gstavauddec could not drain decoder after hlsdemux switching bitrate

[Nicolas Dufresne]

Le samedi 09 novembre 2019 à 20:07 +0800, Sirius Wu a écrit :
> Hi,
> 
> I'm modifying Android tutorial 5 for a HLS player. The branch used is
> 1.16.1.
> 
> I encountered the issue in 
> https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/189,
> so I do not use omx.google.aac.decoder. I do not know why the bug is
> still not fixed on 1.16.1. I use that from libav instead.

Feel free to submit a merge request if you have a solution for this.
Note that omx.google.* are software CODECs, so they aren't always worth
using over ffmpeg.

> 
> Now the player plays HLS links with a constant connection-speed
> perfectly. But if hlsdemux switches bitrate, buffering drops under
> 10% immediately.
> 
> I examined the following logs, it seams that gstavauddec cannot drain
> decoder after switching bitrate, which leads to the buffering
> problem.
> 
> Is there a bug in gstreamer's code which results in this issue?
> 
> Or is this buffering problem can be solved by turing buffer-duration
> or buffer-size?
> 
> ---- Logs starts here ----
> 
> 19:04:03.201 V    [InulPlayer] setMessage: Buffering 98%
> 19:04:03.204 V    [InulPlayer] setMessage: Buffering 99%
> 19:04:03.961 V    [InulPlayer] setMessage: State changed to PLAYING
> ...
> 19:04:09.139 I  ┌ 0:00:38.359795268 0x8a66ab80
> ../ext/hls/gsthlsdemux.c:1601:gst_hls_demux_
> 19:04:09.139 I  ├ change_playlist:<hlsdemux0> Client was on
> 1500000bps, max allowed is 1134
> 19:04:09.139 I  └ 260bps, switching to bitrate 800000bps
> ...
> 19:04:14.177 W  ┌ 0:00:43.397305312 0x7cbf4db0
> ../ext/libav/gstavauddec.c:628:gst_ffmpegaud
> 19:04:14.177 W  └ dec_drain:<avdec_aac0> send packet failed, could
> not drain decoder

This needs investigating. Seems like an interesting bug.

> 19:04:14.957 I    Rkvpu_SendInputData(449): send eos
> 19:04:15.361 V    [InulPlayer] setMessage: Buffering 5%
> 19:04:15.362 V    [InulPlayer] setMessage: Buffering 10%
> 19:04:15.362 V    [InulPlayer] setMessage: Buffering 11%
> 19:04:15.363 V    [InulPlayer] setMessage: Buffering 12%
> 19:04:15.383 I  ┌ 0:00:44.601697021 0x7cb9c980
> ../gst/playback/gstplaybin2.c:3779:no_more_p
> 19:04:15.383 I  └ ads_cb:<playbin0> setting custom audio sink
> <openslessink0>
> 19:04:15.383 I  ┌ 0:00:44.603441188 0x7cb9c980
> ../gst/playback/gstplaybin2.c:3786:no_more_p
> 19:04:15.383 I  └ ads_cb:<playbin0> setting custom video sink
> <glimagesinkbin0>
> 19:04:15.384 V    [InulPlayer] setMessage: Buffering 13%
> 19:04:15.402 V    [InulPlayer] setMessage: Buffering 14%
> 
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