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UI: improve aspect ratio handling

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As written in the changelog: Live streams formerly worked around a
Firefox pixel aspect ratio bug by forcing all videos to 16:9, which
dramatically distorted 9:16 camera views. Playback didn't, so anamorphic
videos looked correct on Chrome but slightly stretched on Firefox. Now
both live streams and playback are fully correct on all browsers.
This commit is contained in:
Scott Lamb
2021-08-12 13:32:01 -07:00
parent 115b081dcd
commit 27395ecd4e
13 changed files with 169 additions and 70 deletions
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9
design/api.md
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@@ -333,6 +333,10 @@ the following properties:
section 12.1.4.3 `PixelAspectRatioBox`. If absent, assumed to be 1.
* `pixelVSpacing`: the relative height of a pixel, as in a ISO/IEC 14496-12
section 12.1.4.3 `PixelAspectRatioBox`. If absent, assumed to be 1.
* `aspectWidth`: the width component of the aspect ratio. (The aspect ratio
can be computed from the dimensions and pixel spacing; it's included as a
convenience.)
* `aspectHeight`: the height component of the aspect ratio.
The full initialization segment data for a given video sample entry can be
retrieved at the URL `/api/init/<id>.mp4`.
@@ -584,6 +588,11 @@ Returns a `.mp4` suitable for use as a [HTML5 Media Source Extensions
initialization segment][init-segment]. The MIME type will be `video/mp4`, with
a `codecs` parameter as specified in [RFC 6381][rfc-6381].
An `X-Aspect` HTTP header will include the aspect ratio as width:height,
eg `16:9` (most cameras) or `9:16` (rotated 90 degrees).
This is redundant with the returned `.mp4` but is far easier to parse from
Javascript.
### `GET /api/init/<id>.mp4.txt`
Returns a `text/plain` debugging string for the `.mp4` generated by the