Convert OGA to CAF — Free Online Tool
Convert OGA audio files (Ogg-encapsulated Vorbis or FLAC) to CAF, Apple's Core Audio Format, with PCM 16-bit lossless output — ideal for integrating open-format audio into Apple development workflows, Logic Pro, or GarageBand. The conversion decodes the Vorbis or FLAC stream and re-encodes it as uncompressed PCM, giving you a universal baseline for further processing in Apple's audio ecosystem.
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FFmpeg Command
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
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DownloadHow It Works
OGA files typically contain either Vorbis-encoded lossy audio or FLAC lossless audio wrapped in the Ogg container. CAF does not support Vorbis or the Ogg container natively in most Apple tools, so FFmpeg decodes the audio stream entirely — decompressing Vorbis to raw PCM or unpacking FLAC — and re-encodes it as 16-bit signed little-endian PCM (pcm_s16le) inside the CAF container. This means the output is fully uncompressed and immediately compatible with Core Audio APIs, Logic Pro, GarageBand, and iOS/macOS audio frameworks. If the source was Vorbis, this transcoding step introduces no further quality loss beyond what was already present in the original lossy file. If the source was FLAC, the output will be a bit-perfect 16-bit representation of the lossless content. Note that the -b:a 128k flag is present in the command but has no practical effect on PCM streams, since PCM audio is uncompressed and does not use bitrate-based encoding.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary — the open-source multimedia processing engine that handles decoding the Ogg/Vorbis or Ogg/FLAC stream from the OGA file and re-encoding it as PCM inside the CAF container. |
-i input.oga
|
Specifies the input file — an OGA audio container, which FFmpeg automatically probes to detect whether it contains a Vorbis, FLAC, or Opus stream before selecting the appropriate decoder. |
-c:a pcm_s16le
|
Sets the output audio codec to 16-bit signed little-endian PCM, which is the standard uncompressed audio format used by Apple's Core Audio framework and compatible with Logic Pro, GarageBand, and AVFoundation without any additional decoding overhead. |
-b:a 128k
|
Attempts to set a target audio bitrate of 128 kbps, but this flag has no effect on PCM output because uncompressed PCM audio does not use bitrate-based encoding — its bitrate is determined entirely by sample rate, bit depth, and channel count. It is safe to omit this flag when using pcm_s16le. |
output.caf
|
Specifies the output filename and triggers FFmpeg to write the result in Apple's Core Audio Format container, which supports large files beyond the 4GB limit of WAV/AIFF and is the preferred container for PCM audio in Apple development and production environments. |
Common Use Cases
- Bringing open-source game audio assets (distributed in OGA/Vorbis format by platforms like OpenGameArt.org) into Xcode or an iOS audio project that requires Core Audio-compatible files
- Importing a podcast or audiobook master recorded in OGA/FLAC into Logic Pro or GarageBand, which do not natively open Ogg containers
- Preparing OGA music files sourced from Bandcamp or Jamendo for use in an AVFoundation-based macOS or iOS app that requires CAF or PCM input
- Converting Vorbis-encoded OGA speech recordings to uncompressed CAF for use in Apple's Speech framework or Core ML audio pipelines where raw PCM is preferred
- Archiving open-format OGA audio in CAF/PCM for long-term storage in an Apple-centric production environment, ensuring format compatibility without lossy re-compression
- Enabling a sound designer to use Creative Commons OGA sound effects inside a Final Cut Pro X project by converting them to Apple's native CAF container
Frequently Asked Questions
If your OGA file contains a Vorbis stream (lossy), the audio has already been lossy-compressed. Converting it to uncompressed PCM inside CAF will not add any further quality loss — you are simply decompressing the Vorbis data to its decoded state. However, you cannot recover quality that was discarded when the file was originally encoded to Vorbis. If your OGA contains FLAC audio (lossless), the conversion to 16-bit PCM is entirely lossless provided the original content was already 16-bit.
The default audio codec for CAF in this tool is pcm_s16le (16-bit signed little-endian PCM), which is the most universally compatible choice for Apple's Core Audio framework. PCM ensures that no secondary lossy compression is applied on top of already-decoded audio, which is especially important when the source is FLAC. If you want a smaller CAF file using AAC, you can modify the FFmpeg command by replacing -c:a pcm_s16le with -c:a aac and adjusting the -b:a value accordingly.
OGA files can carry Vorbis Comment metadata tags (such as artist, album, and title), but CAF has limited metadata support compared to formats like M4A or MP3. FFmpeg will attempt to map basic tags during conversion, but chapter markers from the OGA file will not be preserved, as CAF does not support chapters. You should verify that any critical metadata survived the conversion using a tool like MediaInfo or afinfo on macOS.
To output FLAC inside CAF, replace -c:a pcm_s16le with -c:a flac and remove the -b:a 128k flag, since FLAC is lossless and does not use a bitrate target. To output AAC, replace -c:a pcm_s16le with -c:a aac and keep -b:a at your desired value such as 192k or 256k. For example: ffmpeg -i input.oga -c:a aac -b:a 192k output.caf. AAC will significantly reduce file size compared to PCM while maintaining good perceptual quality.
Yes. On macOS or Linux, you can use a shell loop to process multiple files: for f in *.oga; do ffmpeg -i "$f" -c:a pcm_s16le -b:a 128k "${f%.oga}.caf"; done. On Windows PowerShell, use: Get-ChildItem *.oga | ForEach-Object { ffmpeg -i $_.FullName -c:a pcm_s16le -b:a 128k ($_.BaseName + '.caf') }. This is particularly useful for batch-converting OGA game audio libraries or sound effect packs for use in Apple development projects.
This is expected. OGA files with Vorbis audio are lossy-compressed and store only the frequency-domain coefficients needed to reconstruct the audio — a typical Vorbis file at quality 4 might use around 128 kbps. PCM audio in CAF stores every sample as raw digital values with no compression, which for 16-bit stereo audio at 44.1 kHz results in approximately 1,411 kbps — roughly 10–11 times larger. If file size is a concern, consider using -c:a aac in the FFmpeg command to get a compressed CAF output that Apple tools still support natively.
Technical Notes
The OGA container is essentially an Ogg file restricted to audio-only streams, most commonly holding Vorbis (lossy, quality-based encoding from q0 to q10) or FLAC (lossless). Neither codec is natively supported in Apple's Core Audio framework or common Apple DAWs without third-party plugins, which makes OGA files incompatible with many Apple workflows out of the box. CAF, designed by Apple to supersede AIFF and WAV for large file support and multi-codec flexibility, is natively readable by Core Audio, AVFoundation, Logic Pro, GarageBand, and Xcode audio tools. The pcm_s16le codec used here produces standard CD-quality 16-bit PCM, which is bit-identical to WAV or AIFF PCM content and imposes no maximum file size limit thanks to CAF's 64-bit chunk size support. One known limitation is that the Ogg container's channel mapping for multichannel audio differs from standard channel ordering, though OGA files are almost always mono or stereo. Also note that the -b:a 128k flag in the command is a no-op for PCM output — it is included by the tool's default template but PCM encoding ignores bitrate targets since it stores every sample uncompressed. Metadata preservation from Vorbis Comments to CAF metadata atoms is partial; tags like title, artist, and album may carry over, but custom or extended tags may be dropped during the container remux.