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https://issues.apache.org/jira/browse/TIKA-4838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18107385#comment-18107385
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ASF GitHub Bot commented on TIKA-4838:
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dschmidt opened a new pull request, #3062:
URL: https://github.com/apache/tika/pull/3062
Adds `audio:format`, the audio track's four-character codec identifier from
the MP4/QuickTime sample description (e.g. `mp4a` for AAC, `alac`, `ac-3`).
`TikaMp4SoundHandler` already reads the sample-entry format fourcc (it uses
it to detect `drms`/`enca` protected streams); this exposes it as metadata. For
protected streams the original codec is recovered from the nested `frma` box,
with `audio:has-drm` still set.
`xmpDM:audioCompressor` only fires for audio-typed files and carries the
container brand, not the per-track codec, so it doesn't cover `video/*` files.
Verified against the M4A test fixture (`mp4a`); metadata schema registries
updated.
https://issues.apache.org/jira/browse/TIKA-4838
Follows TIKA-4779, TIKA-4800 and TIKA-4802.
> Expose the MP4 audio track codec (audio:format)
> -----------------------------------------------
>
> Key: TIKA-4838
> URL: https://issues.apache.org/jira/browse/TIKA-4838
> Project: Tika
> Issue Type: New Feature
> Reporter: Dominik Schmidt
> Priority: Major
>
> The MP4/QuickTime parser already reads the audio sample description's format
> fourcc in TikaMp4SoundHandler, but only uses it to detect protected streams
> (drms/enca → audio:has-drm). The codec itself is not exposed.
> Add an audio:format property carrying the four-character codec identifier
> from the sample entry (e.g. mp4a for AAC, alac, ac-3). For protected streams,
> resolve the original codec from the nested frma (original format) box.
> xmpDM:audioCompressor exists but MP4Parser only sets it for audio-typed files
> and to the container major brand, not the per-track codec, so it does not
> cover video/* files or give the sample-entry fourcc.
> Follows TIKA-4779 (audio:bitrate), TIKA-4800 (frame rate / channels / sample
> size) and TIKA-4802 (video:bitrate).
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