Re: splitmuxsink, issues with max-size-time and exact duration

Hi!

I think it depends on seconds between  key (I) frames since splitmuxsink
begins each new file with a key frame.

пт, 21 июл. 2023 г. в 13:46, Антон Шаров via gstreamer-devel <
[email protected]>:

> Hi.
>
> I found very strange issue with splitmuxsink and it’s  max-size-time
> property, namely
> given n sec. for desired duration, it’s actual duration would be n-2 sec.
> Initially I’ve discovered this
> issue while testing hand-coded pipeline, but then desided to reproduce the
> issue with gst-launch
> and observed the very same behaviour. Given
> gst-launch-1.0 -e -v rtspsrc buffer-mode=0
> add-reference-timestamp-meta=true  location=rtsp://user:pass@ip_addr/onvif/media?profile=Profile1
> ! rtph264depay ! h264parse ! splitmuxsink
> location="d:\\video_files\\video_%02d.mp4" max-size-time=10000000000
> (note, max-size-time=10000000000 is 10 sec in nanoseconds)
> the actual duration of files will be 8 sec.
> Same for 7→ 5, 5→ 3, and so on. So, it seems to be the pattern — set for n
> secodns, receive for n-2 seconds.
> Is it ok or maybe I miss something? I don’t think that it depends on
> rtps source.
>
> Thanks in advance.
>
> Here some initial seesion info:
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager: latency =
> 2000
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager: ntp-sync =
> false
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager: rfc7273-sync
> = false
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager:
> add-reference-timestamp-meta = true
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager:
> ntp-time-source = ntp
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager:
> drop-on-latency = false
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager:
> max-rtcp-rtp-time-diff = 1000
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager:
> max-ts-offset-adjustment = 0
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager: buffer-mode
> = none
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc1: timeout =
> 5000000000
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc1: caps =
> application/x-rtp, media=(string)video, payload=(int)97,
> clock-rate=(int)90000, encoding-name=(string)H264,
> packetization-mode=(string)1, profile-level-id=(string)4D00000000000000,
> sprop-parameter-sets=(string)"Z00AH52oFAFum4CAgIE\=\,aO48gA\=\=",
> a-framerate=(string)15, ssrc=(uint)3053121902
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc2: caps =
> application/x-rtcp
> Progress: (request) SETUP stream 1
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc3: timeout =
> 5000000000
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc3: caps =
> application/x-rtp, media=(string)audio, payload=(int)0,
> clock-rate=(int)8000, encoding-name=(string)PCMU,
> encoding-params=(string)1, ssrc=(uint)2174462030
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc4: caps =
> application/x-rtcp
> Progress: (open) Opened Stream
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstRtpBin:manager: buffer-mode
> = none
> Progress: (request) Sending PLAY request
> Redistribute latency...
> Redistribute latency...
> Progress: (request) Sending PLAY request
> Redistribute latency...
> Redistribute latency...
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc1: caps =
> application/x-rtp, media=(string)video, payload=(int)97,
> clock-rate=(int)90000, encoding-name=(string)H264,
> packetization-mode=(string)1, profile-level-id=(string)4D00000000000000,
> sprop-parameter-sets=(string)"Z00AH52oFAFum4CAgIE\=\,aO48gA\=\=",
> a-framerate=(string)15, ssrc=(uint)3053121902, clock-base=(uint)2632806877,
> seqnum-base=(uint)14666, npt-start=(guint64)0, play-speed=(double)1,
> play-scale=(double)1, onvif-mode=(boolean)false
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc3: caps =
> application/x-rtp, media=(string)audio, payload=(int)0,
> clock-rate=(int)8000, encoding-name=(string)PCMU,
> encoding-params=(string)1, ssrc=(uint)2174462030,
> clock-base=(uint)661265319, seqnum-base=(uint)53364, npt-start=(guint64)0,
> play-speed=(double)1, play-scale=(double)1, onvif-mode=(boolean)false
> Progress: (request) Sent PLAY request
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc1.GstPad:src:
> caps = application/x-rtp, media=(string)video, payload=(int)97,
> clock-rate=(int)90000, encoding-name=(string)H264,
> packetization-mode=(string)1, profile-level-id=(string)4D00000000000000,
> sprop-parameter-sets=(string)"Z00AH52oFAFum4CAgIE\=\,aO48gA\=\=",
> a-framerate=(string)15, ssrc=(uint)3053121902, clock-base=(uint)2632806877,
> seqnum-base=(uint)14666, npt-start=(guint64)0, play-speed=(double)1,
> play-scale=(double)1, onvif-mode=(boolean)false
>
>
>
> --
> С Уважением,
> Шаров Антон
>