![]() ![]() The amp works fine with that, but it is clearly also capable of detecting and decoding IEC 61937 encoded audio when received in a HDMI stereo PCM stream.įor your information, the amp's EDID audio capabilities are listed as follows: I don't believe that omxplayer -p packetises to IEC 61937 format for transmission over HDMI, certainly there isn't anything within its own code doing that, instead sending the encoded audio in raw form in the same way as MLP/Dolby TrueHD/DTS HD etc. I have no way of seeing what samples the amp is receiving to be able to tell if they have had any (even if very small) gain or other modifications applied to them. ![]() It is as if there is a flag set on the Pi's HDMI PCM transport which is stopping the amp from decoding the audio, a flag which isn't there in the Mac's HDMI output. Playing the file to a USB S/PDIF device connected to the 'Pi and to the same amp, using aplay, works fine. I've also tried playing a IEC 61937 raw PCM file (not wav) with an adapted hello_audio copy, again just noise is heard. The hello_audio example doesn't use a decoder component and so the PCM, DDP and DTS bitstream effectively is passed through unmodified. I have checked the passthrough option of omxplayer, it is just to effectively annul the operation of the decoder component. ![]()
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