get compressed video frame size (x264 or omxh264enc)

[Jake Zhang]

Greetings,

I am looking for a way to get the compressed 264 or 265 video frame size to track the actual output bitrate of my encoders. video-info has frame size but that is in raw image domain. I also tried adding pad probe on encoder src pad but the size I got is still frame size before compression. Does any have idea how to get the compressed video frame size?

Thanks in advance 

Jake

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[Arjen Veenhuizen]

You can add a BUFFER pad_probe on the encoder's src pad and query the GStBuffer size using get_size() in its callback.

[Jake Zhang]

I believe I have tried that and the gst_buffer_get_size() will return the raw video frame size even you polling it on encoder source pad. 

On Wed, Aug 24, 2016 at 1:00 AM, Arjen Veenhuizen <[hidden email]> wrote:

You can add a BUFFER pad_probe on the encoder's src pad and query the
GStBuffer size using get_size() in its callback.



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[Tim Müller]

On Wed, 2016-08-24 at 06:22 -0400, Jake Zhang wrote:

I believe I have tried that and the gst_buffer_get_size() will return the raw video frame size even you polling it on encoder source pad. 

That sounds like a bug in your encoders then.

e.g. see

gst-launch-1.0 videotestsrc ! identity silent=false ! x264enc ! fakesink silent=false -v

shows size in bytes for each buffer going into the encoder (identity) and coming out of it (fakesink).

Cheers

 -Tim

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

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[Jake Zhang]

Thanks Tim and Arjen. I made a silly mistake by adding the probe function on sinkpad instead of srcpad. After fixing that I got the correct compressed video frame size. 

On Wed, Aug 24, 2016 at 6:38 AM, Tim Müller <[hidden email]> wrote:

On Wed, 2016-08-24 at 06:22 -0400, Jake Zhang wrote:

I believe I have tried that and the gst_buffer_get_size() will return the raw video frame size even you polling it on encoder source pad. 

That sounds like a bug in your encoders then.

e.g. see

gst-launch-1.0 videotestsrc ! identity silent=false ! x264enc ! fakesink silent=false -v

shows size in bytes for each buffer going into the encoder (identity) and coming out of it (fakesink).

Cheers

 -Tim

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

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