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flac over 88 khz

Christophe Lampert

October 24, 2014 06:06

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Hello,

I try to read flac file with my raspbery (raspbian wheezy, mpd, hifiberry DAC).
Thé playback is well, but with flac files over 88 khz, the playback from song is accelerated.

I have test the Volumio image, flac playback as well over 88 khz... but I want to use raspbian.

Tanks in advance for you help.
Lampchris

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5 comments

• 0
  
  HiFiBerry team October 24, 2014 07:33

  Hi Chris,
  
  I guess, there is a problem with your mpd configuration. Can you playback the file from command line with "mplayer"?
  
  Best regards
  Daniel
• 0
  
  Christophe Lampert October 24, 2014 13:35

  Hello Daniel,
  
  yes, i kann playback in 192Khz with mplayer:
  --> mplayer -ao alsa:device=hw=1,0 1-Hotel\ California.flac
  
  Terminal screen:
  ----------------------------
  192khz/The Eagles - Hotel California 24bit 192khz $ mplayer -ao alsa:device=hw=1,
  0 2-New\ Kid\ In\ Town.flac
  MPlayer svn r34540 (Debian), built with gcc-4.6 (C) 2000-2012 MPlayer Team
  mplayer: could not connect to socket
  mplayer: No such file or directory
  Failed to open LIRC support. You will not be able to use your remote control.
  
  Playing 2-New Kid In Town.flac.
  libavformat version 53.21.1 (external)
  Mismatching header version 53.19.0
  Audio only file format detected.
  Load subtitles in ./
  ==========================================================================
  Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
  libavcodec version 53.35.0 (external)
  Mismatching header version 53.32.2
  AUDIO: 192000 Hz, 2 ch, s32le, 5236.2 kbit/42.61% (ratio: 654524->1536000)
  Selected audio codec: [ffflac] afm: ffmpeg (FFmpeg FLAC audio)
  ==========================================================================
  AO: [alsa] 192000Hz 2ch s32le (4 bytes per sample)
  Video: no video
  Starting playback...
  A: 26.9 (26.9) of 304.0 (05:04.0) 16.0%
  ---------------------------
  
  Wenn i use the command tvservice -a the 192Khz is not supported:
  PCM supported: Max channels: 2, Max samplerate: 96kHz, Max samplesize 24 bits.
  AC3 supported: Max channels: 6, Max samplerate: 48kHz, Max rate 640 kb/s.
  
  my MPD.conf:
  -------------------
  
  music_directory "/media"
  playlist_directory "/var/lib/mpd/playlists"
  db_file "/var/lib/mpd/mpd.db"
  log_file "/var/log/mpd/mpd.log"
  pid_file "/var/run/mpd/pid"
  state_file "/var/lib/mpd/state"
  sticker_file "/var/lib/mpd/sticker.sql"
  
  user "mpd"
  #user "root"
  
  bind_to_address "192.168.0.22"
  port "6600"
  
  #log_level "default"
  #log_level "verbose"
  
  zeroconf_enabled "yes"
  zeroconf_name "Music Player Deamon"
  
  
  input {
  plugin "curl"
  # proxy "proxy.isp.com:8080"
  # proxy_user "user"
  # proxy_password "password"
  }
  
  
  audio_output {
  type "alsa"
  name "My ALSA Device"
  device "hw:1,0" # optional
  #format "44100:16:2" # optional------> It's working with this parameters, ok but isn't the goal :-)
  mixer_device "hw:1,0" # optional
  mixer_control "PCM" # optional
  #mixer_index "0" # optional
  dsd_usb "yes"
  }
  
  
  #mixer_type "hardware"
  #mixer_type "software"
  mixer_type "disabled"
  
  filesystem_charset "UTF-8"
  id3v1_encoding "UTF-8"
  
  
  decoder {
  plugin "ffmpeg"
  enabled "yes"
  }
  -------------------
  Thank you for you help
  Have a nice end of day
  Christophe
• 0
  
  HiFiBerry team October 24, 2014 14:08

  Dear Christophe,
  
  if I understand it correctly, it works well with mplayer, but not with mpd - right? Unfortunately I don't have experience with MPD. Any MPD cracks here in the forum?
  What happens when you resample everything to 192kHz/32bit?
  
  Best regards
  Daniel
  
  
• 0
  
  bartkl November 22, 2014 15:01

  Hello Daniel,
  
  I'm experiencing the same problem, and have tried your suggestion of resampling everything to 192/32, as well as some other settings. Using alsa as output driver, this is the piece of configuration responsible:
  
  

  audio_output {
          type            "alsa"
          name            "My ALSA Device"
          format          "44100:16:2"
          device          "hw:0,0"
  }

  
  
  
  
  
  So, I can use format to resample if desired.
  
  The results:
  

  
  Playback of 24/192 FLAC.
  
  • no format option specified (no resampling): same symptoms as with 32/192 (seems to default to it)
  
  
  • format "44100:16:2": sounds fine
  
  
  • format "96000:16:2": sounds fine
  
  
  • format "192000:16:2": horrible loud static, inaudbile music
  
  
  • `format "44100:32:2": sounds fine</li>
    <li>`format "96000:32:2": sounds weirdly fastforwarded and stuttering (probably what TS means)
  
  
  • `format "192000:32:2": no sound at all, possible one loud glitch</li>
    </ul>
    
    <ul>
    Playback of 24/96 FLAC.
    <li>no format option specified (no resampling): same symptoms as with 32/96 (see below). It probably (correctly?) defaults to it.</li>
    <li>format "44100:16:2": sounds fine</li>
    <li>format "96000:16:2": sounds fine</li>
    <li>format "192000:16:2": horrible loud static, inaudbile music <strong>and stuttering as opposed to with the other file</strong></li>
    <li>format "44100:32:2": sounds fine</li>
    <li>format "96000:32:2": sounds weirdly fastforwarded and stuttering (probably what TS means)<strong>even more so than the other! it's progress bar shows it's actually playing several seconds per real-time second<strong></li>
    <li>format "192000:32:2": no sound at all
  
  

  
  
  Be sure to compare this to my mplayer findings at http://www.hifiberry.com/forums/topic/mplayer-playback-of-high-quality-audio-distorted/. Especially the 192khz sample rate is a consistent source of trouble.
  
  Hopefully this is useful to you.
  
  Bart
• 0
  
  bartkl November 22, 2014 15:09

  (sorry for the bad markup, but the markup tools on this forum are just awful and unclear and I seem to have reached a maximum amount of edits)