3/26/2023 0 Comments Configure alsa bitperfect![]() In theory setting software volume to max (0.0dB) should not effect sound quality. Some DACs can also indicate the audio format. * Verify that you are really doing bit-perfect playback using MPD's verbose log and /proc/asound/card*/pcm*p/sub*/hw_params. Most popular distributions of Linux (Ubuntu, Mint, Fedora, OpenSuse) to name but a few, use the Pulse Audio Sound Server which, by default, will mix all audio down to 16/44.1 or 48 for movies. ![]() * Don't force MPD to use a specific audio format (settings format, audio_output_format). rizlaw said: You can get bit-perfect audio from Linux without too much difficulty using ALSA. * Don't use software volume (setting mixer_type). * Disable sound processing inside ALSA by configuring a "hardware" device (hw:0,0 or similar). Obey the "format" row, which indicates that the current playback format is 16 bit (signed 16 bit integer, little endian). To verify the format really being sent to the physical sound chip, try:Ĭat /proc/asound/card*/pcm*p/sub*/hw_params However, this does not yet prove bit-perfect playback ALSA may be fooling MPD that the audio format is supported. It falls back to 16 bit, discarding 8 bit. So firefox-esr wouldnt play audio at all but mpv work with bitperfect. If you setup bitperfect, alsa will unable to resample audio (without replace nf). The following README assumes that your device use mpd only. This example shows that a 24 bit file is being played, but the sond chip cannot play 24 bit. Some information about bitperfect audio replay with usb audio interface through alsa via mpd. ![]() ![]() Output: opened plugin=alsa name="An ALSA output" audio_format=44100:16:2 Here are the steps : (a) Click on the Edit menu, then Preferences. To verify if MPD converts the audio format, enable verbose logging, and watch for these lines:ĭecoder: audio_format=44100:24:2, seekable=true Setting Bit-perfect audio is easier in FreeBSD, in Linux there are options like deadbeef with the alsa-plugin output. If the audio format is not supported, MPD attempts to fall back to the nearest supported audio format, trying to lose as little quality as possible. Precondition is a sound chip that supports the audio format of your music files. Naturally, this implies a lossless codec.īy default, MPD attempts to do bit-perfect playback, unless you tell it not to. "Bit-perfect playback" is a phrase used by audiophiles to describe a setup that plays back digital music as-is, without applying any modifications such as resampling, format conversion or software volume. ![]()
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