[PROBLEM] Audio glitches (dropouts, clicks and pops) using USB DAC plugged to Pi Zero W

[pardon]

I've received my first ever RPi yesterday and installed moOde on it as soon as it was out of the box, as I intend to turn in into a portable music player that can be controlled with my phone.

I'm experiencing issues with the setup I intended to use, a Tempotec Sonata HD PRO USB DAC/AMP. It's automatically detected by Moode, it plays very nicely, the + and - buttons on the dongle works, but I get audio glitches from time to time.

I tried setting the CPU governor to 'Performance', set the USB Auto-Mounter to Devmon (as advised for my Pi Zero W), turning the USB (UAC2 Fix), to no avail unfortunately, as the clicks, pops and dropouts still are there.

According to moode utl -m, CPU usage never exceeds 50% even when playing 24/192. What could it be?

Thanks in advance, and great work, moOdee is such a pleasure to use.

[DRONE7]

Has the symptoms of a power supply problem.
What are you using to power the Pi ?  and is the DAC USB-powered from the Pi ?

Quick test, place a powered USB hub between the Pi and the DAC so as to power the DAC independent of the Pi and see if that fixes the problem.

[pardon]

I had my Pi plugged into a Anker Power 20.000mAh Powerbank.

I'm now powering it with the power supply that came directly with the Pi, I'm hearing less drop-outs, but not zero dropouts!

The DAC is a powered directly from the Pi. I've read that the micro-USB on the Pi Zero is directly hooked to the power in, so it shouldn't have any issues powering this small dongle that should draw 100mA top..

I have to say that there are a lot of adapter in between my Pi and the actual DAC: Micro-USB to USB-A – USB A to USB-C, and then USB-C to Micro-USB plugged into the dac. I don't have a Micro-USB to Micro-USB cable, I'm waiting on some shipments to solder one myself. Could it come from this terrible setup?

[DRONE7]

I had my Pi plugged into a Anker Power 20.000mAh Powerbank.

I'm now powering it with the power supply that came directly with the Pi, I'm hearing less drop-outs, but not zero dropouts!

The DAC is a powered directly from the Pi. I've read that the micro-USB on the Pi Zero is directly hooked to the power in, so it shouldn't have any issues powering this small dongle that should draw 100mA top..

Note the conflict here...   You improved the power-supply and things improved but you don't feel that trying further supply experiments will improve things further.

OK, other things to try would be another Pi.    The  Zero is limited in CPU count and ram. 
The DAC is usually recommended for Phone use and they have much more ram and cpu than the Zero.
A Pi 3b idles along at around 5-10% cpu use.
Where are the files you are playing stored ?  Network performance ?

[pardon]

Well, my Pi power consumption NEVER goes above 50% CPU 34% memory when playing music. Could it really be this? I've read about people using USB DAC much more powerful that mine and experiencing no issues with Pi Zeros,
That would be too bad, I picked the Pi Zero to embed it in a music player because it consumes next to no power and could run on battery for a long time.

I'm playing the files stored on the SD Card where moOde is installed (I don't have any other solutions yet)
No network performance issues either.

Could it be a mix up between the Linux audio drivers and my DAC? People tend to have weird pops and crackles with this very model on specific configuration, like on some Windows builds or with some phones for instance, perhaps just a compatibility issue?

[DRONE7]

Play some music till it glitches then post the output from

Code:

sudo tail -f /var/log/mpd/log

Also, do radio streams work without glitches ?

[pardon]

Here's the output

Dec 13 21:38 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 13 21:42 : player: played "SDCARD/03 Below The Clavicle.m4a"
Dec 13 21:48 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 13 21:52 : player: played "SDCARD/01 Airborne Ashes.m4a"
Dec 14 00:46 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 14 00:46 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set

Radio streams glitches too!. Also, glitches are highly irregular, sometimes a few every five seconds, something none for 2 minutes.

[pardon]

Here's the output

Dec 13 21:38 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 13 21:42 : player: played "SDCARD/03 Below The Clavicle.m4a"
Dec 13 21:48 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 13 21:52 : player: played "SDCARD/01 Airborne Ashes.m4a"
Dec 14 00:46 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set
Dec 14 00:46 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, timescale not set

Radio streams glitches too!. Also, glitches are highly irregular, sometimes a few every five seconds, something none for 2 minutes.

Changed settings to Verbose, but did not see any changes in the log when it glitched. But I did something weird at some point:

Code:

   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3122, dts 289970794
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3123, dts 290063673
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3124, dts 290156553
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3125, dts 290249433
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3126, dts 290342313
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3127, dts 290435193
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3128, dts 290528073
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3129, dts 290620952
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3130, dts 290713832
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3131, dts 290806712
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3132, dts 290899592
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3133, dts 290992472
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3134, dts 291085351
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3135, dts 291178231
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3136, dts 291271111
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stream 0, sample 3137, dts 291363991
   Dec 14 00:57 : decoder_thread: probing plugin ffmpeg
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'ftyp' parent:'root' sz: 28 8 52385894
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: ISO: File Type Major Brand: M4A
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'moov' parent:'root' sz: 8066667 36 52385894
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'mvhd' parent:'moov' sz: 108 8 8066659
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: time scale = 44100
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'trak' parent:'moov' sz: 23362 116 8066659
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'tkhd' parent:'trak' sz: 92 8 23354
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'mdia' parent:'trak' sz: 23262 100 23354
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'mdhd' parent:'mdia' sz: 32 8 23254
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'hdlr' parent:'mdia' sz: 34 40 23254
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: ctype=[0][0][0][0]
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: stype=soun
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'minf' parent:'mdia' sz: 23188 74 23254
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'smhd' parent:'minf' sz: 16 8 23180
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'dinf' parent:'minf' sz: 36 24 23180
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'dref' parent:'dinf' sz: 28 8 28
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: Unknown dref type 0x206c7275 size 12
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stbl' parent:'minf' sz: 23128 60 23180
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stsd' parent:'stbl' sz: 88 8 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: size=72 4CC=alac codec_type=1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: audio channels 2
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: version =0, isom =1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'alac' parent:'stsd' sz: 36 8 36
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stts' parent:'stbl' sz: 32 96 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: track[0].stts.entries = 2
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: sample_count=4911, sample_duration=4096
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: sample_count=1, sample_duration=24
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stsc' parent:'stbl' sz: 40 128 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: track[0].stsc.entries = 2
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stsz' parent:'stbl' sz: 19668 168 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: sample_size = 0 sample_count = 4912
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: type:'stco' parent:'stbl' sz: 3292 19836 23120
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 0, offset 7b666b, dts 0, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 1, offset 7b668b, dts 4096, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 2, offset 7b66ab, dts 8192, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 3, offset 7b66cb, dts 12288, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 4, offset 7b66eb, dts 16384, size 32, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 5, offset 7b670b, dts 20480, size 1886, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 6, offset 7b6e69, dts 24576, size 7547, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 7, offset 7b8be4, dts 28672, size 7116, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 8, offset 7ba7b0, dts 32768, size 6921, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 9, offset 7bc2b9, dts 36864, size 6753, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 10, offset 7bdd1a, dts 40960, size 7145, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 11, offset 7bf903, dts 45056, size 6968, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 12, offset 7c143b, dts 49152, size 6892, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 13, offset 7c2f27, dts 53248, size 6878, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 14, offset 7c4a05, dts 57344, size 6800, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 15, offset 7c6495, dts 61440, size 6776, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 16, offset 7c7f0d, dts 65536, size 6648, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 17, offset 7c9905, dts 69632, size 8253, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 18, offset 7cb942, dts 73728, size 7569, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 19, offset 7cd6d3, dts 77824, size 7318, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 20, offset 7cf369, dts 81920, size 7132, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 21, offset 7d0f45, dts 86016, size 7328, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 22, offset 7d2be5, dts 90112, size 7195, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 23, offset 7d4800, dts 94208, size 7298, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 24, offset 7d6482, dts 98304, size 7370, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 25, offset 7d814c, dts 102400, size 7522, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 26, offset 7d9eae, dts 106496, size 7510, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 27, offset 7dbc04, dts 110592, size 7784, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 28, offset 7dda6c, dts 114688, size 8013, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 29, offset 7df9b9, dts 118784, size 7978, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 30, offset 7e18e3, dts 122880, size 8039, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 31, offset 7e384a, dts 126976, size 8181, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 32, offset 7e583f, dts 131072, size 8294, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 33, offset 7e78a5, dts 135168, size 8584, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 34, offset 7e9a2d, dts 139264, size 8567, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 35, offset 7ebba4, dts 143360, size 8817, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 36, offset 7ede15, dts 147456, size 8904, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 37, offset 7f00dd, dts 151552, size 9121, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 38, offset 7f247e, dts 155648, size 9212, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 39, offset 7f487a, dts 159744, size 9773, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 40, offset 7f6ea7, dts 163840, size 9508, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 41, offset 7f93cb, dts 167936, size 9518, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 42, offset 7fb8f9, dts 172032, size 9832, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 43, offset 7fdf61, dts 176128, size 9826, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 44, offset 8005c3, dts 180224, size 9711, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 45, offset 802bb2, dts 184320, size 9818, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 46, offset 80520c, dts 188416, size 9485, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 47, offset 807719, dts 192512, size 9724, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 48, offset 809d15, dts 196608, size 9459, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 49, offset 80c208, dts 200704, size 9521, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 50, offset 80e739, dts 204800, size 9432, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 51, offset 810c11, dts 208896, size 9481, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 52, offset 81311a, dts 212992, size 9820, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 53, offset 815776, dts 217088, size 9662, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 54, offset 817d34, dts 221184, size 9700, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 55, offset 81a318, dts 225280, size 9471, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 56, offset 81c817, dts 229376, size 9708, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 57, offset 81ee03, dts 233472, size 9562, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 58, offset 82135d, dts 237568, size 9526, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 59, offset 823893, dts 241664, size 9623, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 60, offset 825e2a, dts 245760, size 9403, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 61, offset 8282e5, dts 249856, size 9465, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 62, offset 82a7de, dts 253952, size 9124, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 63, offset 82cb82, dts 258048, size 9117, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 64, offset 82ef1f, dts 262144, size 8922, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 65, offset 8311f9, dts 266240, size 8855, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 66, offset 833490, dts 270336, size 8763, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 67, offset 8356cb, dts 274432, size 8625, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 68, offset 83787c, dts 278528, size 8622, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 69, offset 839a2a, dts 282624, size 8634, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 70, offset 83bbe4, dts 286720, size 8719, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 71, offset 83ddf3, dts 290816, size 8784, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 72, offset 840043, dts 294912, size 8581, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 73, offset 8421c8, dts 299008, size 8420, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 74, offset 8442ac, dts 303104, size 8406, distance 0, keyframe 1
   Dec 14 00:57 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex stream 0, sample 75, offset 846382, dts 307200, size 8294,

[DRONE7]

Got a spare sd-card ?

Install Moode to it and replace the existing sd-card in the Pi. Load a few Flac files of varying resolutions, put them on repeat and see if you get glitches.

Not sure what all the 'ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: AVIndex' is about but these are multimedia files with cover art ? What is their origin ?

[pardon]

I was having a few issues with my micro-SD card, such as being able to write files once, but if I wanted to edit it again it stated that I didn't have the permissions.
Whenever this happens I have to unplug the micro-SD from my computer and plug it back in again.

I'll try a different SD-card and report back.