Opened 7 months ago

Last modified 5 months ago

#10564 new defect

ape: fix decoding of 24-bit ape files (encoded from 24-bit caf)

Reported by: ami_stuff Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no


monkey's audio encoder can encode 24-bit caf files to ape format

currently ffmpeg decodes such ape files to noise

./ffmpeg -i 24_bit_fixed_caf.ape -y out.wav
ffmpeg version N-112010-g1a87a9d82a Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
  libavutil      58. 19.100 / 58. 19.100
  libavcodec     60. 26.100 / 60. 26.100
  libavformat    60. 11.100 / 60. 11.100
  libavdevice    60.  2.101 / 60.  2.101
  libavfilter     9. 11.100 /  9. 11.100
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
Input #0, ape, from '24_bit_fixed_caf.ape':
  Duration: 00:00:06.76, start: 0.000000, bitrate: 1961 kb/s
  Stream #0:0: Audio: ape (APE  / 0x20455041), 48000 Hz, stereo, s32p (24 bit)
Stream mapping:
  Stream #0:0 -> #0:0 (ape (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'out.wav':
    ISFT            : Lavf60.11.100
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
      encoder         : Lavc60.26.100 pcm_s16le
[out#0/wav @ 0x5643addad500] video:0kB audio:1267kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.006014%
size=    1267kB time=00:00:06.72 bitrate=1544.2kbits/s speed= 214x  

Attachments (1)

24_bit_fixed_caf.ape (1.6 MB ) - added by ami_stuff 7 months ago.

Download all attachments as: .zip

Change History (2)

by ami_stuff, 7 months ago

Attachment: 24_bit_fixed_caf.ape added

comment:1 by therentabrain, 5 months ago

I was looking to see if my problem is the same as this problem and I tried playing your sample file. I'm using Windows 10 which maybe doesn't work with CAF files, but I thought I would report what happened.

Winamp plays it as noise, and decoding it with Monkey's Audio results in a WAV that plays the same.

Interestingly, Monkey's Audio says it verifies OK.

The info it shows:
Monkey's Audio 3.99 (Normal)
Format: 48.0 khz, 24 bit, 2 ch
Length: 0:06 (324266 blocks)
Tag: None (0 bytes)

I came here to report that a file of mine was partially turned to seemingly the same kind of noise when decoding from ape to wav. After a bunch of noise blasts, the rest of the file plays fine.

My file's info:
Monkey's Audio 3.88 (Extra High)
Format: 44.1 khz, 16 bit, 2 ch
Length: 5:54 (15625750 blocks)
Tag: None (0 bytes)

Edit: I figured out a bunch more about what caused my issue and put it in as #10696

Last edited 5 months ago by therentabrain (previous) (diff)
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