youtube-dl causes"Unable to find a suitable output format for 'file:xyz/.mkv.temp'"

[DeadSix27]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.06.23.1. 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 Issues with outdated version will be rejected.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 2016.06.23.1

Before submitting an issue make sure you have:

• 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
• Other

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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:

$ ./youtube-dl https://www.youtube.com/watch?v=nZQQUShfdEs -o tdl/ -v -f bestvideo+bestaudio
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'https://www.youtube.com/watch?v=nZQQUShfdEs', u'-o', u'tdl/', u'-v', u'-f', u'bestvideo+bestaudio']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.06.23.1
[debug] Python version 2.7.11+ - Linux-4.4.0-24-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg N-80573-gbfbffbd-static, ffprobe N-80573-gbfbffbd-static, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] nZQQUShfdEs: Downloading webpage
[youtube] nZQQUShfdEs: Downloading video info webpage
[youtube] nZQQUShfdEs: Extracting video information
[youtube] nZQQUShfdEs: Downloading MPD manifest
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on u'https://********'
[download] Resuming download at byte 74851129
[download] Destination: tdl/.f315
[download] 100% of 134.38MiB in 00:12
[debug] Invoking downloader on u'https://*********'
[download] Destination: tdl/.f140
[download] 100% of 913.21KiB in 00:00
[ffmpeg] Merging formats into "tdl/.mkv"
[debug] ffmpeg command line: ffmpeg -y -i file:tdl/.f315 -i file:tdl/.f140 -c copy -map 0:v:0 -map 1:a:0 file:tdl/.mkv.temp
ERROR: file:tdl/.mkv.temp: Invalid argument
Traceback (most recent call last):
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 1786, in post_process
    files_to_delete, info = pp.run(info)
  File "./youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 445, in run
    self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
  File "./youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 168, in run_ffmpeg_multiple_files
    raise FFmpegPostProcessorError(msg)
FFmpegPostProcessorError
...


FFMPEG Output:
[NULL @ 0x5071860] Unable to find a suitable output format for 'file:tdl/.mkv.temp'
file:tdl/.mkv.temp: Invalid argumen
<end of log>

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Description of your issue, suggested solution and other information

youtube-dl does not tell ffmpeg the output format and ffmpeg can't tell by itself due to the ".temp" extension, running the ffmpeg command myself with -f mp4 works just fine, however I could not find any documentation on a command argument for youtube-dl anywhere, that tells it to "append" "-f XXX" to the output.

PS: If this is a dublicate then I couldn't find the first occurance, I've went through the issues and searched them for similliar ones, i found one but thats about mp4 and the ""solutions"" mentioned there, didn't fix my issue.

[yan12125]

Use:

youtube-dl https://www.youtube.com/watch?v=nZQQUShfdEs -o "tdl/%(title)s-%(id)s.%(ext)s" -v -f bestvideo+bestaudio

[DeadSix27]

Thanks! Didn't think about simply changing the actual filename it writes the files to...