Extraction of Overlay Data from Video File

[PRADEEP NALAWADE]

Hi,

I am using the following command to overlay text onto the video and store it.

gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Video 1" valignment=top halignment=left font-desc="Sans, 60" ! timeoverlay ! vpuenc_h264 ! mp4mux ! filesink location=video_264.mp4

Now I have to extract the overlay information from the stored video file. Is there any command available to extract the overlay information from the stored video.

Thanks & Best Regards,

Pradeep Nalawade

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[胡珩]

i think you can't. because the text has became pixels mixed with video frames. why not backup the text before textoverlay?

At 2016-12-23 13:07:50, "PRADEEP NALAWADE" <[hidden email]> wrote:

Hi,

I am using the following command to overlay text onto the video and store it.

gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Video 1" valignment=top halignment=left font-desc="Sans, 60" ! timeoverlay ! vpuenc_h264 ! mp4mux ! filesink location=video_264.mp4

Now I have to extract the overlay information from the stored video file. Is there any command available to extract the overlay information from the stored video.

Thanks & Best Regards,

Pradeep Nalawade

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[hidden email]
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[胡珩]

i think you can't. because the text has became pixels mixed with video frames. why not backup the text before textoverlay?

At 2016-12-23 13:07:50, "PRADEEP NALAWADE" <[hidden email]> wrote:

Hi,

I am using the following command to overlay text onto the video and store it.

gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Video 1" valignment=top halignment=left font-desc="Sans, 60" ! timeoverlay ! vpuenc_h264 ! mp4mux ! filesink location=video_264.mp4

Now I have to extract the overlay information from the stored video file. Is there any command available to extract the overlay information from the stored video.

Thanks & Best Regards,

Pradeep Nalawade

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gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

[PRADEEP NALAWADE]

Thanks for your reply.

Is there any other way to overlay text onto the video, so that it can be extracted later from the video.

On Friday 23 December 2016 12:09 PM, 胡珩 wrote:

i think you can't. because the text has became pixels mixed with video frames. why not backup the text before textoverlay?

At 2016-12-23 13:07:50, "PRADEEP NALAWADE" [hidden email] wrote:

Hi,

I am using the following command to overlay text onto the video and store it.

gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Video 1" valignment=top halignment=left font-desc="Sans, 60" ! timeoverlay ! vpuenc_h264 ! mp4mux ! filesink location=video_264.mp4

Now I have to extract the overlay information from the stored video file. Is there any command available to extract the overlay information from the stored video.

Thanks & Best Regards,

Pradeep Nalawade

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[hidden email]
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[Krutskikh Ivan]

You can use subtitles

2016-12-23 10:11 GMT+03:00 PRADEEP NALAWADE <[hidden email]>:

Thanks for your reply.

Is there any other way to overlay text onto the video, so that it can be extracted later from the video.

On Friday 23 December 2016 12:09 PM, 胡珩 wrote:

i think you can't. because the text has became pixels mixed with video frames. why not backup the text before textoverlay?

At 2016-12-23 13:07:50, "PRADEEP NALAWADE" [hidden email] wrote:

Hi,

I am using the following command to overlay text onto the video and store it.

gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Video 1" valignment=top halignment=left font-desc="Sans, 60" ! timeoverlay ! vpuenc_h264 ! mp4mux ! filesink location=video_264.mp4

Now I have to extract the overlay information from the stored video file. Is there any command available to extract the overlay information from the stored video.

Thanks & Best Regards,

Pradeep Nalawade

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[PRADEEP NALAWADE]

Thanks for your reply.

I am new to the gstreamer. So can you please share how to overlay subtitles instead of textOverlay and how to extract the subtitles from the video.

On Friday 23 December 2016 01:05 PM, Krutskikh Ivan wrote:

You can use subtitles

2016-12-23 10:11 GMT+03:00 PRADEEP NALAWADE <[hidden email]>:

Thanks for your reply.

Is there any other way to overlay text onto the video, so that it can be extracted later from the video.

On Friday 23 December 2016 12:09 PM, 胡珩 wrote:

i think you can't. because the text has became pixels mixed with video frames. why not backup the text before textoverlay?

At 2016-12-23 13:07:50, "PRADEEP NALAWADE" [hidden email] wrote:

Hi,

I am using the following command to overlay text onto the video and store it.

gst-launch-1.0 -e imxv4l2videosrc ! textoverlay text="Video 1" valignment=top halignment=left font-desc="Sans, 60" ! timeoverlay ! vpuenc_h264 ! mp4mux ! filesink location=video_264.mp4

Now I have to extract the overlay information from the stored video file. Is there any command available to extract the overlay information from the stored video.

Thanks & Best Regards,

Pradeep Nalawade

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gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[Mikl]

Hi

I am using matroska container to add subtitles to the video.
Inserting using buffer of appsrc.
Extract from buffer of appsinc, previously link it it "NewPadAdded" event

record pipeline:
appsrc ! text/x-raw ! matroskamux ! filesink

extract pipeline:
filesrc ! matroskademux ! text/x-raw format=pango-markup ! appsink


Try it yourself. And if no luck, i will send you my source code. :)

Mikl

[PRADEEP NALAWADE]

Thanks Mikl.

-----Original Message-----
From: gstreamer-devel [mailto:[hidden email]] On Behalf Of Mikl
Sent: 04 January 2017 06:26 PM
To: [hidden email]
Subject: Re: Extraction of Overlay Data from Video File

Hi

I am using matroska container to add subtitles to the video.
Inserting using buffer of appsrc.
Extract from buffer of appsinc, previously link it it "NewPadAdded" event

record pipeline:
appsrc ! text/x-raw ! matroskamux ! filesink

extract pipeline:
filesrc ! matroskademux ! text/x-raw format=pango-markup ! appsink


Try it yourself. And if no luck, i will send you my source code. :)

Mikl



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[mudassar]

Hi Mikl,

I working on a project where we need to multiplex live subtitles in a live stream and then consume those subtitles on the reader side as metadata. so for this I am working on similar lines as you described.

 However, my application does not generate a playable file. My code translates to following pipeline


uridecodebin ! videoconvert ! video/x-raw format=I420 ! queue ! vp8enc ! mux. appsrc ! application/x-subtitle format={pango-markup, utf8 } stream-type=0 format=3 is-live=true do-timestamp=true ! subparse ! kateenc category=SUB ! queue ! mux. webmmux name=mux ! queue ! filesink

I tried replacing webmmux with matroskamux but with no success.

I also get this warning sometimes: <subparse> could not convert string from 'UTF-8' to UTF-8: Invalid byte sequence in conversion input



It might help if you could share your code which seams to be doing similar thing.

Regards,
M

[Mikl]

Hello,

Here it is.

But, i am using different container for my subtitles.

Mikl

---

From: mudassar [via GStreamer-devel] <ml+[hidden email]>
Sent: Wednesday, May 10, 2017 11:59:11 AM
To: Michael Yarochkin
Subject: Re: Extraction of Overlay Data from Video File

 

Hi Miki,

I working on a project where we need to multiplex live subtitles in a live stream and then consume those subtitles on the reader side as metadata. so for this I am working on similar lines as you described.

 However, my application does not generate a playable file. My code translates to following pipeline


uridecodebin ! videoconvert ! video/x-raw format=I420 ! queue ! vp8enc ! mux. appsrc ! application/x-subtitle format={pango-markup, utf8 } stream-type=0 format=3 is-live=true do-timestamp=true ! subparse ! kateenc category=SUB ! queue ! mux. webmmux name=mux ! queue ! filesink

I tried replacing webmmux with matroskamux but with no success.

I also get this warning sometimes: <subparse> could not convert string from 'UTF-8' to UTF-8: Invalid byte sequence in conversion input



It might help if you could share your code which seams to be doing similar thing.

Regards,
M

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[mudassar]

Great ! Thanks Mikl.