--write-thumbnail truncates filename with certain output template

[Gorrrg]

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What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

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:

[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', '--skip-download', '--output', '%(uploader)s - %(upload_date)s - %(title)s (%(id)s)', '--write-description', '--write-thumbnail', 'http://www.youtube.com/watch?v=ntU6j-et1io']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2016.12.20
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg 3.2, ffprobe 3.2
[debug] Proxy map: {}
[youtube] ntU6j-et1io: Downloading webpage
[youtube] ntU6j-et1io: Downloading video info webpage
[youtube] ntU6j-et1io: Extracting video information
[youtube] ntU6j-et1io: Downloading MPD manifest
[info] Writing video description to: EthosLab - 20110224 - Let's Play Minecraft - Episode 33 - Beta 1.3 (ntU6j-et1io).description
[youtube] ntU6j-et1io: Downloading thumbnail ...
[youtube] ntU6j-et1io: Writing thumbnail to: EthosLab - 20110224 - Let's Play Minecraft - Episode 33 - Beta 1.jpg

Description of your issue, suggested solution and other information

Notice the filename of the thumbnail.

The issue is that when a YouTube title string contains any periods (46th of the ASCII character set), for example version numbers or an ellipsis, the thumbnail download routine fails to write the full file name correctly with that output template I'm using. It works fine with the default output template.

It truncates after the last period of the title string. So for example if the uploader had used a title like "My new machine 2.0.1" that would end in "My new machine 2.0.jpg" instead of "My new machine 2.0.1 (xxxxxxxxxxx).jpg" and "Oh my... oh my... oh dear" would end in "Oh my... oh my...jpg" instead of "Oh my... oh my... oh dear (xxxxxxxxxxy).jpg".

Note that I omitted downloading the video file because it was unnecessary. The video file name is ok. As far as I have noticed the truncation only happens with the thumbnail file, but it may also happen with other files youtube-dl saves.

[yan12125]

Well it's not a bug. You shouldn't omit %(ext)s in output templates.

$ youtube-dl --verbose --skip-download --output '%(uploader)s - %(upload_date)s - %(title)s (%(id)s).%(ext)s' --write-thumbnail 'http://www.youtube.com/watch?v=ntU6j-et1io'
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', '--skip-download', '--output', '%(uploader)s - %(upload_date)s - %(title)s (%(id)s).%(ext)s', '--write-thumbnail', 'http://www.youtube.com/watch?v=ntU6j-et1io']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.12.20
[debug] Git HEAD: bfa1073e1
[debug] Python version 3.5.2 - Linux-4.8.13-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 3.2.2, ffprobe 3.2.2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] ntU6j-et1io: Downloading webpage
[youtube] ntU6j-et1io: Downloading video info webpage
[youtube] ntU6j-et1io: Extracting video information
[youtube] ntU6j-et1io: Downloading MPD manifest
[youtube] ntU6j-et1io: Downloading thumbnail ...
[youtube] ntU6j-et1io: Writing thumbnail to: EthosLab - 20110224 - Let's Play Minecraft - Episode 33 - Beta 1.3 (ntU6j-et1io).jpg