DVB-T and DVB-T2: quick sanity check

[Russel Winder]

On Mon, 2016-04-18 at 10:35 -0700, Reynaldo H. Verdejo Pinochet wrote:
> Hi Russel. I'm interested on DVB working across the set of
> delivery systems we claim support for. Can you share some
> more details about your DVB-T2 findings?

Background is I am trying to decide whether to try and make the current
dvbsrc plugin work properly with DVBv5 or to rewrite it depending on
libdvbv5: currently dvbsrc source looks an awful lot like the libdvbv5
source.

This particular problem can be characterized with this example from Me TV
use. I try to tune to BBC NEWS HD, and I get the following. I think the fact
that it tries to tune twice is understandable given the current state of the
Me TV code. The tuner is a DVB-T2 one, dvbv5-zap has no problem tuning the
device.



0:00:02.875841945 12453      0x1b2d600 FIXME                 dvbsrc gstdvbsrc.c:2032:gst_dvbsrc_is_valid_modulation: No delsys/modulation sanity checks implemented for this delivery system
0:00:02.891187218 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc0> Failed to get statistics from the device: Operation not supported
0:00:02.892660382 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc0> Failed to get statistics from the device: Operation not supported
…
10s of this message ever few millisconds
…
0:00:12.888868728 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc0> Failed to get statistics from the device: Operation not supported
0:00:12.890716122 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc0> Failed to get statistics from the device: Operation not supported
0:00:12.890735666 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2300:gst_dvbsrc_tune_fe:<dvbsrc0> Unable to lock on signal at desired frequency
0:00:12.890752099 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2316:gst_dvbsrc_tune_fe:<dvbsrc0> Could not tune to desired frequency
0:00:12.891045607 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2576:gst_dvbsrc_tune:<dvbsrc0> Unable to tune frontend
0:00:12.891059010 12453      0x1b2d600 ERROR                 dvbsrc gstdvbsrc.c:1953:gst_dvbsrc_start:<dvbsrc0> Not able to lock on to the dvb channel
0:00:12.891112268 12453      0x1b2d600 WARN                 basesrc gstbasesrc.c:3721:gst_base_src_activate_push:<dvbsrc0> Failed to start in push mode
0:00:12.891126177 12453      0x1b2d600 WARN                GST_PADS gstpad.c:1106:gst_pad_set_active:<dvbsrc0:src> Failed to activate pad
0:00:12.896698572 12453      0x1b2d600 FIXME                 dvbsrc gstdvbsrc.c:2032:gst_dvbsrc_is_valid_modulation: No delsys/modulation sanity checks implemented for this delivery system
0:00:12.896787915 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc1> Failed to get statistics from the device: Operation not supported
0:00:12.896818596 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc1> Failed to get statistics from the device: Operation not supported
…
10s of this same error message every few milliseconds.
…
0:00:22.898517392 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2094:gst_dvbsrc_output_frontend_stats:<dvbsrc1> Failed to get statistics from the device: Operation not supported
0:00:22.898617691 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2300:gst_dvbsrc_tune_fe:<dvbsrc1> Unable to lock on signal at desired frequency
0:00:22.898667859 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2316:gst_dvbsrc_tune_fe:<dvbsrc1> Could not tune to desired frequency
0:00:22.899034922 12453      0x1b2d600 WARN                  dvbsrc gstdvbsrc.c:2576:gst_dvbsrc_tune:<dvbsrc1> Unable to tune frontend
0:00:22.899082563 12453      0x1b2d600 ERROR                 dvbsrc gstdvbsrc.c:1953:gst_dvbsrc_start:<dvbsrc1> Not able to lock on to the dvb channel
0:00:22.899173636 12453      0x1b2d600 WARN                 basesrc gstbasesrc.c:3721:gst_base_src_activate_push:<dvbsrc1> Failed to start in push mode
0:00:22.899232840 12453      0x1b2d600 WARN                GST_PADS gstpad.c:1106:gst_pad_set_active:<dvbsrc1:src> Failed to activate pad

(me-tv:12453): GLib-GObject-CRITICAL **: g_object_get: assertion 'G_IS_OBJECT (object)' failed
Segmentation fault (core dumped)

 
-- 
Russel.
=============================================================================
Dr Russel Winder     t:+44 20 7585 2200   voip:sip:
russel.winder at ekiga.net
41 Buckmaster Road   m:+44 7770 465 077   xmpp:russel at winder.org.uk
London SW11 1EN, UK  w: www.russel.org.uk skype:russel_winder
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