play media command failing (mr 12.5.1)

[Pete Kelly]

Hi

I am attempting to play a file into a call which is being recorded. The call is AMR-WB and the file is a wav, however this error presents in the logs:

rtpengine[2192078]: INFO: [19f.51567b07]: [control] Received command 'play media' from 10.215.18.6:46658
rtpengine[2192078]: ERR: [19f.51567b07]: [ffmpeg] av_log: Value -1.000000 for parameter 'osr' out of range [0 - 2.14748e+09]
rtpengine[2192078]: ERR: [19f.51567b07]: [ffmpeg] av_log: Failed to set option
rtpengine[2192078]: ERR: [19f.51567b07]: [core] Error resampling: failed to alloc resample context
rtpengine[2192078]: ERR: [19f.51567b07]: [core] Resampling failed

Any ideas of what I could check to look into this? The recording is working fine so I am assuming rtpengine has no issues encoding/decoding the stream

[Pete Kelly]

Would this bear some relation to https://github.com/sipwise/rtpengine/issues/1841

?

[Pete Kelly]

I've tried 13.1.1 and the change relating to 1841 but it has no effect. It seems like it's something simple but not sure where to look!

[Richard Fuchs]

"osr" is the output sampling rate, and this is coming from ffmpeg. Is media playback a general problem for you, or just towards AMR-WB? What did the SDP exchange from that client look like? What format (sampling rate, channels) does the input file have?

Cheeres

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[Pete Kelly]

Hi

PCMU/PCMA works fine with the file (for the same call scenario).

The file is a regular wav, 16bit 44100 Hz

Pete

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[Pete Kelly]

Oops, forgot to mention the call is negotiated as 

a=rtpmap:104 AMR-WB/16000 a=fmtp:104 mode-change-capability=2;max-red=220

Pete

[Pete Kelly]

Hi Richard

No problems normally with injecting media, It works fine with PCMU/PCMA, this is the file spec:

RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 44100 Hz

SDP looks like this:

offer:

m=audio 10134 RTP/AVP 104 110 102 108 8 0 105 100 b=AS:80 b=RS:625 b=RR:1875 a=ptime:20 a=maxptime:240 a=sendrecv a=rtpmap:104 AMR-WB/16000 a=fmtp:104 mode-change-capability=2;max-red=220 a=rtpmap:110 AMR-WB/16000 a=fmtp:110 octet-align=1;mode-change-capability=2;max-red=220 a=rtpmap:102 AMR/8000 a=fmtp:102 mode-change-capability=2;max-red=220 a=rtpmap:108 AMR/8000 a=fmtp:108 octet-align=1;mode-change-capability=2;max-red=220 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:105 telephone-event/16000 a=fmtp:105 0-15 a=rtpmap:100 telephone-event/8000 a=fmtp:100 0-15

answer:

m=audio 10352 RTP/AVP 104 105 c=IN IP4 x.x.x.x b=AS:29 b=RR:1087 b=RS:362 a=maxptime:240 a=rtpmap:104 AMR-WB/16000 a=fmtp:104 mode-change-capability=2;max-red=220 a=rtpmap:105 telephone-event/16000 a=fmtp:105 0-15 a=sendrecv a=ptime:20

[Richard Fuchs]

I can't really reproduce this using a similar call setup. It could be related to ffmpeg. Which platform (distro/version) is this on, and what version are your ffmpeg library packages?

If you're willing to experiment, you can add a logging line to lib/resample.c which prints the value of `to_format->clockrate` and see what it contains.

Cheers

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[Pete Kelly]

Hi

I’ve just tried testing the injection with a few other wav/mp3 files saved in different formats and it gives the same error each time so it seems to be AMR-WB related

ERR: [dd2.74a46804]: [ffmpeg] av_log: Value -1.000000 for parameter 'osr' out of range [0 - 2.14748e+09]

ERR: [dd2.74a46804]: [ffmpeg] av_log: Failed to set option

ERR: [dd2.74a46804]: [core] Error resampling: failed to alloc resample context                                                                                                   ERR: [dd2.74a46804]: [core] Resampling failed

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[Pete Kelly]

Absolutely willing to experiment 🙂

I’ll try the lib/resample.c mod

This is Ubuntu 24.04 with the following ffmpeg

ffmpeg -version

ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers

built with gcc 13 (Ubuntu 13.2.0-23ubuntu3)

configuration: --prefix=/usr --extra-version=3ubuntu5 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared

libavutil      58. 29.100 / 58. 29.100

libavcodec     60. 31.102 / 60. 31.102

libavformat    60. 16.100 / 60. 16.100

libavdevice    60.  3.100 / 60.  3.100

libavfilter     9. 12.100 /  9. 12.100

libswscale      7.  5.100 /  7.  5.100

libswresample   4. 12.100 /  4. 12.100

libpostproc    57.  3.100 / 57.  3.100

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[Pete Kelly]

-               if (!resample->swresample)

+               if (!resample->swresample) {

+                       ilog(LOG_ERR | LOG_FLAG_LIMIT, "PKDEBUG CLOCKRATE: %d", to_format->clockrate);

                        goto err;

+               }

This is the result:

[core] PKDEBUG CLOCKRATE: -1

[Richard Fuchs]

Check the output of `rtpengine --codecs`

I suspect you will see

              AMR-WB: supported for decoding only

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[Pete Kelly]

You are correct sir 🙂 (whoops)

I assume this is something I can rectify by recompiling ffmpeg with the encoder?

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[Richard Fuchs]

It's much simpler in fact. You can just install the package `libavcodec-extra` and that will give you full support.

There's also a booboo in the code that prevents it from producing an appropriate log message, saying that no supported codec is present. Fixes for this are coming soon, but this is mostly a cosmetic issue.

Cheers

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[Pete Kelly]

Thanks for that! I feel very silly now and am off to hide under a rock 😕 

Pete

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