How to dynamically change filesrc location and gapless playback and loop using C

[imoni]

Thank you for your answer.

I tried the example 
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/blob/master/tools/gst-play.c#L245
<https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/blob/master/tools/gst-play.c#L245>  

The build did not succeed.

First of all, #include <gst/gst-i18n-app.h> did not exist, so I downloaded
it from 
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/blob/675415bf2ea9ddc75ea5e5b6eae9ae942c19d6dc/gst-libs/gst/gst-i18n-app.h
<https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/blob/675415bf2ea9ddc75ea5e5b6eae9ae942c19d6dc/gst-libs/gst/gst-i18n-app.h> 
.
Is this way OK?

Next, I got the following error.What is the cause of this?
pi at raspberrypi:~ $ gcc tools_gst-play.c `pkg-config --cflags --libs gtk+-3.0
gstreamer-1.0`
tools_gst-play.c: In function ‘play_do_seek’:
tools_gst-play.c:963:22: error: ‘GST_SEEK_FLAG_INSTANT_RATE_CHANGE’
undeclared (first use in this function); did you mean
‘G_TYPE_FLAG_INSTANTIATABLE’?
         seek_flags | GST_SEEK_FLAG_INSTANT_RATE_CHANGE,
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                      G_TYPE_FLAG_INSTANTIATABLE
tools_gst-play.c:963:22: note: each undeclared identifier is reported only
once for each function it appears in
tools_gst-play.c: In function ‘main’:
tools_gst-play.c:1511:29: error: expected ‘)’ before ‘GST_API_VERSION’
   g_set_prgname ("gst-play-" GST_API_VERSION);
                             ^~~~~~~~~~~~~~~~
                             )
tools_gst-play.c:1516:52: error: ‘GETTEXT_PACKAGE’ undeclared (first use in
this function)
   g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
                                                    ^~~~~~~~~~~~~~~
tools_gst-play.c:1532:53: error: ‘PACKAGE_VERSION’ undeclared (first use in
this function); did you mean ‘GST_TAG_VERSION’?
     gst_print ("%s version %s\n", g_get_prgname (), PACKAGE_VERSION);
                                                     ^~~~~~~~~~~~~~~
                                                     GST_TAG_VERSION
tools_gst-play.c:1534:24: error: ‘GST_PACKAGE_ORIGIN’ undeclared (first use
in this function); did you mean ‘GST_PARSE_ERROR_LINK’?
     gst_print ("%s\n", GST_PACKAGE_ORIGIN);
                        ^~~~~~~~~~~~~~~~~~
                        GST_PARSE_ERROR_LINK
tools_gst-play.c:1575:20: error: expected ‘)’ before ‘GST_API_VERSION’
         "gst-play-" GST_API_VERSION);
                    ^~~~~~~~~~~~~~~~
                    )

Thank you and best regards,
imoni




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