Opus: Need data for MP4 and WebM containers #6805
Comments
Artoria2e5
changed the title
Test files are provided by chromium: <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Opus Test</title>
<style>
body {
display: flex;
flex-direction: column;
}
</style>
</head>
<body>
Opus in WebM:
<audio controls
src="https://raw.githubusercontent.com/chromium/chromium/main/media/test/data/bear-opus.webm">
</audio>
Opus in MP4:
<audio controls
src="https://raw.githubusercontent.com/chromium/chromium/main/media/test/data/bear-opus.m4a">
</audio>
</body>
</html> |
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Apple officially declared support for Opus in WebM and MP4 in Safari 17 Release Notes:
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Opus in WebM does work on iOS 17.4. Tested on https://hpr.dogphilosophy.net/test/. |
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I wonder if they allow VBR in those containers too -- Opus/CAF support was originally limited to CBR. I should really get a Sonoma machine to test with... |
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@Artoria2e5 as the audio/webm opus file on the sample page used by @nihil-admirari is a not a Hard-CBR file I'd think so. The sample file to test variable frame size (not to be confused with bitrate) at WebKit/WebKit@b41ec21 too is a VBR file Edit: I did test VBR playback successfully on iOS 17.5 and confirmed that the audio-blob regression in 17.4 is gone too |
see docs and discussion at: * https://stackoverflow.com/questions/70143421/webm-and-opus-in-safari * Fyrd#6805 (comment) * Fyrd#7056 (comment) * https://developer.apple.com/documentation/safari-release-notes/safari-17_4-release-notes#Media * https://developer.apple.com/documentation/safari-release-notes/safari-17_5-release-notes#Media
see docs and discussion at: * https://stackoverflow.com/questions/70143421/webm-and-opus-in-safari * #6805 (comment) * #7056 (comment) * https://developer.apple.com/documentation/safari-release-notes/safari-17_4-release-notes#Media * https://developer.apple.com/documentation/safari-release-notes/safari-17_5-release-notes#Media
Opus has an ISOBMFF (MP4) encapsulation defined in 2016. There may be differences in supporting the base Ogg format, in WebM container, and in the MP4/M4A container. MP4 can reasonably used in the <audio> tag: M4A/AAC files are an example.
I know that Opus WebM with up to 2 channels is okay in safari, but Opus Ogg is not okay in Safari at all.
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