Frame resolution settings in gstreamer pipeline

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Frame resolution settings in gstreamer pipeline

Mohammad, Jamal M
Hi Guys,
 
I am streaming my laptop screen on my IP based display using gstreamer.
Here is the pipeline on both ends:
 
Laptop:
C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc ! queue ! videoconvert ! x264enc ! "video/x-h264,profile=baseline" ! h264parse config-interval=-1 ! rtph264pay pt=96 config-interval=-1 ! udpsink host=<ipaddr> port=5004 sync=true
 
IP Display:
 
gst-launch -v udpsrc port=5004 ! application/x-rtp, payload=96 ! rtph264depay ! vpudec low-latency=true ! imxv4l2sink sync=false
 
The problem is IP Display resolution is 1024x768 but the source plugin is generating 1920x1080, which is my laptop resolution..
 
I need to convert this to the resolution of IP Display, I modified the pipeline on the laptop to following:
C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc  ! video/x-raw, width=1024,height=768,framerate=30/1 !queue ! videoconvert  ! x264enc  ! "video/x-h264,profile=baseline" ! h264parse config-interval=-1 ! rtph264pay pt=96 config-interval=-1 ! udpsink host=<IPAddress> port=5004 sync=true
 
It fails with the following error:
WARNING: erroneous pipeline: could not link dx9screencapsrc0 to queue0, dx9screencapsrc0 can't handle caps video/x-raw, width=(int)1024, height=(int)768, framerate=(fraction)30/1
 
Looking at the caps of dx9screencapsrc using gst-inspect-1.0, it has cap for width and height.
How can I acheive my requirement of capturing the whole screen but converting it to 1024x768
 
Thanks,
Mohammad Jamal Mohiuddin
Software Engineer, Retail Hosp/HW
NCR Corporation India Pvt Ltd.
[hidden email] | www.ncr.com
<< OLE Object: Picture (Device Independent Bitmap) >>
 
 
 

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Re: Frame resolution settings in gstreamer pipeline

new baby
Hi Mohammed,

This was my link when i was using Tx2 hardware , you can modify your command
based on this

gst-launch-1.0 nvcamerasrc sensor-id=0  ! queue !
'video/x-raw(memory:NVMM),width=1280, height=720, format=NV12' ! omxh264enc
bitrate=3000000 control-rate=2  ! 'video/x-h264,
streamformat=(string)byte-stream' ! h264parse ! flvmux name=mux alsasrc
device=plughw:1 ! audioresample ! audio/x-raw,rate=48000,channels=1 ! queue
! voaacenc bitrate=32000 ! queue ! mux. mux.  ! queue ! rtmpsink
location='rtmp://192.168.1.236:1935/live/102'





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RE: Frame resolution settings in gstreamer pipeline

Mohammad, Jamal M
I got error.

C:\Windows\System32>C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc  ! queue ! 'video/x-raw,width=1024,height=768' ! videoconvert  ! x264enc  ! "video/x-h264,profile=baseline" ! h264parse config-interval=-1 ! rtph264pay pt=96 config-interval=-1 ! udpsink host=153.77.205.139 port=5009 sync=true

(gst-launch-1.0:10452): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
WARNING: erroneous pipeline: syntax error

-----Original Message-----
From: gstreamer-devel [mailto:[hidden email]] On Behalf Of aasim
Sent: Friday, February 02, 2018 11:54 AM
To: [hidden email]
Subject: Re: Frame resolution settings in gstreamer pipeline

Hi Mohammed,

This was my link when i was using Tx2 hardware , you can modify your command based on this

gst-launch-1.0 nvcamerasrc sensor-id=0  ! queue !
'video/x-raw(memory:NVMM),width=1280, height=720, format=NV12' ! omxh264enc
bitrate=3000000 control-rate=2  ! 'video/x-h264, streamformat=(string)byte-stream' ! h264parse ! flvmux name=mux alsasrc
device=plughw:1 ! audioresample ! audio/x-raw,rate=48000,channels=1 ! queue ! voaacenc bitrate=32000 ! queue ! mux. mux.  ! queue ! rtmpsink location='rtmp://192.168.1.236:1935/live/102'





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Re: Frame resolution settings in gstreamer pipeline

Antonio Ospite-2
In reply to this post by Mohammad, Jamal M
On Fri, 2 Feb 2018 04:37:10 +0000
"Mohammad, Jamal M" <[hidden email]> wrote:

> Hi Guys,
>
> I am streaming my laptop screen on my IP based display using gstreamer.
> Here is the pipeline on both ends:
>
> Laptop:
> C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc ! queue ! videoconvert ! x264enc ! "video/x-h264,profile=baseline" ! h264parse config-interval=-1 ! rtph264pay pt=96 config-interval=-1 ! udpsink host=<ipaddr> port=5004 sync=true
>
[...]
> I need to convert this to the resolution of IP Display, I modified the pipeline on the laptop to following:
> C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc  ! video/x-raw, width=1024,height=768,framerate=30/1 !queue ! videoconvert  ! x264enc  ! "video/x-h264,profile=baseline" ! h264parse config-interval=-1 ! rtph264pay pt=96 config-interval=-1 ! udpsink host=<IPAddress> port=5004 sync=true
>
> It fails with the following error:
> WARNING: erroneous pipeline: could not link dx9screencapsrc0 to queue0, dx9screencapsrc0 can't handle caps video/x-raw, width=(int)1024, height=(int)768, framerate=(fraction)30/1
>
> Looking at the caps of dx9screencapsrc using gst-inspect-1.0, it has cap for width and height.
> How can I acheive my requirement of capturing the whole screen but converting it to 1024x768
>

The dx9screencapsrc element may define caps for width and height, but
your instance only accepts some values for it, you should see the values
in the output of "gst-launch-1.0 -v" if you look close enough.

So requesting invalid values on the source element will make caps
negotiation to fail.

What you really want to do here is to *resize* the captured 1920x1080
frame down to 1024x768 before encoding it, and that can be done with
the videoscale element:

gst-launch-1.0.exe -v dx9screencapsrc ! queue ! videoconvert ! videoscale ! video/x-raw,width=1024,height=768 ! x264enc ...

Ciao,
   Antonio

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A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
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RE: Frame resolution settings in gstreamer pipeline

Mohammad, Jamal M
Thanks for your help..

The caps has changed to 1024,768 but the display is not full screen.

-----Original Message-----
From: Antonio Ospite [mailto:[hidden email]]
Sent: Friday, February 02, 2018 3:11 PM
To: [hidden email]
Cc: Mohammad, Jamal M <[hidden email]>
Subject: Re: Frame resolution settings in gstreamer pipeline

On Fri, 2 Feb 2018 04:37:10 +0000
"Mohammad, Jamal M" <[hidden email]> wrote:

> Hi Guys,
>
> I am streaming my laptop screen on my IP based display using gstreamer.
> Here is the pipeline on both ends:
>
> Laptop:
> C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc !
> queue ! videoconvert ! x264enc ! "video/x-h264,profile=baseline" !
> h264parse config-interval=-1 ! rtph264pay pt=96 config-interval=-1 !
> udpsink host=<ipaddr> port=5004 sync=true
>
[...]

> I need to convert this to the resolution of IP Display, I modified the pipeline on the laptop to following:
> C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe -v dx9screencapsrc  !
> video/x-raw, width=1024,height=768,framerate=30/1 !queue !
> videoconvert  ! x264enc  ! "video/x-h264,profile=baseline" ! h264parse
> config-interval=-1 ! rtph264pay pt=96 config-interval=-1 ! udpsink
> host=<IPAddress> port=5004 sync=true
>
> It fails with the following error:
> WARNING: erroneous pipeline: could not link dx9screencapsrc0 to
> queue0, dx9screencapsrc0 can't handle caps video/x-raw,
> width=(int)1024, height=(int)768, framerate=(fraction)30/1
>
> Looking at the caps of dx9screencapsrc using gst-inspect-1.0, it has cap for width and height.
> How can I acheive my requirement of capturing the whole screen but
> converting it to 1024x768
>

The dx9screencapsrc element may define caps for width and height, but your instance only accepts some values for it, you should see the values in the output of "gst-launch-1.0 -v" if you look close enough.

So requesting invalid values on the source element will make caps negotiation to fail.

What you really want to do here is to *resize* the captured 1920x1080 frame down to 1024x768 before encoding it, and that can be done with the videoscale element:

gst-launch-1.0.exe -v dx9screencapsrc ! queue ! videoconvert ! videoscale ! video/x-raw,width=1024,height=768 ! x264enc ...

Ciao,
   Antonio

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A: Because it messes up the order in which people normally read text.
   See https://urldefense.proofpoint.com/v2/url?u=http-3A__en.wikipedia.org_wiki_Posting-5Fstyle&d=DwICAg&c=gJN2jf8AyP5Q6Np0yWY19w&r=4h__2a8-7N65qoDnmtsyGh_QYq3kPCn-Loy2L0LHnCs&m=kCnVF3RJC-HQMatVBVA0ElpzZ6jvmU-gTyjHhjKH95A&s=xTS5sZAKaR_th2MAfIb8NWqEcVe333OPy5wOLm7octw&e=
Q: Why is top-posting such a bad thing?
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Re: Frame resolution settings in gstreamer pipeline

Antonio Ospite-2
On Fri, 2 Feb 2018 09:50:53 +0000
"Mohammad, Jamal M" <[hidden email]> wrote:

> Thanks for your help..
>
> The caps has changed to 1024,768 but the display is not full screen.
>

Do you mean that you see borders around the picture?
Or do you see only a part of the captured screen?

If it's the former it's just that 1920x1080 is 16:9 while 1024x768 is
4:3, and videoscale adds borders by default.

Ciao,
   Antonio

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A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
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RE: Frame resolution settings in gstreamer pipeline

Mohammad, Jamal M
There is no cropping, I get borders. It means 16:9?

-----Original Message-----
From: Antonio Ospite [mailto:[hidden email]]
Sent: Friday, February 02, 2018 3:53 PM
To: [hidden email]
Cc: Mohammad, Jamal M <[hidden email]>
Subject: Re: Frame resolution settings in gstreamer pipeline

On Fri, 2 Feb 2018 09:50:53 +0000
"Mohammad, Jamal M" <[hidden email]> wrote:

> Thanks for your help..
>
> The caps has changed to 1024,768 but the display is not full screen.
>

Do you mean that you see borders around the picture?
Or do you see only a part of the captured screen?

If it's the former it's just that 1920x1080 is 16:9 while 1024x768 is 4:3, and videoscale adds borders by default.

Ciao,
   Antonio

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A: Because it messes up the order in which people normally read text.
   See https://urldefense.proofpoint.com/v2/url?u=http-3A__en.wikipedia.org_wiki_Posting-5Fstyle&d=DwICAg&c=gJN2jf8AyP5Q6Np0yWY19w&r=4h__2a8-7N65qoDnmtsyGh_QYq3kPCn-Loy2L0LHnCs&m=pBwnVracLf2Au44w3HUDEPG1majpDR2UsczNuwj1kKw&s=_CojgZH4xjUdxTUnsCdXC7NkEE_Uv5Q9GwjIHh4sHF0&e=
Q: Why is top-posting such a bad thing?
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