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POHaskell GStreamer tee element(1-N) trouble
 

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  1. POHaskell GStreamer tee element(1-N) trouble
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    <p><strong>The problem i have relates to the following piece of code:</strong></p> <pre><code>module Main(main) where import qualified Media.Streaming.GStreamer as GS import Data.Maybe import System.IO import System.Exit import System.Glib.MainLoop as Glib import System.Glib.Signals as Glib import System.Glib.Properties as Glib makeElement:: String → String → IO GS.Element makeElement elementType elementName = do element ← GS.elementFactoryMake elementType (Just elementName) case element of Just element' → return element' Nothing → do hPutStrLn stdout ("Cannot create element!") hFlush stdout exitFailure player = do GS.init pipeline ← GS.pipelineNew "video-stream" source ← makeElement "v4l2src" "video-source" color ← makeElement "ffmpegcolorspace" "video-color" tee ← makeElement "tee" "stream-tee" rQ ← makeElement "queue" "record-queue" vQ ← makeElement "queue" "video-queue" encoder ← makeElement "y4menc" "video-encoder" rSink ← makeElement "filesink" "record-sink" sink ← makeElement "ximagesink" "video-sink" let elements = [source,color,encoder,rSink,vQ,rQ,sink,tee] Glib.objectSetPropertyString "location" rSink "rec" mapM_ (GS.binAdd (GS.castToBin pipeline)) elements -- Request Pads from tee dPad ← GS.elementGetRequestPad tee "src%d" rPad ← GS.elementGetRequestPad tee "src%d" -- Request Static Pads from queue sDPad ← GS.elementGetStaticPad vQ "sink" sRPad ← GS.elementGetStaticPad rQ "sink" -- Link tee source to queue sink GS.padLink (fromJust dPad) (fromJust sDPad) GS.padLink (fromJust rPad) (fromJust sRPad) GS.elementReleaseRequestPad tee $ fromJust dPad GS.elementReleaseRequestPad tee $ fromJust rPad GS.elementLink source color GS.elementLink color tee GS.elementLink vQ sink GS.elementLink rQ encoder GS.elementLink encoder rSink GS.elementSetState pipeline GS.StatePlaying main = do loop ← Glib.mainLoopNew Nothing False player Glib.mainLoopRun loop </code></pre> <p>The code compiles fine, camera LED switches ON and the file is created but then NOTHING. Without the tee and queue elements, the separate setup for recording/displaying video works just fine.Also, the same pipeline works perfectly if i test it with gst-launch. I'm missing something here on how gstreamer works but i can't figure out what.</p> <p>Also, if it helps, i'm building on ArchLinux using: <br> - GHC 7.0.3 ; <br> - gstreamer-bindings 0.12.1 ; <br> - gtk2hs 0.12.2 ; <br> - gstreamer 0.10.35-1 ; <br> - glib 1.2.10-9 .</p>
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    1. COYou should add your discoveries as an answer and accept that answer. It's not considered rude to answer your own question here -- if you happened to be the first one to discover what was wrong, more power to you!
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