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[webvtt] Fix timestamp overflow adjustment (#698)
In some streams, empty segments may appear with a bogus, non-monotone MPEG timestamp. This should not be considered as an overflow Authored by: fstirlitz
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parent
e040bb0a41
commit
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@ -254,8 +254,14 @@ def is_ad_fragment_end(s):
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def pack_fragment(frag_content, frag_index):
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output = io.StringIO()
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adjust = 0
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overflow = False
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mpegts_last = None
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for block in webvtt.parse_fragment(frag_content):
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if isinstance(block, webvtt.CueBlock):
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extra_state['webvtt_mpegts_last'] = mpegts_last
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if overflow:
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extra_state['webvtt_mpegts_adjust'] += 1
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overflow = False
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block.start += adjust
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block.end += adjust
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@ -296,9 +302,9 @@ def pack_fragment(frag_content, frag_index):
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extra_state.setdefault('webvtt_mpegts_adjust', 0)
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block.mpegts += extra_state['webvtt_mpegts_adjust'] << 33
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if block.mpegts < extra_state.get('webvtt_mpegts_last', 0):
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extra_state['webvtt_mpegts_adjust'] += 1
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overflow = True
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block.mpegts += 1 << 33
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extra_state['webvtt_mpegts_last'] = block.mpegts
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mpegts_last = block.mpegts
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if frag_index == 1:
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extra_state['webvtt_mpegts'] = block.mpegts or 0
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