[gst-devel] Playing Mp3 help
basavaraj P
basavarajp82 at gmail.com
Thu Nov 19 14:47:10 CET 2009
Hello Jyoti,
I get following error
gst-launch -v filesrc location=Jab.mp3 ! id3demux ! flump3dec ! audioconvert
! audioresample ! autoaudiosink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal
data flow error.
Additional debug info:
gstbasesrc.c(2378): gst_base_src_loop ():
/GstPipeline:pipeline0/GstFileSrc:filesrc0:
streaming task paused, reason not-linked (-1)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
/GstPipeline:pipeline0/GstID3Demux:id3demux0.GstPad:src: caps = NULL
Freeing pipeline ...
Thanks,
Basavaraj
On Thu, Nov 19, 2009 at 4:36 PM, Jyoti <jyoti.d at allaboutif.com> wrote:
> Case 1:
> The below pipeline should play any mp3 file.
>
> gst-launch -v filesrc location=song.mp3 ! mad ! audioconvert !
> audioresample ! autoaudiosink
>
> Case 2:
> And optionally if the file has id3 tags then use
>
> gst-launch -v filesrc location=song.mp3 ! id3demux ! mad ! audioconvert !
> audioresample ! autoaudiosink
>
> You need to additional install mad(mp3 decoder).
>
> Only in case 2 you need to have the callback for "pad-added" signal. Check
> out the helloworld example and similar
> from manual.
>
>
>
> On Thu, Nov 19, 2009 at 4:14 PM, Lukas Ruetz <lukas.ruetz at gmx.at> wrote:
>
>> Hi,
>>
>> Am Donnerstag, den 19.11.2009, 07:41 -0200 schrieb Tiago Katcipis:
>> > It would be easier if you show your on_pad_added function, and if you
>> > tell exactly what error messages do you get when you run your
>> > application.
>> >
>> > To investigate the capabilities of a element you can use gst-inspect.
>> >
>> > On a terminal you can type for example:
>> > gst-inspect flump3dec
>> >
>> > it will give an complete specification of the flump3dec element.
>> >
>> > best regards,
>> > Katcipis
>> >
>> > On Thu, Nov 19, 2009 at 6:40 AM, basavaraj P <basavarajp82 at gmail.com>
>> > wrote:
>> > Hello,
>> >
>> > Following is code which plays mp3 using playbin
>> >
>> > /* set up */
>> > play = gst_element_factory_make ("playbin2", "play");
>> > g_object_set (G_OBJECT (play), "uri",
>> > "file:///home/basavaraj/Music/JabSeTereNaina.mp3", NULL);
>> >
>> > bus = gst_pipeline_get_bus (GST_PIPELINE (play));
>> > // gst_bus_add_watch (bus, my_bus_callback, loop);
>> > gst_object_unref (bus);
>> >
>> > gst_element_set_state (play, GST_STATE_PLAYING);
>> >
>> >
>> > Following is code which does not play mp3. Please help me what
>> > all plugins we need to connect and
>> > how to find their capabilities
>> >
>> > /* Create gstreamer elements */
>> > GstElement* pipeline = gst_pipeline_new ("audio-player");
>> > GstElement* source = gst_element_factory_make ("filesrc",
>> > "file-source");
>> > GstElement* demuxer = gst_element_factory_make
>> > ("mpegdemux2", "mpeg-demuxer");
>> > GstElement* decoder = gst_element_factory_make
>> > ("flump3dec", "fluendo-decoder");
>> > // GstElement* decoder =
>> > gst_element_factory_make("decodebin", "decoderbin");
>> > GstElement* conv = gst_element_factory_make
>> > ("audioconvert", "converter");
>> > GstElement* sink = gst_element_factory_make
>> > ("autoaudiosink", "audio-output");
>> >
>> > if (!pipeline || !source || !demuxer || !decoder || !conv
>> > || !sink) {
>> > g_printerr ("One element could not be created.
>> > Exiting.\n");
>> > return -1;
>> > }
>> >
>> > /* Set up the pipeline */
>> >
>> > /* we set the input filename to the source element */
>> > // g_object_set (G_OBJECT (source), "uri",
>> > "file:///home/basavaraj/Music/Jab.mp3", NULL);
>> > g_object_set (G_OBJECT (source), "location",
>> > "/home/basavaraj/Music/Jab.mp3", NULL);
>> >
>> > /* we add a message handler */
>> > GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE
>> > (pipeline));
>> > gst_bus_add_watch (bus, bus_call, loop);
>> > gst_object_unref (bus);
>> >
>> > /* we add all elements into the pipeline */
>> > /* file-source | mp3-demuxer | mp3-decoder | converter |
>> > alsa-output */
>> > gst_bin_add_many (GST_BIN (pipeline),
>> > source, demuxer, decoder, conv, sink,
>> > NULL);
>> >
>> > /* we link the elements together */
>> > /* file-source -> mp3-demuxer ~> mp3-decoder -> converter ->
>> > alsa-output */
>> > gst_element_link (source, demuxer);
>> > g_signal_connect (demuxer, "pad-added", G_CALLBACK
>> > (on_pad_added), decoder);
>> >
>> > /* Set the pipeline to "playing" state*/
>> > g_print ("Now playing: %s\n", argv[1]);
>> > gst_element_set_state (pipeline, GST_STATE_PLAYING);
>> >
>> >
>> > Thanks in advance,
>> > Basavaraj
>>
>>
>> Try this pipeline to play mp3s. Because it's audio-only (beside
>> mp3-tags) you don't need a demuxer.
>>
>> gst-launch-0.10 -v filesrc location=song.mp3 ! mp3parse ! flump3dec !
>> audioconvert ! audioresample ! autoaudiosink
>>
>> hth,
>> lukas
>>
>>
>>
>>
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