如果 AMR 是丢失的, 和 MP3 是无损失的( 例如 MP3 {WAV), MP3 并不比 AMR 更好, 您无法收回已经丢弃的信息。 如果 AMR 是无损失的, MP3 是丢失的, MP3 代码压缩; 在 192 kbps, 多数内容的结果是透明的 。
Does the AMR to MP3 converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, and album art are read from the AMR container and written into the MP3 container where the format supports tags. All common targets (MP3, AAC, FLAC, OGG) handle tags fine; raw WAV does not.
我可以批量转换成 AMR 成百上千个文件 MP3 吗?
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Yes — drop a folder of AMR files in and we process them in parallel. Premium has more parallel workers and no per-file size cap, so a 500-file batch finishes in minutes rather than tens of minutes.
Will the MP3 keep the same sample rate as AMR?
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默认是 。 - 48 kHz AMR 保留48 kHz在 MP3 中。 如果您需要降为兼容性样本( 96 kHz 44.1 kHz 用于 CD 燃烧), 样本率选项将在同一编码通行证中采用高质量的重新取样。
Yes — uploaded AMR files are processed in isolated workers and deleted within minutes. We never play back, store long-term, or share the audio content. The full retention window is in /privacy/.
转换一个 1小时 AMR 到 MP3 需要多久?
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Same-codec re-mux: 10 to 30 seconds. Re-encode to a different codec: typically 10 to 20% of source duration, so a 1-hour AMR → MP3 finishes in 6 to 12 minutes. Batch jobs parallelize across workers for further speedups.
Why is the MP3 louder or quieter than the AMR source?
If the AMR download is unprotected (no DRM), yes. DRM-encrypted streams (Spotify, Apple Music tracks) are encrypted at the bit level and we cannot process them. Bandcamp, SoundCloud downloads, personal recordings, and podcast files convert cleanly.
