我有一个关于youtube-dl库（https://rg3.github.io/youtube-dl/）的问题。我使用youtube-dl库不是直接下载视频，而是首先使用类似以下命令生成链接：
youtube-dl --simulate --dump-json --prefer-ffmpeg -- -CmadmM5cOk
注：--simulate参数表示模拟下载，--dump-json参数表示输出JSON格式的元数据，--prefer-ffmpeg参数表示优先使用FFmpeg进行转换。-CmadmM5cOk是视频的ID。
我从json回答中获得了所需的格式链接，我使用默认格式1280x720 mp4。链接看起来像这样 "https://r4---sn-nto52nx-px8e.googlevideo.com/videoplayback?lmt=1432339993780507&ip=x.x.x.x&key=yt6&fexp=9408710%2C9409069%2C9413137%2C9415365%2C9415485%2C9416023%2C9416126%2C941..."。
然后我使用这个链接从不同位置的不同电脑下载视频。对于大多数链接，它都可以正常工作，但有一些视频，例如https://www.youtube.com/watch?v=-CmadmM5cOk，我无法从不同的服务器或PC上下载，它返回ERROR 403：禁止访问。到目前为止，我已经尝试了以下方法，我有两台服务器和我的本地PC，它们分别位于不同的国家，美国、英国和乌克兰。
例如，我在美国的Server 1上运行youtube-dl并获取链接，我可以在该Server 1上下载它，但在伦敦的Server 2和乌克兰的本地PC上，它返回ERROR 403：禁止访问。
另一个例子，我在伦敦的Server 2上生成链接，我得到不同的链接，在同一台服务器上我可以下载它，但当我在Server 1或我的本地PC上尝试时，我得到相同的ERROR 403：禁止访问。当我在本地PC上生成链接并在服务器上尝试时也是如此。
这只发生在某些特定的视频上，但是有很多这样的视频。其中一些返回403的视频链接如下：https://www.youtube.com/watch?v=09R8_2nJtjg, https://www.youtube.com/watch?v=7PCkvCPvDXk。
谢谢，非常感谢您的帮助！
更新：
我正在尝试使用您建议的“-o -”选项将视频文件输出到标准输出，然后将其重新转换为用户。但是我又遇到了另一个问题，如果我使用ssh登录并尝试使用我的用户执行命令，它可以正常工作，但是当我在“www-data”用户下运行相同的命令时，它会抛出403错误。以下是详细报告：
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--prefer-ffmpeg', u'--no-warnings', u'-f', u'22', u'-o', u'-', u'-v', u'--', u'QcIy9NiNbmo']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.08.16.1
[debug] Python version 2.7.3 - Linux-4.1.0-x86_64-linode59-x86_64-with-debian-7.8
[debug] exe versions: avconv 0.8.17-6, avprobe 0.8.17-6, ffmpeg 0.8.17-6, ffprobe 0.8.17-6
[debug] Proxy map: {}
[youtube] QcIy9NiNbmo: Downloading webpage
[youtube] QcIy9NiNbmo: Downloading video info webpage
[youtube] QcIy9NiNbmo: Extracting video information
[youtube] {22} signature length 40.42, html5 player new
[youtube] {43} signature length 40.42, html5 player new
[youtube] {18} signature length 40.42, html5 player new
[youtube] {5} signature length 40.42, html5 player new
[youtube] {36} signature length 40.42, html5 player new
[youtube] {17} signature length 40.42, html5 player new
[youtube] {137} signature length 40.42, html5 player new
[youtube] {248} signature length 40.42, html5 player new
[youtube] {136} signature length 40.42, html5 player new
[youtube] {247} signature length 40.42, html5 player new
[youtube] {135} signature length 40.42, html5 player new
[youtube] {244} signature length 40.42, html5 player new
[youtube] {134} signature length 40.42, html5 player new
[youtube] {243} signature length 40.42, html5 player new
[youtube] {133} signature length 40.42, html5 player new
[youtube] {242} signature length 40.42, html5 player new
[youtube] {160} signature length 40.42, html5 player new
[youtube] {140} signature length 40.42, html5 player new
[youtube] {171} signature length 40.42, html5 player new
[youtube] QcIy9NiNbmo: Downloading DASH manifest
[debug] Invoking downloader on u'https://r6---sn-q4f7sn7s.googlevideo.com/videoplayback?dur=244.924&ipbits=0&sver=3&expire=1440076742&itag=22&lmt=1432153223392108&ratebypass=yes&fexp=9406010%2C9407118%2C9407156%2C9408710%2C9409069%2C9412515%2C9412774%2C9412779%2C9415365%2C9415485%2C9416023%2C9416126%2C9416326%2C9416916%2C9417707%2C9418153%2C9418449%2C9418954&key=yt5&mime=video%2Fmp4&initcwndbps=19078750&source=youtube&upn=H3j2i1TBZjA&mn=sn-q4f7sn7s&mm=31&pl=32&id=o-ADA7nHOi-VHvDpG35GbK7zvbnjmrppbPKN4PlVS25gcx&requiressl=yes&pcm2=no&ip=2600%3A3c00%3A%3Af03c%3A91ff%3Afe84%3A4cc7&mv=m&sparams=dur%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpcm2%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&mt=1440055050&ms=au&signature=FCB04C87410298BCDA619B8DB06221417292500B.669E8F187A5885C08D057F924A9551A657FF584B'
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1585, in process_info
success = dl(filename, info_dict)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1527, in dl
return fd.download(name, info)
File "/usr/local/bin/youtube-dl/youtube_dl/downloader/common.py", line 342, in download
return self.real_download(filename, info_dict)
File "/usr/local/bin/youtube-dl/youtube_dl/downloader/http.py", line 60, in real_download
data = self.ydl.urlopen(request)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1860, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "/usr/lib/python2.7/urllib2.py", line 407, in open
response = meth(req, response)
File "/usr/lib/python2.7/urllib2.py", line 520, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python2.7/urllib2.py", line 445, in error
return self._call_chain(*args)
File "/usr/lib/python2.7/urllib2.py", line 379, in _call_chain
result = func(*args)
File "/usr/lib/python2.7/urllib2.py", line 528, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 403: Forbidden
youtube-dl --rm-cache-dir即可解决该问题。 - Paul Rougieuxmp3='youtube-dl --rm-cache-dir && youtube-dl -x --audio-quality 0 --audio-format mp3 --no-playlist '。 - Philipp Gächter