From time to time, running totem on an otherwise vanilla Ogg/Vorbis/Theora video will critical due to attempting to intersect caps with NULL.

Command line:
G_DEBUG=fatal_criticals GST_DEBUG_FILE=gst.log GST_DEBUG=6 totem ~/Samples/big_buck_bunny_480p_stereo.ogg

It's racy, so I got this twice in a couple dozen runs. When it happens, it happens at the start. 


Stack trace:

+ Trace 237475

$1 = {parent = {element = {element = {object = {object = {g_type_instance = {g_class = 0x5641fcbaab50}, ref_count = 8, qdata = 0x0}, lock = {p = 0x0, i = {0, 0}}, 
          name = 0x5641fcbced80 "cluttergstvideosink0", parent = 0x5641fcf6ed70 [GstBin], Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
flags = 32, control_bindings = 0x0, control_rate = 100000000, 
          last_sync = 18446744073709551615, _gst_reserved = 0x0}, state_lock = {p = 0x5641fcba7c10, i = {0, 0}}, state_cond = {p = 0x0, i = {5, 0}}, state_cookie = 2, 
        target_state = GST_STATE_PAUSED, current_state = GST_STATE_READY, next_state = GST_STATE_PAUSED, pending_state = GST_STATE_PAUSED, 
        last_return = GST_STATE_CHANGE_ASYNC, bus = 0x5641fd0b5d80 [GstBus], clock = 0x0, base_time = 0, start_time = 0, Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
numpads = 1, pads = 0x5641fc8a3b40, 
        numsrcpads = 0Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
, srcpads = 0x0, Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
numsinkpads = 1, sinkpads = 0x5641fc8a38a0, pads_cookie = 1, _gst_reserved = {0x0, 0x0, 0x0, 0x0}}, 
      sinkpad = 0x5641fcba84e0 [GstPad], pad_mode = GST_PAD_MODE_PUSH, offset = 0, can_activate_pull = 0, can_activate_push = 1, preroll_lock = {p = 0x0, i = {0, 0}}, 
      preroll_cond = {p = 0x0, i = {0, 0}}, eos = 0, need_preroll = 1, have_preroll = 0, playing_async = 1, have_newsegment = 0, segment = {
        flags = GST_SEGMENT_FLAG_NONE, rate = 1, applied_rate = 1, format = GST_FORMAT_UNDEFINED, base = 0, offset = 0, start = 0, stop = 18446744073709551615, 
        time = 0, position = 0, duration = 18446744073709551615, _gst_reserved = {0x0, 0x0, 0x0, 0x0}}, clock_id = 0x0, sync = 1, flushing = 0, running = 0, 
      max_lateness = 20000000, priv = 0x5641fcb9f970, _gst_reserved = {0x0 <repeats 20 times>}}, width = 0, height = 0, priv = 0x5641fcb9f960, _gst_reserved = {0x0, 
      0x0, 0x0, 0x0}}, priv = 0x5641fcb9f800}


$ totem --version
totem 3.18.1

Gstreamer core and plugins are more or less master as of now.

$ oggz info ~/Samples/big_buck_bunny_480p_stereo.ogg 
Content-Duration: 00:09:56.458

Theora: serialno 0252082401
	14318 packets in 35574 pages, 0.4 packets/page, 1.018% Ogg overhead
	Theora-Version: 3.2.1
	Video-Framerate: 24.000 fps
	Video-Width: 854
	Video-Height: 480

Vorbis: serialno 0531112804
	35978 packets in 3103 pages, 11.6 packets/page, 1.128% Ogg overhead
	Audio-Samplerate: 48000 Hz
	Audio-Channels: 2