<div class="gmail_quote">On Sun, Jul 4, 2010 at 11:42 AM, Andrey Nechypurenko <<a href="mailto:andreynech@googlemail.com">andreynech@googlemail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hi Folks, In my application I want to capture the output of the encoding pipeline for further processing. So my assumption was that using appsink would give me the same byte stream as the one stored in file with filesink. To be more concrete, I have the following pipeline: pipeline = GST_PIPELINE(gst_parse_launch ("videotestsrc ! " "video/x-raw-yuv,width=640,height=480,framerate=30/1 ! " "x264enc ! " "matroskamux ! " "appsink name=mysink", NULL)); then, after setting up the callback I just write the buffer into file: GstElement *mysink = gst_bin_get_by_name(GST_BIN(this->pipeline), "mysink"); g_object_set(G_OBJECT(mysink), "emit-signals", TRUE, "sync", FALSE, NULL); g_signal_connect(mysink, "new-buffer", G_CALLBACK (on_new_buffer), NULL); static void on_new_buffer(GstElement *element, void *data) { GstBuffer *buffer = gst_app_sink_pull_buffer(GST_APP_SINK(element)); fwrite(GST_BUFFER_DATA(buffer), GST_BUFFER_SIZE(buffer), 1, f); gst_buffer_unref(buffer); } To my surprise, the content of the file is not recognized as matroska container. The header (the beginning of the file) is indeed totally different from what I get if I execute the following command line: gst-launch videotestsrc ! video/x-raw-yuv,width=640,height=480,framerate=30/1 ! x264enc ! matroskamux ! filesink location=test.mka So my question is - am I right assuming that my application with appsink should produce correct mka file similar to the command line with filesink? </blockquote><div> </div><div>The problem here is that muxers usually have to seek back to rewrite some values it didn't know from the start to properly finish the file. Appsink doesn't provide a way to notify about this and filesink obviously handles it.</div> <div> </div><div>Checkout this bug for further info:</div><div><a href="https://bugzilla.gnome.org/show_bug.cgi?id=570619">https://bugzilla.gnome.org/show_bug.cgi?id=570619</a></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> If not, I would appreciate any suggestion or hints on how the pipeline should looks like to playback what is recorded by appsink in the scenario mentioned above. Thank you very much! Andrey. ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit <a href="http://sprint.com/first" target="_blank">sprint.com/first</a> -- <a href="http://p.sf.net/sfu/sprint-com-first" target="_blank">http://p.sf.net/sfu/sprint-com-first</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a 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