[player] Fix player hanging when terminate #498
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Very particular path to reproduce the issue : - Server must stop sending RTSP stream - Player::stop() and Player::setSources() call after Reasons: When source is set, demuxer is "terminated" (method used to reset it). But this method will hang in this particular case, for 10/15 seconds, due to `av_read_frame` (called by auto packet = demuxer.read()` inside `QAVPlayer::doDemux` method) It seems that FFMPEG doesn't provide a non-blocking equivalent method (flag AVIO_FLAG_NONBLOCK exist but support is really experimental : https://ffmpeg-devel.ffmpeg.narkive.com/k3jOJEmZ/av-read-frame-question-about-blocking). According to multiple thread on this issue : - https://stackoverflow.com/questions/14558172/ffmpeg-av-read-frame-need-very-long-time-to-stop - https://stackoverflow.com/questions/65408224/using-asio-to-implement-interrupt-callback-for-ffmpeg Using a custom `AVFormatContext::interrupt_callback` is the way to do, good thing is that `QAvDemuxer` already provide it and also already provide an option to perform the `abort`. So, be sure to enable `abort` property before explicitly ask to wait for the demuxer to finish (note that setting sources isn't the only way to trigger it, simply destroying player, which call terminate, will trigger this behaviour)
valbok
reviewed
Dec 4, 2024
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| demuxer.abort(); | ||
| demuxerFuture.waitForFinished(); | ||
| demuxer.abort(false); |
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interesting why second call is needed there?
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I have added it to "reset" to his previous state (since abort is false by default). Thus, other methods from FFmpeg will not be prematurely aborted (thinking about TEARDOWN signals not being sent for example).
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oh, forgot that can reset the flag. As I see it is reset already in onLoad, so should work without this line.
legerch
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Dec 5, 2024
Work initially started here : 3bf856a Then 2 PRs in the mainline project has been done related to this subject: - valbok/QtAVPlayer#498 - valbok/QtAVPlayer#500
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This PR is meant to fix player from hanging when demuxer terminate method is called.
More details on this issue will be find inside : #497