On Tue 10 Aug 2010 at 06:24:06 PM +0200, Stefano Sabatini wrote: >On date Monday 2010-08-09 18:34:49 -0700, George Georgalis encoded: >> Hi all - >> >> new to this list but I used mplayer back in '03 for kiosks development >> >> today I'm trying to use two avfilters, overlay and drawtext, but >> it doesn't seem I can use both at once. will I need to encode >> the video twice, once for each filter? > >Yes, this is a known limitation that we should be able to remove: >https://roundup.ffmpeg.org/issue2040
that seems like a slightly different issue for me. not knowing the internal details, I'm just guessing here, but if there are multiple avfilters request isn't it a matter of pipelining the data stream through sequential avfilter calls? I don't see the need to generate multiple output descriptors? But along that vein, the multitee might be a useful library for creating multiple outputs http://code.dogmap.org/fdtools/multitee/ http://cr.yp.to/software/multitee-3.0.shar.gz >> also, was wondering if there is a way to draw scrolling text, like >> a marquee along the bottom of video? > >Well you know, patches are welcome... I was thinking about a convoluted invocation that used the drawtext filter with different positional parameters for each frame. but I'm kinda assuming this would require huge cpu recourses and/or generate enormous output file sizes (invoking ffmpeg once for each frame). Clearly the better way is to add a function that makes the positional parameters depend on the frame count. ...a bit outside of what I am allowed to spend my time on... -George _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
