I have been ripping my cds to flac files to play via Plex to Sonos. I have some files which I ripped a few years ago and they play fine. The new files I’ve just ripped will not play and throw an error saying files are not encoded correctly. The only thing I believe different between these files is the compression level used. The older files uses a compression level of 6 when compressing the flac, where as the new files I used compression level 3. When looking at the metadata for these files I also see the older files seem to have album artwork embedded where the new files do not. Other than that I can’t figure out what might be different in how these files have been ripped. They are both 16bit 44100Hz sample rates which is supported on my Sonos.

Here is the stream info for each file.

Working file:

METADATA block #0
  type: 0 (STREAMINFO)
  is last: false
  length: 34
  minimum blocksize: 4096 samples
  maximum blocksize: 4096 samples
  minimum framesize: 14 bytes
  maximum framesize: 13732 bytes
  sample_rate: 44100 Hz
  channels: 2
  bits-per-sample: 16
  total samples: 7948584
  MD5 signature: f6c0d52479bcb3b779b9e8e1e7a35178

Non Working file:

METADATA block #0
  type: 0 (STREAMINFO)
  is last: false
  length: 34
  minimum blocksize: 4096 samples
  maximum blocksize: 4096 samples
  minimum framesize: 2917 bytes
  maximum framesize: 11329 bytes
  sample_rate: 44100 Hz
  channels: 2
  bits-per-sample: 16
  total samples: 30067380
  MD5 signature: f544b1feddbf1460025622975939967f