Video processing(record\play) real time from camera with metadata

[Mikl]

Hello, Tim


Thank you for the answer.

I will try to give you more information, so may be you can help me.

Don`t hesitate to ask more, if something is unclear.


-Coding is a time related question. I need to capture 20 fps and more. It means i have 50 ms to capture, code and record. Not much even on fast machine. But, record raw data also not ideal. I have 1Gb every 50 sec from 20 frames of RGB 800x400.


-Decoding is not real time process. It will be handy for me to have all necessary information inside of one container.


-You want to say, what i can not add subtitles to the video using gstreamer? Is ANY way exist?


-In ideal situation i need to have video file with audio  (this is for later) and subtitles. An i need to be able to pay it in a standard video player. As example of user i can give you TV broadcasting system. Best if i can stream it while recording.


It is an ideal goal. Do not focus too much and do not block yourself, please, if it is impossible. I need to be as close as possible.


Best regards, Michael.

________________________________
From: Tim Müller [via GStreamer-devel] <ml-node+s966125n4679413h52 at n4.nabble.com>
Sent: Sunday, September 4, 2016 10:29:56 PM
To: Michael Yarochkin
Subject: Re: Video processing(record\play) real time from camera with metadata

On Wed, 2016-08-31 at 01:16 -0700, Mikl wrote:

Hi Mikl,

> Currently, i am developing commercial application for recording video
> stream from IP camera in real time.
> Also i need to add information to some of the frames. It will be like
> image metadata. For example, time of capturing, location, comment,...
> And of course i need to be able to read it later. As i understand, i
> need to use subtitles or it is another way exist? But in any way want
> to keep it inside of video file.
>
> I already tried OpenCV. Not really happy with it because of codecs
> selection
> and no way to work with subtitles. You can find my questions here.
> http://answers.opencv.org/question/100967/codecs-list/
> http://answers.opencv.org/question/101044/add-subtitles-to-video/
>
> Can you help me please to find a way to do it in GStreamer. Or it is
> a wrong tool for my task?

It all depends on your exact requirements (e.g. is it ok to decoder +
re-encode the video or do you want to pass through and save the encoded
video stream as-is?) and your work flow.

Capturing audio/video from an IP cam, and saving it to a container
format is not a big problem. Adding a text-based subtitle track of some
sort should also not be very doable (without decoding/re-encoding the
video).

Also depends on how you want to process the files later, and with which
applications, if it's all just for internal use or not.

There's KLV metadata for more "structured", standardised, less freeform
metadata. We only support that in MPEG-TS currently.

Cheers
 -Tim

--
Tim Müller, Centricular Ltd - http://www.centricular.com

Join us at the GStreamer Conference: 10-11 October 2016 in Berlin,
Germany
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