[vlc-devel] [RFC] VLC RTSP trickplay support

Derk-Jan Hartman hartman at videolan.org
Sat Feb 21 15:23:23 CET 2009

On 21 feb 2009, at 13:59, Rémi Denis-Courmont wrote:
>> At the moment VLC has no clue if the RTSP server supports "Scale"  
>> or not.
>> If it could then it would be possible to distinguish between RTSP  
>> servers
>> that do and those that do not support 'Scale'.
> That's a protocol problem. We have the exact same problem with  
> seeking.
> We cannot fix that with RTSP/1.0.

Seconded. This is a designchoice in the RTSP protocol. Everything is  
possible, but you are never guaranteed that anything should or will  
work. In hindsight it is one of the biggest problems with the entire  
RTSP protocol. Extensions to the protocol to query this information  
have been made, but are largely unsupported. RTSP 2.0 does solve this,  
but hardly anything supports RTSP 2.0 yet.


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