GStreamer

giritharanr — Wed, 20 May 2015 14:46:50 GMT

Hi i wrote GStreamer C application for my following working GStreamer command to record video with audio

gst-launch –e mfw_v4lsrc capture-mode=1 fps-n=30 ! vpuenc codec=0 ! queue ! mux. alsasrc ! 'audio/x-raw-int,rate=48000,channels=1' ! mfw_mp3encoder ! queue ! mux. avimux name=mux ! filesink location=audio_video.avi sync=false.

This is my main code.The following code records only video.But audio is not capturing.Where i did wrong.Please kindly correct my mistake.

int

main (int argc,

char *argv[])

{

GMainLoop *loop;

GstElement *pipeline,*video_source, *video_encoder, *video_queue,*audio_source,*audio_encoder,*audio_queue,*audio_muxer, *sink, *filter;

//GstElement *pipeline, *source, *encoder, *sink;

GstBus *bus;

guint bus_watch_id;

//GstCaps *caps = gst_caps_new_empty();

gst_init (&argc, &argv);

GstCaps *audio_caps;

loop = g_main_loop_new (NULL, FALSE);

if(argc !=2)

{

g_printerr ("Usage: %s <Ogg/Vorbis filename>\n", argv[0]);

return -1;

}

/* Pipeline create */

pipeline = gst_pipeline_new("pipeline");

/*video source */

video_source = gst_element_factory_make("mfw_v4lsrc", "video_source");

/*codec encoder */

video_encoder = gst_element_factory_make("vpuenc", "video_encoder");

/*queue for video */

video_queue = gst_element_factory_make("queue", "video_queue");

/*audio source */

audio_source = gst_element_factory_make("alsasrc","audio_source");

filter = gst_element_factory_make("capsfilter", "filter");

/*audio encoder */

audio_encoder = gst_element_factory_make("mfw_mp3encoder", "audio_encoder");

/*audio queue */

audio_queue = gst_element_factory_make("queue", "audio_queue");

/*muxer*/

audio_muxer = gst_element_factory_make("avimux","audio_muxer");

sink = gst_element_factory_make("filesink", "sink");

g_object_set (G_OBJECT (sink), "location",argv[1], NULL);

g_object_set(G_OBJECT (sink),"sync",FALSE,NULL);

audio_caps = gst_caps_new_simple("audio/x-raw-int",

"rate", G_TYPE_INT,44100,

"channels",G_TYPE_INT,1,

NULL);

g_object_set (G_OBJECT (filter), "caps", audio_caps, NULL);

g_object_set (G_OBJECT (video_source), "capture-mode", 1, NULL);

g_object_set (G_OBJECT (video_source), "fps-n", 30, NULL);

g_object_set (G_OBJECT (video_encoder),"codec", 0 , NULL);

g_object_set (G_OBJECT (sink), "location",argv[1], NULL);

g_object_set(G_OBJECT (sink),"sync",FALSE,NULL);

if(!pipeline || !video_source || !video_encoder || !video_queue

|| !audio_source || !audio_encoder || !audio_muxer

|| !filter || !sink) {

g_printerr ("One element could not be created. Exiting.\n");

return -1;

}

printf("Creating watcher bus ID *************************************************************************************************************\n");

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), video_source, video_encoder, video_queue,audio_source,audio_encoder,audio_queue,audio_muxer,sink,filter, NULL);

gst_element_link_many (video_source,video_encoder,video_queue,audio_muxer,NULL);

gst_element_link_many(audio_source,filter,audio_encoder,audio_queue,audio_muxer,NULL);

gst_element_link(audio_muxer,sink);

g_signal_connect (video_source, "pad-added", G_CALLBACK (on_pad_added),sink);

printf("SIGNAL sent ********\n");

g_print ("Now playing: %s\n", argv[1]);

gst_element_set_state (pipeline, GST_STATE_PLAYING);

g_print ("Running...\n");

g_main_loop_run (loop);

g_print ("Returned, stopping playback\n");

gst_element_set_state (pipeline, GST_STATE_NULL);

g_print ("Deleting pipeline\n");

gst_object_unref (GST_OBJECT (pipeline));

g_source_remove (bus_watch_id);

g_main_loop_unref (loop);

return 0;

}

Re: GStreamer

joanxie — Thu, 28 May 2015 08:10:43 GMT

in fact, for capture raw audio and raw video, you can use gstreamer directly, you can refer to the source code of freescale gstreamer, and follow the command as below:

gst-launch videotestsrc num-buffers=250 ! 'video/x-raw-yuv,format=(fourcc)I420,width=320,height=240,framerate=(fraction)25/1' ! queue ! mux. audiotestsrc num-buffers=440 ! audioconvert ! 'audio/x-raw-int,rate=44100,channels=2' ! queue ! mux. avimux name=mux ! filesink location=test.avi

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