Question

尝试使用大写创建过滤器：

GMainLoop *loop; 
            GstElement *pipeline, *source, *demuxer, *decoder,  *typefind, *conv, *sink;; 
            GstBus *bus; 
            guint bus_watch_id; 


            loop = g_main_loop_new(NULL, FALSE); 

            pipeline = gst_pipeline_new ("audio-player"); 
            source   = gst_element_factory_make ("filesrc",       "file-source"); 
            typefind = gst_element_factory_make ("typefind", "typefinder"); 
            demuxer  = gst_element_factory_make ("oggdemux",      "ogg-demuxer"); 
            decoder  = gst_element_factory_make ("vorbisdec",     "vorbis-decoder"); 
            conv     = gst_element_factory_make ("audioconvert",  "converter"); 
            sink     = gst_element_factory_make ("autoaudiosink", "audio-output"); 

            if (!pipeline || !source || !demuxer || !decoder || !conv || !sink) { 
                    return -1; 
            } 
            g_signal_connect (typefind, "have-type", G_CALLBACK (cb_typefound), loop); 
            g_object_set(G_OBJECT(source), "location", name_of_file, NULL); 

            bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline)); 
            bus_watch_id = gst_bus_add_watch(bus, bus_call, loop); 
            gst_object_unref(bus); 

            gst_bin_add_many(GST_BIN(pipeline), source, typefind, demuxer, decoder, conv, sink, NULL); 

            GstCaps *my_caps = gst_caps_new_simple ("audio/x-raw","rate", G_TYPE_INT, 384,NULL); 


            gboolean test=false; 
            test = gst_element_link_filtered(source,typefind, my_caps); 
            test = gst_element_link(typefind, demuxer); 
            test = gst_element_link_many(decoder, conv,sink, NULL); 


            g_signal_connect(demuxer, "pad-added", G_CALLBACK(on_pad_added), decoder); 
......

调试：gsttypefindelement.c（1169）：gst_type_find_element_loop（）：/ GstPipeline：a UDIO播放/ GstTypeFindElement：typefinder：流已停止，原因未链接

  在pst_element_link_filtered之后
Var test == 1（source，typefind，   my_caps）;

在gst_element_link之后测试== 0（typefind，demuxer）;

在gst_element_link_many（decode，conv，sink，NULL）之后测试== 1;

如果我只是在gst_element_link上更改gst_element_link_filtered，一切正常，文件播放。我究竟做错了什么？

Answer 1

您似乎也将此帖子发布到gst-devel邮件列表中，并在那里得到回复：

http://gstreamer-devel.966125.n4.nabble.com/GstCaps-filter-issue-td4672796.html

当您似乎想要播放OGG文件时，在filesrc和demuxer之间设置原始音频的过滤器上限是错误的。你应该更好地解释你想做什么，以便我们提供更精确的指导。

GstCaps过滤问题

1 个答案: