PTS Offset to Add Artificial Delay Not Working

[Abrar Shahriar]

There is a sender app and a receiver app.
Sender is pulsesrc ->queue -> rtpL16pay -> udpsink
Receiver is udpsrc -> queue -> rtpjitterbuffer( "mode", 1,"latency", 0 for least latency) -> (probe to offset PTS dynamically)queue-> pulsesink (sync is TRUE )

-Abrar



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アブラル・Tヒン・シャハリアル  (Abrar Zahin Shahriar)

ハイパーダイン株式会社
〒108−0014　東京都港区芝5丁目9−12　3階

________________________________
From: Michiel Konstapel <michiel at aanmelder.nl>
Sent: Thursday, May 19, 2022 6:04 PM
To: Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org>
Cc: Abrar Shahriar <abrar.shahriar at hiperdyne.com>
Subject: Re: PTS Offset to Add Artificial Delay Not Working


I think I've seen (or heard) this happen as wel, but I have no idea why :-/ Hopefully someone more knowledgeable will chip in. Do you have an example pipeline that produces this effect?

Michiel


On 19-05-2022 06:57, Abrar Shahriar via gstreamer-devel wrote:
I've run into another issue with this.

If I increase the PTS offset, it works, but if I then decrease the offset afterwards (to the original offset of 0), the audio quality greatly degrades.



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アブラル・ザヒン・シャハリアル  (Abrar Zahin Shahriar)

ハイパーダイン株式会社
〒108−0014　東京都港区芝5丁目9−12　3階

________________________________
From: Abrar Shahriar <abrar.shahriar at hiperdyne.com><mailto:abrar.shahriar at hiperdyne.com>
Sent: Wednesday, May 18, 2022 1:26 PM
To: Michiel Konstapel <michiel at aanmelder.nl><mailto:michiel at aanmelder.nl>; Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org><mailto:gstreamer-devel at lists.freedesktop.org>
Subject: Re: PTS Offset to Add Artificial Delay Not Working

Update: It did work when I set the audio sink "sync" to TRUE.

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アブラル・ザヒン・シャハリアル  (Abrar Zahin Shahriar)

ハイパーダイン株式会社
〒108−0014　東京都港区芝5丁目9−12　3階

________________________________
From: Abrar Shahriar <abrar.shahriar at hiperdyne.com><mailto:abrar.shahriar at hiperdyne.com>
Sent: Wednesday, May 18, 2022 1:00 PM
To: Michiel Konstapel <michiel at aanmelder.nl><mailto:michiel at aanmelder.nl>; Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org><mailto:gstreamer-devel at lists.freedesktop.org>
Subject: Re: PTS Offset to Add Artificial Delay Not Working

Tried it, unfortunately it did not work.


ーーーーーーーーー

アブラル・ザヒン・シャハリアル  (Abrar Zahin Shahriar)

ハイパーダイン株式会社
〒108−0014　東京都港区芝5丁目9−12　3階

________________________________
From: Michiel Konstapel <michiel at aanmelder.nl><mailto:michiel at aanmelder.nl>
Sent: Tuesday, May 17, 2022 10:12 PM
To: Abrar Shahriar <abrar.shahriar at hiperdyne.com><mailto:abrar.shahriar at hiperdyne.com>; Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org><mailto:gstreamer-devel at lists.freedesktop.org>
Subject: Re: PTS Offset to Add Artificial Delay Not Working


Yes, by default the queue is limited to 200 buffers, 1 MB, or 1 second of data - whichever limit is hit first. You can check the default values in the docs: https://gstreamer.freedesktop.org/documentation/coreelements/queue.html?gi-language=c#properties


So for a 5 second queue, you can set max-size-buffers and max-size-bytes to zero (no limit) and max-size-time to 5000000000.


On 17-05-2022 09:49, Abrar Shahriar wrote:
I tried adding Queue plugins both before and after, still no success. Do I need to set some params of the Queue elements?


ーーーーーーーーー

アブラル・ザヒン・シャハリアル  (Abrar Zahin Shahriar)

ハイパーダイン株式会社
〒108−0014　東京都港区芝5丁目9−12　3階

________________________________
From: Michiel Konstapel <michiel at aanmelder.nl><mailto:michiel at aanmelder.nl>
Sent: Monday, May 16, 2022 6:11 PM
To: Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org><mailto:gstreamer-devel at lists.freedesktop.org>
Cc: Abrar Shahriar <abrar.shahriar at hiperdyne.com><mailto:abrar.shahriar at hiperdyne.com>
Subject: Re: PTS Offset to Add Artificial Delay Not Working


You may need to ensure that you have at least 5 seconds of queue capacity, because the buffers will have to be held somewhere before they can be processed at the later PTS. I don't know if this needs to be before the probed pad, or before the downstream element that cares about the PTS (sink, muxer, mixer, encoder, ..?)
Kind regards,
Michiel


On 16-05-2022 11:05, Abrar Shahriar via gstreamer-devel wrote:
Hi,

I tried to add 5 seconds (in ns) to the PTS values on the incoming buffers in a probe, but I see no delay. I tried it for both audio and video streams.

What could be the reason for it not working? I thought PTS could be used to adjust delay?

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