[colug-432] Streaming

[Thomas W. cranston]

On 01/10/2011 08:45 AM, Richard Troth wrote:
> I don't know the full history of /proc throughout all Unixdom.  My
> first exposure to it was on Solaris (Sun).  Also saw it on IRIX (SGI).
>   Linux has had it for a very long time, maybe prior to 1.0.  (I used
> 0.99, but I don't remember if /proc was present.)
>
> The implication from its name is that it holds PROCess information.
> So there is a sub-directory for each running process.  A normal Linux
> system will always have process #1 (INIT), so you can eyeball the
> contents of /proc/1 and see how things look.  (INIT is a simple case,
> so /proc/1 won't necessarily have as much interesting stuff as other
> pseudo directories under /proc.)
>
> (forgive me if you know this)   The<PID>  nomenclature was simply a
> shortcut for "any process number".  So ... find out the process ID of
> your running media player (eg: when you are at the library).  Say it
> is 1234.  Then /proc/<PID>/fd would be /proc/1234/fd, which is a
> pseudo directory of the file descriptors of that process.  ONE of
> those file descriptors should reveal a temporary file where the
> content is cached.
>
> Linux is pretty slick here.  Other POSIX systems and Unix-workalike
> systems don't have as much magic exposed under /proc (and now also
> /sys).
>
> I hope this helps.
>
> -- R;<><
>
>
>
>
>
> On Mon, Jan 10, 2011 at 09:29, Thomas W. cranston
> <cranston.thomas at gmail.com>  wrote:
>    
>> On 01/09/2011 04:56 PM, William Yang wrote:
>>      
>>> On Sat, 2011-01-08 at 18:25 -0500, Matt Meinwald wrote:
>>>
>>>        
>>>> My guess is it is not on the hard drive at all.  I have seen flash store regular
>>>> videos in /tmp.  In more recent versions they seem to be deleting this file
>>>> immediately after creating it, but it is still accessible somewhere in
>>>> /proc/<PID>/fd/.
>>>>
>>>>          
>>> That's a secure coding technique to prevent data leakage.
>>>
>>>
>>>
>>>
>>>
>>>
>>>        
>>>> I attempted to use the same strategy for a streamed video, but the only related
>>>> file in there is a socket connection to port 1935, apparently the port for RTMP
>>>> (http://en.wikipedia.org/wiki/Real_Time_Messaging_Protocol).  If you are really
>>>> serious about downloading these streams, it seems you would need to find the url
>>>> of the stream and a program that can handle RTMP (some can be found in the link
>>>> I provided).
>>>>
>>>> On 01/08/2011 06:10 PM, jep200404 at columbus.rr.com wrote:
>>>>
>>>>          
>>>>> Hi,
>>>>>
>>>>> You wrote:
>>>>>
>>>>>
>>>>>            
>>>>>> I streamed ACL 1/1/11 (Cheap Trick) this week at the Library. It does
>>>>>> not show up in tmp. Any idea where they hide it?
>>>>>>
>>>>>>              
>>>>> Nope. I do not even know if it is on your hard drive.
>>>>>
>>>>>
>>>>>            
>>>>>> Does streaming work different than downloading a You Tube video?
>>>>>>
>>>>>>              
>>>>> I do not know.
>>>>>
>>>>>
>>>>>            
>>>>>> Where does Austin City Limits hide their stream in my computer?
>>>>>>
>>>>>>              
>>>>> Flash considers users to be the scum of the earth.
>>>>> I expect that PBS (not Austin City Limits) has decided
>>>>> to make saving the stream difficult. Search for flash in
>>>>> add-ons for Mozilla/IceWeasel. Try the different downloaders.
>>>>>
>>>>> Here's something to try.
>>>>>
>>>>> Before going to the web site for the video, execute:
>>>>>
>>>>>      man find
>>>>>      find />before.files
>>>>>
>>>>> As you are watching the video, execute:
>>>>>
>>>>>      find />while.files
>>>>>
>>>>> The compare them:
>>>>>
>>>>>      man diff
>>>>>      diff before.files while.files | less
>>>>>
>>>>> Jim
>>>>>
>>>>> _______________________________________________
>>>>> colug-432 mailing list
>>>>> colug-432 at colug.net
>>>>> http://lists.colug.net/mailman/listinfo/colug-432
>>>>>
>>>>>            
>>>> _______________________________________________
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>>>>
>>>>          
>>>        
>> What is /<PID>  , or what does it mean? Process ID? Does that mean I
>> should look in /proc/1 thru /proc/tty?
>>
>> tom at 1520:~$ cd /proc/<PID>/fd/
>> bash: PID: No such file or directory
>> tom at 1520:~$ cd /proc/<PID>/
>> bash: PID: No such file or directory
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>>      
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>    
That helps. Will try it and other suggestions next time I am at a fast 
connection.

Tom