http streaming fails if content-length is large

[M8R-3w06bx@…]

when streaming video from http with

mplayer -prefer-ipv4 -cache 4096 ​http://some.url

mplayer seems to try to seek forward near to
the end of the video

if the content-length is a large nonsensical value
then mplayer cannot handle it

the result is that

mplayer -prefer-ipv4 -cache 4096 ​http://some.url
mplayer -cache 4096 ffmpeg://http://some.url

does not work, but

wget -O- ​http://some.url |mplayer -cache 4096 -

works, since in this later case mplayer does
not try to do the forward seek

i found this with a livestreaming url
from youtube, the headers are:

HTTP/1.1 200 OK
Last-Modified: Wed, 02 May 2007 10:26:10 GMT
Content-Type: video/x-flv
Date: Tue, 10 May 2011 20:13:50 GMT
Expires: Tue, 10 May 2011 20:13:51 GMT
Cache-Control: public, max-age=1
Accept-Ranges: bytes
Content-Length: 2147483646
Connection: close
X-Content-Type-Options: nosniff
Server: gvls 2.0

(got the particular url by

wget -O- ​http://youtu.be/RhmWg7Lp0i0 |sed 's/, /\n/g' |grep '^{"fmt_stream_map'}

and then some more hacking..)

[M8R-3w06bx@…]

mplayer logs

[M8R-3w06bx@…]

mplayer logs when ffmpeg:// was used