音频体积换算
UpBox优盒工具箱,免费在线音频体积换算:填时长、采样率、位深和声道,算出未压缩 WAV 到底多大,还能反推某个体积上限能录多长时间,录音前先定参数。
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音频参数Audio settings
已换算
算的是未压缩的 WAV(PCM)体积,含 44 字节文件头;MP3、AAC 等有损格式按「码率 × 时长 ÷ 8」另算,同长度通常只有 WAV 的十分之一到二十分之一;立体声是单声道的两倍
本工具所有运算在本地浏览器完成,你的文件、文本不会上传到服务器
工具介绍
录音、做播客、给视频配旁白,最容易踩的坑是无损录了一小时才发现文件两百多兆,传到平台还得转码。 Recording, podcasting or dubbing a video, the usual trap is capturing an hour losslessly and only then noticing the file runs to hundreds of megabytes and still needs transcoding upstream.
先把时长和格式填进去,看体积再定采样率;要控盘子就填一个上限,反推还能录多久。 Enter the length and format first, check the size before fixing the sample rate; if you need to stay inside a limit, enter it and see how much longer you can record.
- WAV 精算Exact WAV sizing
- 反推时长Backwards to length
- 每秒数据量Data rate
- 多格式切换Format switching
使用说明
- 填时长。Enter the duration.
- 选采样率、位深、声道。Pick sample rate, bit depth and channels.
- 看体积与每分钟占用。Read size and per-minute usage.
- 填目标体积反推时长。Enter a target size to see the length.
常见问题
为什么和我看到的文件大小不同?Why does it differ from the file I have?
这里算的是未压缩 WAV 的 PCM 数据量;如果你看到的是 MP3、AAC、FLAC,体积由码率或压缩率决定,数字会小很多。This counts uncompressed WAV PCM data; if your file is MP3, AAC or FLAC the size follows bitrate or compression ratio and will be far smaller.
44 字节头要算吗?Is the 44-byte header counted?
算进去了,标准 WAV 头固定 44 字节,几十兆的文件里几乎可以忽略,但精确到字节时它确实存在。Yes, a standard WAV header is 44 bytes, negligible in a multi-megabyte file but real when you count bytes.
24 bit 比 16 bit 大多少?How much bigger is 24-bit than 16-bit?
正好多一半:同为 48kHz 立体声,16 bit 每秒约 187 KB,24 bit 约 281 KB。Exactly half again as large: at 48 kHz stereo, 16-bit is about 187 KB per second and 24-bit about 281 KB.
有损格式能算吗?Can it handle lossy formats?
不能精确算,请用「码率 × 时长 ÷ 8」手动估;同长度 MP3 128kbps 大约只有 CD 级 WAV 的十分之一。Not precisely; use bitrate times duration over eight instead. A 128 kbps MP3 of the same length is roughly a tenth of CD-quality WAV.