN 4K 60fps (ULTRA HD) w_ Freefly Movi-iNJdPyoqt8U.mp4
...
[download] Destination: COSTA RICA IN 4K 60fps (ULTRA HD) w_ Freefly Movi-iNJdPyoqt8U.webm

-f 266/264/137/136,171 is not supposed to download 4 videos. Several videos to be downloaded are separated with comma not slash. Bother to read FAQ.
If you download several formats with the same extension you must provide output template with format_id to ensure filename unicity.