#8387: Anomalies with the tee muxer's transparent recovery with HLS and DASH
streams
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Reporter: Brainiarc7 | Owner:
Type: defect | Status: closed
Priority: minor | Component: avformat
Version: git-master | Resolution: invalid
Keywords: hls dash | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by Brainiarc7):
* status: new => closed
* resolution: => invalid
Comment:
'''Update:'''
This ticket should be marked as invalid.
My research on this topic indicates that to enable transparent recovery
for HLS and DASH streams via tee (and fifo) muxer(s), one must pass the
following options:
{{{
HLSOPTS=':use_fifo=1:fifo_options=recovery_wait_time=1\\:attempt_recovery=1\\:drop_pkts_on_overflow=1\\:recover_any_error=1:f=hls:hls_wrap=6:hls_time=6:hls_list_size=6:hls_segment_type=fmp4:ignore_io_errors=0'
DASHOPTS='use_fifo=1:fifo_options=recovery_wait_streamtime=1\\:attempt_recovery=1\\:drop_pkts_on_overflow=1\\:recover_any_error=1:f=dash:seg_duration=6:window_size=6:extra_window_size=0:ignore_io_errors=0'
}}}
With tee spawning fifo'd slaves, the underlying muxer *must* be allowed to
fail so that fifos can recover. See the "ignore_io_errors=0" option passed
to the underlying HLS and tee muxer(s) spawned by fifo'd tees.
Secondly, the recovery logic must be set to rely on the heuristics based
on recovery wait time, which requires the drop packets on overflow option
to be enabled.
Without these options enabled, both HLS and DASH muxers cannot recover
transparently when slaved to tee fifos.
What I was observing was NOT a bug, as initially assumed, but the correct
behavior based on the options set in the tee's fifo slaves.
Marking ticket as closed.
Apologies for the noise.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8387#comment:3>
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