Gstreamer Cannot Adjust Volume of Pipeline while playing, Cannot Seek to time, Cannot Query Duration

Question

I am using Gstreamer through C++. I am trying to play raw pcm buffer using rawaudioparse. Although I can play it, I Cannot Adjust Volume of Pipeline while playing, Cannot Seek to time, Cannot Query Duration.

THis is the code I tried.

    pipeline = gst_parse_launch("appsrc name=src ! rawaudioparse format=pcm num-channels=1 sample-rate=44100 pcm-format=GST_AUDIO_FORMAT_S32LE ! volume name=vol ! audioconvert ! audioresample ! autoaudiosink --gst-debug=2", NULL);

    GstElement* appsrc = gst_bin_get_by_name(GST_BIN(pipeline), "src");
    GstStreamVolume* volume = (GstStreamVolume*)gst_bin_get_by_name(GST_BIN(pipeline), "vol");

(buf = ..., bufsize = ...)


    GstBuffer* buffer = gst_buffer_new_allocate(NULL, bufsize, NULL);

    gst_buffer_fill(buffer, 0, buf, bufsize);

    gst_app_src_push_buffer(GST_APP_SRC(appsrc), buffer);
    gst_app_src_end_of_stream(GST_APP_SRC(appsrc));

    gst_element_set_state(pipeline, GST_STATE_PLAYING);

When I try to seek gst_element_seek_simple(pipeline, GST_FORMAT_TIME, GstSeekFlags(GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT), 10 * GST_MSECOND); IT FAILS, NO SEEKING IS PERFORMED

When I try to set volume gst_stream_volume_set_volume((GstStreamVolume*)pipeline, GST_STREAM_VOLUME_FORMAT_CUBIC, volumelevel); The volume doesn't change.

When I try to query the duration, the duration yields -1

    gint64 duration;
    gst_element_query_duration(pipeline, GST_FORMAT_TIME, &duration);
    std::cout << "Duration: " << duration << std::endl;

Answer 1

the source appsrc is set to live by default. Change source property using stream-type=GST_APP_STREAM_TYPE_SEEKABLE to perform the seek operation. Also implement seek in application