[Live-devel] Subtitle

[Morgan Tørvolt]

What about making an index file? If there exists a file with the same
file name as the TS file with .index or something at the end, it could
contain information on where the I frames are placed int the
transportstream. Would that be an idea? Would need a program to
generate the .index file though.

-Ko_deZ-

On 7/15/05, Ross Finlayson <finlayson at live.com> wrote:
> 
> >What about trick play? After what I can see, pause, ffwd, rwd and such
> >does not work well with transport stream.
> 
> RTSP "PAUSE" works OK with all media types, including MPEG Transport
> Streams.  (However, as I noted in my earlier message, VLC currently doesn't
> implement PAUSE correctly.)  The Amino set-top box, however, will send a
> RTSP "PAUSE" (and the stream stops playing) if the user presses the 'pause'
> button on the remote control.
> 
> Seeking (by time) within a MPEG Transport Stream is something that could
> probably be implemented fairly easily.
> 
> However, fast forward and reverse play are much more
> difficult.  Implementation of this involves (i) extracting the video
> program from the Transport Stream; (ii) extracting I-frames from the video
> program (because if you're playing only selected video frames - for fast
> forward - then they must be all I-frames); (iii) chosing which I-frames to
> display, to give you the desired speed;  (iv) reassembling the chosen
> I-frames into a new (video-only) Transport Stream; and (v) streaming the
> new Transport Stream (with correct timing).
> 
> It turns out that (after a *lot* of effort), I was able to implement RTSP
> fast forward and reverse play on Transport Streams - as described above -
> for a customer's project.  However, this was custom, proprietary code,
> which will probably not get included in the public "LIVE.COM Streaming
> Media" source code release anytime in the near future.
> 
> 
>         Ross Finlayson
>         LIVE.COM
>         <http://www.live.com/>
> 
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