Setting libvpx codec of cfg.rc_target_bitrate

When REMB packet is received, the target bitrate is unpacked and set as vpx codec’s configuration, just like below.

https://github.com/aiortc/aiortc/blob/0310cd8486b38d8d8f295650253224247c43ed42/aiortc/codecs/vpx.py#L324-L326 https://github.com/aiortc/aiortc/blob/0310cd8486b38d8d8f295650253224247c43ed42/aiortc/codecs/vpx.py#L262-L264 (p.s I made sure __update_config() is called every time, fixing self.__update_config_needed to be always True )

I wanted to see if the vpx codec actually reflects the new cfg.rc_taget_bitrate, thus I saved the image and re-encoded to video to see the result.

However, the quality of the image/video is always same regardless of cfg.rc_target_bitrate change. I even tried setting all cfg.rc_target_bitrate as just 1kbps (just like below), expecting very low quality video,

DEFAULT_BITRATE = 1000 # 1 kbps
MIN_BITRATE = 1000 # 1 kbps MAX_BITRATE = 1000 # 1 kbps

but the result quality of image/video is always same. Can I get any help? How can I make sure vpx changes the bitrate according to its cfg.rc_target_bitrate ?

[Tjoppen]

I can also confirm this. Setting self.cfg.rc_max_quantizer to a lower value like 10 increases bitrate but setting self.cfg.rc_target_bitrate to any value does nothing. This makes me suspect cfg isn’t being used properly.

[DerGenaue]

Can confirm this. We have an example test that adds bitrate configuration to the aiortc server example and bitrate configuration works fine for h264 but doesn’t work for vpx: https://github.com/Roboy/webrtc-tests/tree/main/aiortc-test