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It depends on the codec inside the Ogg container. Ogg Vorbis is lossy, while Ogg can also carry FLAC, which is lossless. To know whether a particular file preserves its audio data, identify its codec—not just its “.ogg” extension.
What does “Ogg” mean?
Ogg is a container format: it packages media streams and related information. Vorbis is an audio codec designed to be stored in Ogg. Xiph.Org describes the distinction in its Vorbis FAQ, and its Ogg overview describes Ogg as a container for audio, video, and metadata.
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In casual usage, “an OGG” often means an Ogg Vorbis audio file. Technically, though, Ogg identifies the container, not the compression method. Ogg can carry different formats, including FLAC.
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Is Ogg Vorbis lossless?
No. Vorbis uses lossy compression: it discards some audio data to make the encoded file smaller. Once that information has been discarded, decoding the file cannot reproduce the original audio exactly. Xiph explains this in its Vorbis FAQ, which recommends a lossless format such as FLAC when exact reproduction is needed.
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Can an Ogg file be lossless?
Yes. An Ogg file can contain FLAC audio. In that case, the audio codec is FLAC, not Vorbis, and the audio compression is lossless. Xiph’s FLAC FAQ explains that Ogg FLAC carries FLAC data in an Ogg container; its compressed audio data is the same as in native FLAC and can be converted between the two without re-encoding.
That does not make Vorbis lossless. It means that the same container can hold different codecs with different properties.
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- This module provides SPI interface, control signal lines are led out, with 1 headphone and audio output interface, and 1 microphone for recording
- On-board 3.3V and 1.8V LDO chip AMS-1117, providing a maximum current of 800mA
How can I tell whether my file is lossless?
Check the file’s codec or stream information in a media player, audio editor, or file-inspection utility. Look for the codec name rather than relying on the extension alone:
- Vorbis: lossy audio.
- FLAC: lossless audio, whether stored in a native FLAC file or an Ogg container.
If the application shows only “Ogg” or a “.ogg” extension, that may identify the container without identifying the codec. Consult the specific player’s documentation if you need to confirm that it supports the codec-and-container combination in your file.
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What should I use to keep audio lossless?
Keep or obtain a lossless source such as FLAC. Xiph describes FLAC as lossless compression, and its FLAC features documentation says decoded PCM is bit-for-bit identical to the input supplied to the encoder.
Converting an existing Vorbis file to FLAC does not restore audio information lost during the Vorbis encode. The new file may use lossless compression, but it can preserve only the decoded output of that lossy source—not recreate the original pre-encode audio.
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Is Ogg FLAC better than native FLAC?
Neither is universally better; the useful choice depends on the workflow. Xiph’s FLAC FAQ says native FLAC is probably the better choice for ordinary playback because it is more widely supported and produces smaller files. Ogg FLAC can suit workflows that involve editing the compressed audio or multiplexing audio with video in Ogg.
Those are format-level recommendations, not a guarantee about every current device or app. Check support for the exact file type on the player you intend to use.
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Do Ogg Vorbis files support tags and streaming?
Yes. Xiph’s Vorbis FAQ describes Vorbis comment fields for information such as song and artist names, and says Ogg Vorbis is streamable. Support for particular tags or streaming behavior can still depend on the software or service handling the file.
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