Idea:
The basic idea is simple enough. You have to duplicate the output stream and redirect it to a file. This is done, as Maresh correctly pointed out, using the sout=#duplicate{...} directive.
Working Solution:
The following solution works on my machine ™. I've tested it on Ubuntu 12.10 with VLC v2.0.3 (TwoFlower) and Python 2.7.1. I think it should also work on Python 3 since most of the heavy lifting is done by libVlc anyway.
import os
import sys
import vlc
if __name__ == '__main__':
#filepath = <either-some-url-or-local-path>
movie = os.path.expanduser(filepath)
if 'http://' not in filepath:
if not os.access(movie, os.R_OK):
print ( 'Error: %s file is not readable' % movie )
sys.exit(1)
instance = vlc.Instance("--sout=#duplicate{dst=file{dst=example.mpg},dst=display}")
try:
media = instance.media_new(movie)
except NameError:
print ('NameError: % (%s vs Libvlc %s)' % (sys.exc_info()[1],
vlc.__version__, vlc.libvlc_get_version()))
sys.exit(1)
player = instance.media_player_new()
player.set_media(media)
player.play()
#dont exit!
while(1):
continue
Helpful Links
Update - Saving YouTube videos:
The above code doesn't play nice with YouTube. I searched around and discovered that an additional transcode directive can be used to convert YouTube's video stream to a regular video format. I used #transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128,deinterlace}
- vcodec=mp4v is the video format you want to encode in (mp4v is MPEG-4, mpgv is MPEG-1, and there is also h263, DIV1, DIV2, DIV3, I420, I422, I444, RV24, YUY2).
- acodec=mpga is the audio format you want to encode in (mpga is MPEG audio layer 2, a52 is A52 i.e. AC3 sound).
- vb=800 is the video bitrate in Kbit/s.
- ab=128 is the audio bitrate in Kbit/s.
- deinterlace tells VLC to deinterlace the video on the fly.
The updated code looks like this:
import os
import sys
import vlc
if __name__ == '__main__':
#filepath = <either-some-url-or-local-path>
filepath = "http://r1---sn-nfpnnjvh-1gil.c.youtube.com/videoplayback?source=youtube&newshard=yes&fexp=936100%2C906397%2C928201%2C929117%2C929123%2C929121%2C929915%2C929906%2C929907%2C929125%2C929127%2C925714%2C929917%2C929919%2C912512%2C912515%2C912521%2C906838%2C904485%2C906840%2C931913%2C904830%2C919373%2C933701%2C904122%2C932216%2C936303%2C909421%2C912711%2C907228%2C935000&sver=3&expire=1373237257&mt=1373214031&mv=m&ratebypass=yes&id=1907b7271247a714&ms=au&ipbits=48&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&itag=45&key=yt1&ip=2a02%3A120b%3Ac3c6%3A7190%3A6823%3Af2d%3A732c%3A3577&upn=z3zzcrvPC0U&cp=U0hWSFJOVV9KUUNONl9KSFlDOmt4Y3dEWFo3dDFu&signature=D6049FD7CD5FBD2CC6CD4D60411EE492AA0E9A77.5D0562CCF4E10A6CC53B62AAFFF6CB3BB0BA91C0"
movie = os.path.expanduser(filepath)
savedcopy = "yt-stream.mpg"
if 'http://' not in filepath:
if not os.access(movie, os.R_OK):
print ( 'Error: %s file is not readable' % movie )
sys.exit(1)
instance = vlc.Instance("--sout=#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128,deinterlace}:duplicate{dst=file{dst=%s},dst=display}" % savedcopy)
try:
media = instance.media_new(movie)
except NameError:
print ('NameError: % (%s vs Libvlc %s)' % (sys.exc_info()[1],
vlc.__version__, vlc.libvlc_get_version()))
sys.exit(1)
player = instance.media_player_new()
player.set_media(media)
player.play()
#dont exit!
while(1):
continue
A couple of important points:
I've used MPEG audio and video codecs in the transcode directive. It seems to be important to use a matching extensions for the output file (mpg in this case). Otherwise VLC gets confused when opening the saved file for playback. Keep that in mind if you decide to switch to another video format.
You cannot add a regular YouTube URL as filepath. Instead you have to specify the location of the video itself. That's the reason why the filepath that I've used looks so cryptic. That filepath corresponds to video at http://www.youtube.com/watch?v=GQe3JxJHpxQ. VLC itself is able to extract the video location from a given YouTube URL, but libVLC doesn't do that out of the box. You'll have to write your own resolver to do that. See this related SO question. I followed this approach to manually resolve the video location for my tests.
