Empty channel in mixed recorded file if option "output-mixed-per-media" is true

[akolo-eng]

rtpengine version the issue has been seen with

git-HEAD-5e14aac1

Used distribution and its version

Red Hat Enterprise Linux 8.10

Linux kernel version used

4.18.0-553.32.1.el8_10.x86_64

CPU architecture issue was seen on (see uname -m)

x86_64

Expected behaviour you didn't see

We have simple siprec call with 2 media streams, no SSRC switching
Mixing-related options of rtpengine-recording:
output-mixed = true
output-single = true
mix-method = channels
output-mixed-per-media = true
mix-num-inputs = 2
We expect to see 2 mono recorded files (one file per media stream) and stereo mixed recorded file where each channel contains audio from corresponding media stream. Generally speaking, we expect the same result as with output-mixed-per-media = false.

Unexpected behaviour you saw

Mono files are OK, in stereo file only one channel has audio from one stream, second channel is empty.

Steps to reproduce the problem

Session with rtpengine created via commands offer/answer (piece of rtpengine log with command content attached), recording started via command "start" (piece of rtpengine log with command content attached).
Attached:

1. Metafile, created by rtpengine
2. Piece of rtpengine log with processing of commands "offer", "answer" and "start recording"
3. Piece of rtpengine-recording log with processing of session for call ID [email protected]

Btw, from rtpengine-recording log is clear that in case of packet from stream with SSRC 0x50a545bf function mix_add() always go to errror exit here
err = "received samples for old re-used input channel";
if (ptr != mix->input_ref[idx])
goto err;
what causes corresponding error log output.

Additional program output to the terminal or logs illustrating the issue

No response

Anything else?

Attached files:
rtpengine_files.zip

[rfuchs]

Increase your mix-num-inputs setting?

[akolo-eng]

Hello No difference - still audio in one channel only. Alex

…

On Mon, Dec 30, 2024, 4:17 AM Richard Fuchs ***@***.***> wrote: Increase your mix-num-inputs setting? — Reply to this email directly, view it on GitHub <#1892 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOL43YQLUBONLL6WJCVSG4T2IE2WLAVCNFSM6AAAAABUI5KSLGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKNRVGQYTAMJUGY> . You are receiving this because you authored the thread.Message ID: ***@***.***>