API - Incorrect display of stream AV parameters (left over restrictions from flv legacy specs)

[laurfb]

In Stream (console) page srs report always 44100 as sampling frequency for audio regardless of real value. At the moment srs can manage/recognize only four sampling frequency (5512, 11025, 22050, 44100). Any other sampling feequency, apart from the four mentioned, are displayed as 44100.

Version srs docker v6.x/5.x

To Reproduce push some rtmp stream to srs (OBS/ffmpeg, etc,) like:

ffmpeg -re -i input.mp4 -c:v libx264 -profile:v high -preset:v ultrafast -b:v 8M -c:a aac -ar 48000 -ac 2 -b:a 256k -f flv rtmp://192.168.1.1:1935/live/test

or with any other sampling frequency (48000, 96000, whatever)

Checking outputed stream with ffmpeg/ffprobe/ffplay we got corectly the expected audio sampling frequency:

but srs always display 44100

Expected behavior Display real (detected) value (48000, 96000...).

Additional context Related to this issue: srs doen't display any info about received streams if "srt_to_rtmp" option is set to "off". If "srt_to_rtmp" is set to "on" srs display altered info for video and always "44100" as sampling frequency for audio regardless real input values.

Don't know in this case if this is the expected behavior (no info if "srt_to_rtmp" is set to "off")

To Reproduce Push srt stream to srs:

ffmpeg -re -i input.mp4 -c:v libx264 -profile:v high -preset:v ultrafast -b:v 8M -c:a aac -ar 48000 -ac 2 -b:a 256k -f mpegts srt://192.168.1.1:10080?streamid=#!::r=live/test,m=publish

Check output stream data with:

ffplay srt://192.168.1.1:10080?streamid=#!::r=live/test,m=request or with ffprobe srt://192.168.1.1:10080?streamid=#!::r=live/test,m=request

and compare with info reported by srs

regards, Laur