[meta-freescale] Overlay image and Text over video using hardware module in i.mx6

[John Weber]

One consideration is the encode distortion you might see in the text, but in gstreamer is should be possible to overlay text and graphics prior to encode.   That is most likely done in software.  Not sure if the gstreamer elements will do the compositing using the IPU or not.

—
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On Sun, Feb 9, 2014 at 10:04 PM, Sachin Deshpande <3mediatech at gmail.com>
wrote:

> Hello Philip,
> Thanks for the reply.
> The above suggestion  means that I need to do the overlaying at the client
> end. I want  to do this at server i.e. encoder end as I want to multicast
> the stream .
> If I do this at the encoder and multicast the stream then I will not need
> any sync at clients to display the text it will just plain decoding and
> displaying the stream.
> Is there a way to do this or the overlay is possible at client only ?
> Regards,
> Sachin
> On Sat, Feb 8, 2014 at 8:57 AM, Philip Craig <phil at blackmoth.com.au> wrote:
>> On Fri, Feb 7, 2014 at 10:55 PM, Sachin Deshpande <3mediatech at gmail.com>
>> wrote:
>> >
>> > I am new to i.mx6q board.
>> >
>> >
>> > I  am trying to implement the following scenario
>> >
>> >
>> >
>> > 1) Input video stream from STB / IP to server
>> >
>> > 2) Stream the video with periodically overlay Image and Text over the
>> video
>> > and stream
>> >
>> >
>> >
>> > For the above purpose I am doing the overlay using gstreamer.
>> >
>> >
>> > But as the mixing/overlaying  is happening at CPU level the performance
>> for
>> > higher resolution is very poor. Is there a way to perform
>> mixing/overlaying
>> > in hardware so that I can achieve the real-time video.
>>
>> The hardware supports overlaying framebuffers. You can use /dev/fb0 as
>> the background framebuffer for video, and /dev/fb1 as the foreground
>> framebuffer for text, and use alpha in pixel to make the text
>> background transparent. This needs some configuration of /dev/fb1. You
>> need to set the resolution, enable alpha in pixel and unblank the
>> framebuffer. See https://community.freescale.com/thread/303279 for
>> ioctls to do this.
>>
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