<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40"> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <style>  </style> </head> <body lang=FR link=blue vlink=purple> <div class=Section1> Hello all,<o:p></o:p> <o:p> </o:p> We are developing a PCI-express board for accelerating JPEG2000 encoding and decoding.<o:p></o:p> We also provide a lot of software applications with our board (streaming server/client, ingest software, players, transcoders, archiving software…).  <o:p></o:p> <o:p> </o:p> A lot of features we plan to create (or have already created) in our software do already exist in gstreamer. We do not like the idea of reinventing the wheel and we are now thinking about designing a gstreamer plugin for our HW codecs to be able to use all the wonderful gstreamer plugins.<o:p></o:p> <o:p> </o:p> Since I am new to gstreamer (just read the general doc and plugin writing guide), before making that switch I would like to ask your advices about complexity of what we would like to develop:<o:p></o:p> <o:p> </o:p> The product we would like to build is a player GUI for jpeg2000 media (using our hardware jpeg2000 decoder pciexpress board): <o:p></o:p> <o:p> </o:p> The media types we would like to support: <o:p></o:p> -           1 Sequence of jpeg2000 (RGB or YCbCr) files (multifilesrc), with a wav audio track (filesrc)<o:p></o:p> -           2 sequences of jpeg2000 files (2 x multifilesrc) for 3D movies, with a wav audio track (filesrc)<o:p></o:p> -           Two Mxfs files (one for video with embedded Jpeg2000 frames, and another one with audio)<o:p></o:p> <o:p> </o:p> The type of “pipelines” we would need: <o:p></o:p> -           Audio played on autoaudiosink in sync with video played on autovideosink<o:p></o:p> -           Audio played on autoaudiosink in sync with video played on external video interface of our board (SDI)<o:p></o:p> -           Audio and Video played on external audio/video interface of our board<o:p></o:p> <o:p> </o:p> The features the gui will have:<o:p></o:p> -           Playing/pausing/stopping/seeking the content<o:p></o:p> (and unrelated to gstreamer:<o:p></o:p> -           Browsing filesystem for content <o:p></o:p> -           Manage/save playlists)<o:p></o:p> <o:p> </o:p> Our “clock concern”:<o:p></o:p> -           Our board do have an SDI interface. We would like to be able for the board to be a “clock provider” when used with this video interface.  <o:p></o:p> -           If we use alsasink and our board with video output interface, we would still like alsasink to be chosen as clock and have a mechanism in our board library to drop/repeat frames to compensate drift between alsa clock and our board’s clock.<o:p></o:p> <o:p> </o:p> My questions:<o:p></o:p> -           Since our board can act as a “decoder-only” and as a “decoder+sdi video sink”, I guess I should have two elements in my plugin: “myjpeg2000decoder and myjpeg2000sdisink” ? "myjpeg2000sdisink" would need to support up to two input pads (for playing 3D content). Is this the right way to do it?<o:p></o:p> <o:p> </o:p> -           Is this easy for gstreamer to keep my audio/video in sync when using “unrelated” sources (multifilesrc +wav filesrc  , audiomxf+videomxf, … instead of the a typical source with one avi file containing audio and video)? What could happen to this sync if a “seek” is applied on the pipeline? <o:p></o:p> <o:p> </o:p> -           Since the movie player TOTEM uses GStreamer and it has the basic features we need (seek, playlist), is there a way to make it run our pipelines? I guess it would be possible if playbin was aware of how to play our content ?<o:p></o:p> <o:p> </o:p> -           About performances of “autovideosink”: do I have a chance of being able to play in realtime 1920x1080 @ 30 fps (RGB24 or YUYV) on any of the videosink provided with gstreamer (a quick test gst-launch videotestsrc ! autovideosink in 1920x1080 is not realtime on my i7 with 6gigs RAM on Ubuntu10.04)? <o:p></o:p> <o:p> </o:p> -           Any idea, suggestion or other thing you think I should take into account?<o:p></o:p> <o:p> </o:p> -           What about the complexity of the whole work ?<o:p></o:p> <o:p> </o:p> Many thanks in advance for paying attention to this rather big email. I would be glad to start using gstreamer :-).<o:p></o:p> <o:p> </o:p> Best regards,<o:p></o:p> <o:p> </o:p> <o:p> </o:p> Charles Buysschaert<o:p></o:p> IntoPIX S.A<o:p></o:p> <o:p> </o:p> <o:p> </o:p> </div> </body> </html>