[Linphone-developers] bitrate used for codecs vs available bandwidth

[Vincent Nguyen]

Hello guys,

I have an issue here and I do not understand the logic.

If I initiate a call with :
audio codec = speex32 vbr=on
video codec = h264

if I do not set the max up/down bandwidth and leave it to zero, then the 
upstream audio max out at 24 kbps (see below the log)

if I set the max up/down bandwidth at 1500 or 2000 for instance, then 
the audio max out at 40 kbps

the quality difference is huge.


HOW to explain the 6th line of the log below which triggers this.

thanks



message: 2015-06-17 17:55:23:494 Call 02C1BED0: moving from state 
LinphoneCallOutgoingProgress to LinphoneCallConnected
message: 2015-06-17 17:55:23:494 Linphone core [018BFCE8] notifying 
[call_state_changed]
message: 2015-06-17 17:55:23:497 Call 02C1BED0 is locking sound resources.
message: 2015-06-17 17:55:23:498 Linphone core [018BFCE8] notifying 
[display_status]
message: 2015-06-17 17:55:23:498 linphone_call_start_media_streams() 
call=[02C1BED0] local upload_bandwidth=[0] kbit/s; local 
download_bandwidth=[0] kbit/s
message: 2015-06-17 17:55:23:498 Audio bandwidth for this call is 24
message: 2015-06-17 17:55:23:498 RtpSession [02C9C120] sending to rtp 
[10.0.1.142:16894] rtcp [10.0.1.142:16895]
message: 2015-06-17 17:55:23:498 Stun packet sent for session [02C9C120]
message: 2015-06-17 17:55:23:498 ms_filter_unlink: 
MSRtpRecv:02BFC078,0-->MSVoidSink:02BFC0B8,0
message: 2015-06-17 17:55:23:498 speex_lib_ctl init without neon
error: 2015-06-17 17:55:23:498 No such filter with id 117
message: 2015-06-17 17:55:23:498 target bitrate not set for stream 
[02CCDDD8] using payload's bitrate is 24000
message: 2015-06-17 17:55:23:498 Setting audio encoder network bitrate 
to [24000] on stream [02CCDDD8]
message: 2015-06-17 17:55:23:498 MSSpeexEnc: got ptime=20
message: 2015-06-17 17:55:23:498 MSSpeexEnc: got ptime=20
message: 2015-06-17 17:55:23:498 Equalizer rate: 8000, selecting 128 
steps for FFT
message: 2015-06-17 17:55:23:498 Equalizer rate: 32000, selecting 512 
steps for FFT
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSWinSndRead:02BFC078,0-->MSVolume:02BFBE78,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSVolume:02BFBE78,0-->MSAudioMixer:02BFC678,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSAudioMixer:02BFC678,0-->MSSpeexEnc:02BFC5B8,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSSpeexEnc:02BFC5B8,0-->MSRtpSend:02BFBFB8,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSRtpRecv:02BFC538,0-->MSSpeexDec:02BFC5F8,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSSpeexDec:02BFC5F8,0-->MSDtmfGen:02BFC578,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSDtmfGen:02BFC578,0-->MSVolume:02BFC638,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSVolume:02BFC638,0-->MSTee:02BFC738,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSTee:02BFC738,0-->MSEqualizer:02BFC778,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSEqualizer:02BFC778,0-->MSAudioMixer:02CD9FD8,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSFilePlayer:02CDA018,0-->MSResample:02CDA058,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSResample:02CDA058,0-->MSAudioMixer:02CD9FD8,1
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSAudioMixer:02CD9FD8,0-->MSWinSndWrite:02BFC0B8,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSAudioMixer:02BFC678,1-->MSAudioMixer:02BFC6F8,0
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSTee:02BFC738,1-->MSAudioMixer:02BFC6F8,1
message: 2015-06-17 17:55:23:498 ms_filter_link: 
MSAudioMixer:02BFC6F8,0-->MSFileRec:02BFC6B8,0
message: 2015-06-17 17:55:23:517 Setting maxbitrate=8000 to speex encoder.
message: 2015-06-17 17:55:23:517 Using bitrate 7550 for speex encoder, 
ip bitrate is 23200
message: 2015-06-17 17:55:23:517 Initializing speex resampler in mode 
[voip]
message: 2015-06-17 17:55:23:522 Filter MSRtpRecv is already being 
scheduled; nothing to do.
message: 2015-06-17 17:55:23:522 MSVolume set gain to [0,000000 db], 
[1,000000] linear
message: 2015-06-17 17:55:23:522 Setting video size 352x288 on stream 
[02C1C438]
message: 2015-06-17 17:55:23:522 linphone_call_start_video_stream lc 
rotation:0