Re: [Redbutton-devel] Small changes to rb for Fedora 9

[Andrea <mar...@go...>]

Simon Kilvington wrote:
> not sure why the audio does not play in News Multiscreen - it works for
> me - the error you get seems to suggest it is trying to open an audio
> stream that does not exist - if you run rb-browser with the -v flag and
> send me a log of the output, I'll see if I can work out what is going
> wrong

will try that.

> xvideo output - this has been on my todo list for a long time - if you
> want to implement it I would be very pleased ;-) you should be able to
> base the code on videoout_xshm - I've been thinking it may be better to
> also have a function in the videoout_* codes to overlay the MHEG scene
> on the video - if we can feed YUV frames to xvideo rather than having to
> convert them to RGB first, then it may turn out better to convert the
> MHEG scene to YUV and composite that on the YUV video then feed the
> result to xvideo - the scene will change a lot less often than the video
> so there should be a lot less RGB->YUV conversion going on

I have understood a little how videoout_xshm works, comparing it to _null.
A you mention below, I still have to understand how the overlay of the MHEG over the video works.

> so we would basically have a function in videoout_* called something
> like "set_overlay" that gets called each time the MHEG scene changes -
> then each time we show a video frame we composite the current overlay
> on to it
> 

need to think more about that but thanks for the hints.

A couple of other points:

1) sometimes the rb-download is not fast enough to read from dvr and it gets an overflow. you might 
try to set the DMX_SET_BUFFER_SIZE which (from 2.6.26) works for the dvr too. One could always open 
the dvr and set a bigger buffer (default is just less than 2 MB)

2) why not use a video engine like xine? I should be possible to add overlay, more or less in the 
same way as subtitles are added to the video. what do you think?

Thanks

Andrea