I'm using qtmux to merge audio and video to mp4 container file with GStreamer. My pipeline looks like:
gst-launch-1.0 autovideosrc ! x264enc ! queue ! qtmux0. autoaudiosrc! wavenc ! queue ! qtmux ! filesink location=file.mp4
videotestsrc --> x264enc -----\
>---> qtmux ---> filesink
audiotestsrc --> wavenc ------/
It's working good with commandline. But I want to code it in C code. I was stuck in this part:
x264enc -----\
>---> qtmux
wavenc ------/
This is codes for this part.
gst_element_link_many(audiosource, wavenc, audioqueue, NULL);
gst_element_link_many(videosource, x264enc, videoqueue, NULL);
gst_element_link_many(qtmux, filesink, NULL);
audio_pad = gst_element_get_request_pad (audioqueue, "src");
mux_audio_pad = gst_element_get_static_pad (qtmux, "sink_1");
gst_pad_link (audio_pad,mux_audio_pad); **# ERROR HERE**
video_pad = gst_element_get_request_pad (videoqueue, "src");
mux_video_pad = gst_element_get_static_pad(qtmux, "sink_2");
gst_pad_link (video_pad,mux_video_pad); **# ERROR HERE**
But it's wrong in step link pads. And the error type: GST_PAD_LINK_NOFORMAT (-4) – pads do not have common format
How can I fix it ?
I think you have switches request/static pad calls here. The queue should have static pads while the muxer has request pads.
You can also make your life easier by using gst_parse_launch() function to create a pipeline as you do on the command line therefore saving a lot of error prone code.