HTTP Error 404 only when specifying different video qualities by setting the iTag

[ledzeppelin]

Here the download goes successfully
$ youtube-dl "http://www.youtube.com/watch?v=uxg5xK45g7E" [youtube] Setting language [youtube] uxg5xK45g7E: Downloading video webpage [youtube] uxg5xK45g7E: Downloading video info webpage [youtube] uxg5xK45g7E: Extracting video information [youtube] uxg5xK45g7E: Encrypted signatures detected. [download] Destination: Makeshift Prodigy - Chasing Daylight (Acoustic) [Official Audio]-uxg5xK45g7E.mp4 [download] 100.0% of 141.19MiB at 3.47MiB/s ETA 00:00

And the iTag 18 exists
$ youtube-dl --list-formats "http://www.youtube.com/watch?v=uxg5xK45g7E" [youtube] Setting language [youtube] uxg5xK45g7E: Downloading video webpage [youtube] uxg5xK45g7E: Downloading video info webpage [youtube] uxg5xK45g7E: Extracting video information [youtube] uxg5xK45g7E: Encrypted signatures detected. Available formats: 37 : mp4 [1080x1920] 46 : webm [1080x1920] 22 : mp4 [720x1280] 45 : webm [720x1280] 35 : flv [480x854] 44 : webm [480x854] 34 : flv [360x640] 18 : mp4 [360x640] 43 : webm [360x640] 5 : flv [240x400] 17 : mp4 [144x176]

But I can't download it
$ youtube-dl -F 18 "http://www.youtube.com/watch?v=uxg5xK45g7E" [youtube] Setting language [youtube] 18: Downloading video webpage ERROR: Unable to download video webpage: HTTP Error 404: Not Found; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output.

Here's the verbose output
$ youtube-dl -F 18 "http://www.youtube.com/watch?v=uxg5xK45g7E" -v [debug] System config: [] [debug] User config: [] [debug] Command-line args: ['-F', '18', 'http://www.youtube.com/watch?v=uxg5xK45g7E', '-v'] [debug] youtube-dl version 2013.07.19 [debug] Python version 2.7.3 - Linux-3.2.0-31-virtual-x86_64-with-Ubuntu-12.04-precise [debug] Proxy map: {} [youtube] Setting language [youtube] 18: Downloading video webpage ERROR: Unable to download video webpage: HTTP Error 404: Not Found; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Traceback (most recent call last): File "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 416, in _real_extract video_webpage_bytes = compat_urllib_request.urlopen(request).read() File "/usr/lib/python2.7/urllib2.py", line 126, in urlopen return _opener.open(url, data, timeout) File "/usr/lib/python2.7/urllib2.py", line 406, in open response = meth(req, response) File "/usr/lib/python2.7/urllib2.py", line 519, in http_response 'http', request, response, code, msg, hdrs) File "/usr/lib/python2.7/urllib2.py", line 444, in error return self._call_chain(*args) File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain result = func(*args) File "/usr/lib/python2.7/urllib2.py", line 527, in http_error_default raise HTTPError(req.get_full_url(), code, msg, hdrs, fp) HTTPError: HTTP Error 404: Not Found Traceback (most recent call last): File "/usr/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 312, in extract_info ie_result = ie.extract(url) File "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 96, in extract return self._real_extract(url) File "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 418, in _real_extract raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err)) ExtractorError: Unable to download video webpage: HTTP Error 404: Not Found; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output.

[phihag]

-F lists all formats, so you instruct youtube-dl to list all formats on the URL 18. Instead, use

youtube-dl -f 18 "http://www.youtube.com/watch?v=uxg5xK45g7E" -v