Download size 0 for this url and no error shown

[randinfo]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.09.15. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2017.09.15

Before submitting an issue make sure you have:

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

What is the purpose of your issue?

• [x ] 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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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

Command used :

 youtube-dl -o '/home/pt3/web/aze.com/public_html/downloads/aze.%(ext)s' -x "https://www.youtube.com/watch?v=Lo9J4lvRNR4" --no-part --prefer-ffmpeg --audio-quality 192K --audio-format mp3 --restrict-filenames --force-ipv4 --write-info-json

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

root@ns3368714:/home/pt3/web/aze.com/public_html/aze# youtube-dl -o '/home/pt3/web/aze.com/public_html/downloads/aze.%(ext)s' -x "https://www.youtube.com/watch?v=Lo9J4lvRNR4" --no-part --prefer-ffmpeg --audio-quality 192K --audio-format mp3 --restrict-filenames --force-ipv4 --write-info-json -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-o', u'/home/pt3/web/aze.com/public_html/downloads/aze.%(ext)s', u'-x', u'https://www.youtube.com/watch?v=Lo9J4lvRNR4', u'--no-part', u'--prefer-ffmpeg', u'--audio-quality', u'192K', u'--audio-format', u'mp3', u'--restrict-filenames', u'--force-ipv4', u'--write-info-json', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.09.15
[debug] Python version 2.7.12 - Linux-4.4.0-78-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 2.8.11-0ubuntu0.16.04.1, ffprobe 2.8.11-0ubuntu0.16.04.1
[debug] Proxy map: {}
[youtube] Lo9J4lvRNR4: Downloading webpage
[youtube] Lo9J4lvRNR4: Downloading video info webpage
[youtube] Lo9J4lvRNR4: Extracting video information
[youtube] {22} signature length 43.44, html5 player vflUnLBiU
[youtube] {43} signature length 43.44, html5 player vflUnLBiU
[youtube] {18} signature length 43.44, html5 player vflUnLBiU
[youtube] {36} signature length 43.44, html5 player vflUnLBiU
[youtube] {17} signature length 43.44, html5 player vflUnLBiU
[youtube] {137} signature length 43.44, html5 player vflUnLBiU
[youtube] {248} signature length 43.44, html5 player vflUnLBiU
[youtube] {136} signature length 43.44, html5 player vflUnLBiU
[youtube] {247} signature length 43.44, html5 player vflUnLBiU
[youtube] {135} signature length 43.44, html5 player vflUnLBiU
[youtube] {244} signature length 43.44, html5 player vflUnLBiU
[youtube] {134} signature length 43.44, html5 player vflUnLBiU
[youtube] {243} signature length 43.44, html5 player vflUnLBiU
[youtube] {133} signature length 43.44, html5 player vflUnLBiU
[youtube] {242} signature length 43.44, html5 player vflUnLBiU
[youtube] {160} signature length 43.44, html5 player vflUnLBiU
[youtube] {278} signature length 43.44, html5 player vflUnLBiU
[youtube] {140} signature length 43.44, html5 player vflUnLBiU
[youtube] {171} signature length 43.44, html5 player vflUnLBiU
[youtube] {249} signature length 43.44, html5 player vflUnLBiU
[youtube] {250} signature length 43.44, html5 player vflUnLBiU
[youtube] {251} signature length 43.44, html5 player vflUnLBiU
[youtube] Lo9J4lvRNR4: Downloading MPD manifest
[info] Writing video description metadata as JSON to: /home/pt3/web/aze.com/public_html/downloads/aze.info.json
[debug] Invoking downloader on u'https://r2---sn-25glen7r.googlevideo.com/videoplayback?gcr=es&expire=1505596276&ipbits=0&dur=173.181&gir=yes&mime=audio%2Fwebm&key=yt6&requiressl=yes&initcwndbps=1942500&mt=1505574577&mv=m&sparams=clen%2Cdur%2Cei%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&ms=au&ip=37.187.89.81&lmt=1492008585140187&clen=3007647&mm=31&mn=sn-25glen7r&id=o-AH652QMklI4BLBu9AoMJD3laJLCuW4hEWMCRWFVO2zh8&keepalive=yes&source=youtube&ei=Ez-9WbXVOYOHW5HjnNAH&itag=251&pl=20&signature=79CECA7B6B8C79E4FB8CFEA2DAB0A853826AE87B.3FF287C57D753C2094652CE720036897561E4191&ratebypass=yes'
[download] Destination: /home/pt3/web/aze.com/public_html/downloads/aze.webm
[download] 100% of 2.87MiB in 00:00
[debug] ffmpeg command line: ffprobe -show_streams 'file:/home/pt3/web/aze.com/public_html/downloads/aze.webm'
[ffmpeg] Destination: /home/pt3/web/aze.com/public_html/downloads/aze.mp3
[debug] ffmpeg command line: ffmpeg -y -i 'file:/home/pt3/web/aze.com/public_html/downloads/aze.webm' -vn -acodec libmp3lame '-b:a' 192k 'file:/home/pt3/web/aze.com/public_html/downloads/aze.mp3'
Deleting original file /home/pt3/web/aze.com/public_html/downloads/aze.webm (pass -k to keep)

...
<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

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Description of your issue, suggested solution and other information

Explanation of your issue in arbitrary form goes here. Please make sure the description is worded well enough to be understood. Provide as much context and examples as possible.
If work on your issue requires account credentials please provide them or explain how one can obtain them.

[dstftw]

As clearly seen from the log download and conversion finished successfully meaning it can't be 0 sized. Prove it's 0 size right after conversion finishes.

[randinfo]

It's weird maybe a file writing bug thanks for your reply