seek on filesrc with TS file
Marianna S. Buschle
msb at qtec.com
Thu May 20 11:27:12 UTC 2021
I have tried debugging the error from `tsdemux`, it comes from here:
https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/blob/master/gst/mpegtsdemux/tsdemux.c#L919
And the source for that function is here:
https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/blob/master/gst/mpegtsdemux/mpegtspacketizer.c#L2377
This is the debug info of the first seek, which works:
0:00:06.959642670 199456 0x7fe7a4019800 DEBUG tsdemux
tsdemux.c:967:gst_ts_demux_srcpad_event:<tsdemux0:video_0_0041> Got event
seek
0:00:06.959684979 199456 0x7fe7a4019800 DEBUG tsdemux
tsdemux.c:873:gst_ts_demux_do_seek: seek event, seek event: 0x7fe760013420,
time 99:99:99.999999999, seq-num 375, GstEventSeek, rate=(double)1,
format=(GstFormat)time,
flags=(GstSeekFlags)GST_SEEK_FLAG_FLUSH+GST_SEEK_FLAG_ACCURATE,
cur-type=(GstSeekType)set, cur=(gint64)0, stop-type=(GstSeekType)none,
stop=(gint64)-1, trickmode-interval=(guint64)0;
0:00:06.959698294 199456 0x7fe7a4019800 LOG tsdemux
tsdemux.c:890:gst_ts_demux_do_seek:<tsdemux0> Before seek, output segment
time segment start=0:00:00.125000000, offset=0:00:00.000000000,
stop=99:99:99.999999999, rate=1.000000, applied_rate=1.000000, flags=0x00,
time=0:00:00.125000000, base=0:00:00.000000000, position 0:00:03.925000000,
duration 99:99:99.999999999
0:00:06.959707360 199456 0x7fe7a4019800 DEBUG tsdemux
tsdemux.c:901:gst_ts_demux_do_seek:<tsdemux0> After seek, update 1 output
segment now time segment start=0:00:00.000000000, offset=0:00:00.000000000,
stop=99:99:99.999999999, rate=1.000000, applied_rate=1.000000, flags=0x01,
time=0:00:00.000000000, base=0:00:00.000000000, position 0:00:00.000000000,
duration 99:99:99.999999999
0:00:06.959713536 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2400:mpegts_packetizer_ts_to_offset: Searching offset for
ts 0:00:00.000000000
0:00:06.959716922 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2407:mpegts_packetizer_ts_to_offset: pcr is in current
group
0:00:06.959720421 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2445:mpegts_packetizer_ts_to_offset:
nextgroup:0x7fe7a001a6f0, prevgroup:(nil)
0:00:06.959722987 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2452:mpegts_packetizer_ts_to_offset: In group or after
last one
0:00:06.959726146 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2475:mpegts_packetizer_ts_to_offset: Using prev PCR 0
offset 375
0:00:06.959729468 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2477:mpegts_packetizer_ts_to_offset: Using last PCR
101700000 offset 151527
0:00:06.959733665 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:2485:mpegts_packetizer_ts_to_offset: Returning offset 375
for ts 0:00:00.000000000
0:00:06.959742243 199456 0x7fe7a4019800 DEBUG mpegtsbase
mpegtsbase.c:1357:mpegts_base_sink_event:<mpegtsparse2-0> Got event
flush-start
0:00:06.959749358 199456 0x7fe7a4019800 DEBUG mpegtsbase
mpegtsbase.c:1357:mpegts_base_sink_event:<tsdemux0> Got event flush-start
0:00:06.959783354 199456 0x7fe7a4009060 DEBUG tsdemux
tsdemux.c:3250:gst_ts_demux_push_pending_data:<tsdemux0:video_0_0041>
Returned flushing
0:00:06.959795268 199456 0x7fe7a4009060 DEBUG tsdemux
tsdemux.c:3252:gst_ts_demux_push_pending_data:<tsdemux0:video_0_0041>
combined flushing
0:00:06.959801322 199456 0x7fe7a4009060 LOG tsdemux
tsdemux.c:3282:gst_ts_demux_push_pending_data: Cleared PES data. returning
flushing
0:00:06.959861517 199456 0x7fe7a4019800 DEBUG mpegtsbase
mpegtsbase.c:1357:mpegts_base_sink_event:<mpegtsparse2-0> Got event
flush-stop
0:00:06.959871566 199456 0x7fe7a4019800 DEBUG mpegtsbase
mpegtsbase.c:1357:mpegts_base_sink_event:<tsdemux0> Got event flush-stop
0:00:06.960077437 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:619:mpegts_packetizer_flush: Flushing
0:00:06.960096515 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:1946:_close_current_group: Closing group and resetting
current
0:00:06.960103353 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:1925:_append_group_values: First PCR:0:59:59.879411111
offset:375 PCR_offset:0:00:00.000000000
0:00:06.960107998 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:1930:_append_group_values: Last PCR: +0:00:03.766666666
offset: +151152
0:00:06.960111306 199456 0x7fe7a4019800 DEBUG tsdemux
tsdemux.c:1959:gst_ts_demux_stream_flush: flushing stream 0x7fe7a001cce0
0:00:06.960114489 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:619:mpegts_packetizer_flush: Flushing
0:00:06.960126381 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:1946:_close_current_group: Closing group and resetting
current
0:00:06.960131801 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:1925:_append_group_values: First PCR:0:59:59.879411111
offset:376 PCR_offset:0:00:00.000000000
0:00:06.960135974 199456 0x7fe7a4019800 DEBUG mpegtspacketizer
mpegtspacketizer.c:1930:_append_group_values: Last PCR: +0:00:03.833333333
offset: +153972
And here for the second, which fails:
0:00:09.914908872 199456 0x7fe754012d90 DEBUG tsdemux
tsdemux.c:967:gst_ts_demux_srcpad_event:<tsdemux0:video_0_0041> Got event
seek
0:00:09.914957580 199456 0x7fe754012d90 DEBUG tsdemux
tsdemux.c:873:gst_ts_demux_do_seek: seek event, seek event: 0x7fe74c004e00,
time 99:99:99.999999999, seq-num 601, GstEventSeek, rate=(double)1,
format=(GstFormat)time,
flags=(GstSeekFlags)GST_SEEK_FLAG_FLUSH+GST_SEEK_FLAG_ACCURATE,
cur-type=(GstSeekType)set, cur=(gint64)0, stop-type=(GstSeekType)none,
stop=(gint64)-1, trickmode-interval=(guint64)0;
0:00:09.914982068 199456 0x7fe754012d90 LOG tsdemux
tsdemux.c:890:gst_ts_demux_do_seek:<tsdemux0> Before seek, output segment
time segment start=0:00:00.125000000, offset=0:00:00.000000000,
stop=99:99:99.999999999, rate=1.000000, applied_rate=1.000000, flags=0x01,
time=0:00:00.000000000, base=0:00:00.000000000, position 0:00:03.491666666,
duration 99:99:99.999999999
0:00:09.915008650 199456 0x7fe754012d90 DEBUG tsdemux
tsdemux.c:901:gst_ts_demux_do_seek:<tsdemux0> After seek, update 1 output
segment now time segment start=0:00:00.000000000, offset=0:00:00.000000000,
stop=99:99:99.999999999, rate=1.000000, applied_rate=1.000000, flags=0x01,
time=0:00:00.000000000, base=0:00:00.000000000, position 0:00:00.000000000,
duration 99:99:99.999999999
0:00:09.915014344 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2400:mpegts_packetizer_ts_to_offset: Searching offset for
ts 0:00:00.000000000
0:00:09.915018148 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2407:mpegts_packetizer_ts_to_offset: pcr is in current
group
0:00:09.915021668 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2445:mpegts_packetizer_ts_to_offset:
nextgroup:0x7fe7a001a720, prevgroup:(nil)
0:00:09.915024799 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2452:mpegts_packetizer_ts_to_offset: In group or after
last one
0:00:09.915028582 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2475:mpegts_packetizer_ts_to_offset: Using prev PCR 0
offset 18446744073709551615
0:00:09.915031580 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2477:mpegts_packetizer_ts_to_offset: Using last PCR
90900000 offset 135735
0:00:09.915036435 199456 0x7fe754012d90 DEBUG mpegtspacketizer
mpegtspacketizer.c:2485:mpegts_packetizer_ts_to_offset: Returning offset
18446744073709551615 for ts 0:00:00.000000000
0:00:09.915039441 199456 0x7fe754012d90 WARN tsdemux
tsdemux.c:917:gst_ts_demux_do_seek: Couldn't convert start position to an
offset
0:00:09.915042629 199456 0x7fe754012d90 WARN mpegtsbase
mpegtsbase.c:1721:mpegts_base_handle_seek_event: seeking failed error
0:00:09.915045761 199456 0x7fe754012d90 WARN tsdemux
tsdemux.c:974:gst_ts_demux_srcpad_event: seeking failed
0:00:09.915053277 199456 0x7fe754012d90 DEBUG tsdemux
tsdemux.c:967:gst_ts_demux_srcpad_event:<tsdemux0:video_0_0041> Got event
seek
0:00:09.915056853 199456 0x7fe754012d90 WARN tsdemux
tsdemux.c:974:gst_ts_demux_srcpad_event: seeking failed
The problem seems to be this:
mpegtspacketizer.c:2485:mpegts_packetizer_ts_to_offset: Returning offset
18446744073709551615 for ts 0:00:00.000000000
Which is actually -1 and comes from here:
https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/blob/master/gst/mpegtsdemux/mpegtspacketizer.c#L2453
which actually comes from this pcr_table:
pcrtable = get_pcr_table (packetizer, pcr_pid);
But no idea why that is -1 in the table, I don't actually know anything
about the mpegts internals...
Could it be that something is being set wrong after the first seek?
--
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