Problem 1: Why does lossless FLAC say "Not Supported" on car stereos?
The audio DAC decoding chips in most car head units max out at 16-bit / 44.1kHz. Export standard 44.1kHz / 16-bit / 320kbps MP3 for 99.9% car stereo compatibility.
Problem 2: Why do track titles and artists show up as garbled text or "???"?
Legacy systems used GBK/CP936 metadata, while modern Linux/Android head units expect UTF-8. Write clean ID3v2.3 tags with standard UTF-8 encoding to fix.
Problem 3: Why does playback volume vary wildly between tracks while driving?
Huge integrated loudness (LUFS) disparities across recording eras. Apply EBU R128 loudness normalization to align target integrated loudness to -16 LUFS.