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+====== Volume Adjustment and Dynamic Range Compression using dynaudnorm and compand ======
+Normally, dynamic range compression is bad. Makes music sound lifeless. However, I hate adjusting volume between and during tracks when I'm walking. \\
+Normalization takes care of consistent volume across tracks but not sudden jumps or louder rms.
+Dynaudnorm can essentially vary the volume throughout a track based on the peak volume, without losing range.
+For most uses, only use dynaudnorm, don't even add the compand. My use here is more aggressive and will change volumes much faster as well as compress range a bit (hopefully without distorting too much). \\
+Compand will basically compress the range, and will probably distort, so use with caution, esp when mixing like this.
+In this case, this is literally music for me when I'm walking, and needs to take up minimal space on my phone, so I compress with opus at 64 or even 32 kbit/s. While that would sound like garbage in the mp3 era, 64 is ok, and 32 most certainly artifacts, but still usable, especially with my garbage earbuds from a Samsung Galaxy Q I'm waiting on to stop working.
+Sounds bad? yes. but at least I don't have to reach into my pocket to change volumes every minute.
+(Parallel is just used so I can batch process on my system).
+<code>
+parallel --ungroup -j30 -q -a /tmp/files ffmpeg -i "{}" -filter_complex "[0:a]dynaudnorm=framelen=200:gausssize=11:maxgain=30:targetrms=0.5:altboundary=1:compress=8:correctdc=1[int];[int]compand=attacks=0:points=-80/-900|-45/-15|-27/-9|0/-7|20/-7:gain=4[out]" -map "[out]" -vn -c:a libopus -b:a 32k -vbr on -compression_level 10  -map_metadata 0 -id3v2_version 3 -y "../export/{.}.ogg"
+</code>

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