<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=windows-1252" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Hello Thiago Thanks for your suggestions. I read the playbin2 docs, and it said that I could use the fakesink's handoff signal to grab the buffer from the playbin2 video. I tried to set that up, but my signal handler never gets called. Here is the code snippet that I have: static void cb_handoff (GstElement *fakesink, GstBuffer *buffer, GstPad *pad, gpointer user_data) { static gboolean white = FALSE; /* this makes the image black/white */ printf("new buffer is happening\n"); } .... Initlization function stuff .... videosink = gst_element_factory_make ("fakesink", "videosink"); g_object_set (G_OBJECT (videosink), "signal-handoffs", TRUE, NULL); g_signal_connect (videosink, "handoff", G_CALLBACK (cb_handoff), NULL); gs_data->pipeline = gst_element_factory_make ("playbin2", "my-player"); g_object_set (G_OBJECT (gs_data->pipeline), "video-sink", videosink, NULL); g_object_set (G_OBJECT (gs_data->pipeline), "uri", "<path_to_mp4>", NULL); This plays the sound from the mp4, but I can't grab the buffer. Am I missing a step? Do I have to setup a video-bin, with a filter, converter, and sink? Thanks, Rodney On 10-05-31 11:40 PM, <a class="moz-txt-link-abbreviated" href="mailto:thiagossantos@gmail.com">thiagossantos@gmail.com</a> wrote: <blockquote cite="mid:AANLkTinXRiwvDfLkyNngT243A2RVfEvO31i_on5eDVvk@mail.gmail.com" type="cite"> <div class="gmail_quote">On Mon, May 31, 2010 at 11:53 PM, Rodney Dowdall <<a moz-do-not-send="true" href="mailto:rdowdall@cranksoftware.com">rdowdall@cranksoftware.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div bgcolor="#ffffff" text="#000000">Hello I am trying to play the audio and the video from a mp4 file. If I run the following line: gst-launch -vvvvv --gst-debug-level=2 playbin uri=<a moz-do-not-send="true">file:///</a><path_to_mp4_file> Then it plays the file's audio. I'm not putting the video anywhere, so I can't see if it is playing or not, but I assume it is based on the debug output. If I do the following line: gst-launch -vvv --gst-debug-level=2 filesrc location=<path_to_mp4_file> ! decodebin2 name=decoder decoder. ! audioconvert ! audioresample ! osssink decoder. ! ffmpegcolorspace ! xvimagesink It hangs at: Setting pipeline to PAUSED .. /GstPipeline:pipeline0/GstDecodeBin2:decoder/GstTypeFindElement:typefind.GstPad:src: caps = audio/x-m4a Pipeline is PREROLLING ... <audio debug output snipped> </div> </blockquote> <div> You need to put 'queue' after each decodebin2's branch to start a new thread for them. The docs should have some more information about this: <a moz-do-not-send="true" href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html#section-threads-uses">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html#section-threads-uses</a> </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div bgcolor="#ffffff" text="#000000"> I need to open this file in C code, and grab access to the buffers. I was planning on using appsink to do it, but any time I pass in a video sink to the pipeline, it just hangs, never playing the audio, or moving forward. As I said, I need access to the video buffer, so either I need a way to grab it from the pipeline created from gst_parse_launch, or I was thinking that if I set up the pipeline myself, I could use a handoff signal on the last video sink, or mayber use the appsink methods. </div> </blockquote> <div> FYI, you can set the video-sink property in playbin2 to your appsink and get the buffers from there. </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div bgcolor="#ffffff" text="#000000"> I have a feeling that I am missing something simple, and was hoping someone could point that out. Thanks, Rodney <div>-- Rodney Dowdall Crank Software Inc. Office: 613-595-1999 Online: <a moz-do-not-send="true" href="http://www.cranksoftware.com/" target="_blank">www.cranksoftware.com</a> Check out: <a moz-do-not-send="true" href="http://cranksoftware.com/blog/" target="_blank">Crank Software’s Blog</a> </div> </div> ------------------------------------------------------------------------------ _______________________________________________ gstreamer-devel mailing list <a moz-do-not-send="true" href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a moz-do-not-send="true" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote> </div> -- Thiago Sousa Santos </blockquote> <div class="moz-signature">-- <meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252"> <title></title> <meta name="GENERATOR" content="OpenOffice.org 3.2 (Unix)"> <meta name="AUTHOR" content="Rodney Dowdall"> <meta name="CREATED" content="20100531;22163400"> <meta name="CHANGEDBY" content="Rodney Dowdall"> <meta name="CHANGED" content="20100531;22324000"> <style type="text/css">  </style> Rodney Dowdall Crank Software Inc. Office: 613-595-1999 Online: <a href="http://www.cranksoftware.com/">www.cranksoftware.com</a> Check out: <a href="http://cranksoftware.com/blog/">Crank Software’s Blog</a> </div> </body> </html>