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local rtsp server video show delay 7+ seconds

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Dengke Du

local rtsp server video show delay 7+ seconds

Hi all

gst-launch-1.0 --version

     gst-launch-1.0 version 1.14.2
     GStreamer 1.14.2
     Unknown package origin

My device info: v4l2-ctl --list-formats

ioctl: VIDIOC_ENUM_FMT
     Index       : 0
     Type        : Video Capture
     Pixel Format: 'YUYV'
     Name        : YUYV 4:2:2

     Index       : 1
     Type        : Video Capture
     Pixel Format: 'MJPG' (compressed)
     Name        : Motion-JPEG

Server side:

     In rtsp examples directory: ./test-launch "( v4l2src ! image/jpeg !
jpegdec ! x264enc ! rtph264pay name=pay0 pt=96 )"

Client side:

     gst-launch-1.0 -v playbin uri=rtsp://127.0.0.1:8554/test

The video show delay 7+ seconds, does somebody know why?

Thanks!

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Michael MacIntosh

Re: local rtsp server video show delay 7+ seconds

x264 enc by default introduces at least a few seconds of delay
(depending on the framerate, I think it caches about 40 frames)

Try setting x264enc to use the zerolatency tuning preset. It might also
be a good idea to separate your jpegdec and x264enc with a queue, so
they run in separate threads.

On 10/8/2018 2:18 AM, Dengke Du wrote:

> Hi all
>
> gst-launch-1.0 --version
>
>     gst-launch-1.0 version 1.14.2
>     GStreamer 1.14.2
>     Unknown package origin
>
> My device info: v4l2-ctl --list-formats
>
> ioctl: VIDIOC_ENUM_FMT
>     Index       : 0
>     Type        : Video Capture
>     Pixel Format: 'YUYV'
>     Name        : YUYV 4:2:2
>
>     Index       : 1
>     Type        : Video Capture
>     Pixel Format: 'MJPG' (compressed)
>     Name        : Motion-JPEG
>
> Server side:
>
>     In rtsp examples directory: ./test-launch "( v4l2src ! image/jpeg
> ! jpegdec ! x264enc ! rtph264pay name=pay0 pt=96 )"
>
> Client side:
>
>     gst-launch-1.0 -v playbin uri=rtsp://127.0.0.1:8554/test
>
> The video show delay 7+ seconds, does somebody know why?
>
> Thanks!
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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Nicolas Dufresne-5

Re: local rtsp server video show delay 7+ seconds

In reply to this post by Dengke Du

Le lun. 8 oct. 2018 05 h 27, Dengke Du <[hidden email]> a écrit :

Hi all

gst-launch-1.0 --version

     gst-launch-1.0 version 1.14.2
     GStreamer 1.14.2
     Unknown package origin

My device info: v4l2-ctl --list-formats

ioctl: VIDIOC_ENUM_FMT
     Index       : 0
     Type        : Video Capture
     Pixel Format: 'YUYV'
     Name        : YUYV 4:2:2

     Index       : 1
     Type        : Video Capture
     Pixel Format: 'MJPG' (compressed)
     Name        : Motion-JPEG

Server side:

     In rtsp examples directory: ./test-launch "( v4l2src ! image/jpeg !
jpegdec ! x264enc ! rtph264pay name=pay0 pt=96 )"

Default x264 settings are high latency. Try with setting tune=zerolatency. That will drop the latency to around two sec. 2s is the configured latency on the rtspsrc element. You can reconfigure that using the playbin callbacks, or child proxy mechanism.

Client side:

gst-launch-1.0 -v playbin uri=rtsp://127.0.0.1:8554/test

The video show delay 7+ seconds, does somebody know why?

Thanks!

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[hidden email]
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Dengke Du

Re: local rtsp server video show delay 7+ seconds

On 2018年10月09日 07:31, Nicolas Dufresne wrote:

Le lun. 8 oct. 2018 05 h 27, Dengke Du <[hidden email]> a écrit :

Hi all

gst-launch-1.0 --version

     gst-launch-1.0 version 1.14.2
     GStreamer 1.14.2
     Unknown package origin

My device info: v4l2-ctl --list-formats

ioctl: VIDIOC_ENUM_FMT
     Index       : 0
     Type        : Video Capture
     Pixel Format: 'YUYV'
     Name        : YUYV 4:2:2

     Index       : 1
     Type        : Video Capture
     Pixel Format: 'MJPG' (compressed)
     Name        : Motion-JPEG

Server side:

     In rtsp examples directory: ./test-launch "( v4l2src ! image/jpeg !
jpegdec ! x264enc ! rtph264pay name=pay0 pt=96 )"

Default x264 settings are high latency. Try with setting tune=zerolatency. That will drop the latency to around two sec. 2s is the configured latency on the rtspsrc element. You can reconfigure that using the playbin callbacks, or child proxy mechanism.

Thanks!
1. After adding "tune=zerolatency" drop the latency 2-3s
2. Using the following instead of playbin drop the latency 4-5s:
gst-launch-1.0 rtspsrc location=<a class="moz-txt-link-rfc2396E" href="rtsp://127.0.0.1:8554/test">"rtsp://127.0.0.1:8554/test" latency=0 ! rtph264depay ! decodebin ! videoconvert ! ximagesink

Client side:

gst-launch-1.0 -v playbin uri=<a class="moz-txt-link-freetext" href="rtsp://">rtsp://127.0.0.1:8554/test

The video show delay 7+ seconds, does somebody know why?

Thanks!

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_______________________________________________
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