Linux/AM5726: Changing Ducati H.264 encoder bitrate at runtime

Prerak Patel

Part Number: AM5726

Tool/software: Linux

Hello,

I have make gstreamer application, which takes input from v4l2src , crop it through videocrop element , encode it through ducatih264enc and display it over RTSP.

I can change croping data at run time through "g_object_set (G_OBJECT (element->video_crop), "left", crop_height, "right", crop_width, NULL);".

as i am going to change bitrate using "g_object_set (G_OBJECT (element->ducatih264enc), "bitrate", 4096, NULL);", it does not effect on rtsp.

Any solution for this.

Regards,

Prerak

over 7 years ago

0 Margarita Gashova over 7 years ago

TI__Guru* 80190 points

Hello,

What you mean by "going to change bitrate"? Do you mean that you want to change the bitrate when the pipeline is in playing state?

This g_object_set (G_OBJECT (element->ducatih264enc), "bitrate", 4096, NULL); seems correct.

BR
Margarita

0 Margarita Gashova over 7 years ago in reply to Margarita Gashova

TI__Guru* 80190 points

Hello,

Keep in mind that the dynamic configuration of encoder properties is not supported.

BR
Margarita

0 Prerak Patel over 7 years ago in reply to Margarita Gashova

Expert 2230 points

Hi,

Yes i want to change Bitrate when the pipeline is in playing state.

as you are saying , "dynamic configuration of encoder properties is not supported" any solution to change bitrate.
I dont mind if i want to restart the pipline. but some how i am not able to restart the pipeline.

Regards,
Prerak

0 Margarita Gashova over 7 years ago in reply to Prerak Patel

TI__Guru* 80190 points

Hello,

You could try to dynamically unlink the encoder element and the elements after it(set the new properties) and relink them again. But in this case few frames will be lost.

How you are trying to restart the pipeline. Do you mean that you are stopping it and starting it again with the new configuration?

BR
Margarita

0 Prerak Patel over 7 years ago in reply to Margarita Gashova

Expert 2230 points

Hi,

i set pipeline to null state , change the element property and start again with new configuration.

Regards,
Prerak

0 Margarita Gashova over 7 years ago in reply to Margarita Gashova

TI__Guru* 80190 points

I am sorry I forgot in first case the encoder element should be not only unlink, it should be destroyed also and recreated it again.

BR
Margarita

0 Margarita Gashova over 7 years ago in reply to Prerak Patel

TI__Guru* 80190 points

Hello,

Prerak Patel said:
i set pipeline to null state , change the element property and start again with new configuration.

After moving pipeline to NULL state do you unref the pipe ?

gst_object_unref (pipeline);

BR
Margarita

0 Prerak Patel over 7 years ago in reply to Margarita Gashova

Expert 2230 points

Hi,

Yes, i do gst_object_unref (pipeline);. I think, problem should we with app sink element.
i have made application of below pipeline.

v4l2src --tee -- queue -- videocrop-- ducatih264enc -- rtspserver -- fakesink
-- queue -- appsink
i am doing pipeline null in appsink callback function. may be it causes error.

Regards,
Prerak

0 Margarita Gashova over 7 years ago in reply to Prerak Patel

TI__Guru* 80190 points

Hello,

What about if you move to Null state outside this callback?

BR
Margarita

0 Prerak Patel over 7 years ago in reply to Margarita Gashova

Expert 2230 points

Hi,

it works fine for me.

Regards,
Prerak

0 Margarita Gashova over 7 years ago in reply to Prerak Patel

TI__Guru* 80190 points

Hello,

So the issue is solved right?

BR
Margarita

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Linux/AM5726: Changing Ducati H.264 encoder bitrate at runtime