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I have an MP4 URL with only video and a separate audio track for it. I can play one or the other by changing the "main" stream URL and the corresponding content-type, but I want both, not one or the other obviously.

There is a core URL at (silly video) https://v.redd.it/3hyw7hwoajn21/DASHPlaylist.mpd

You can get the MP4 video only with audio at https://v.redd.it/3hyw7hwoajn21/DASH_720 and its corresponding audio track is at https://v.redd.it/3hyw7hwoajn21/audio

If I play the MP4 with the iOS SDK it works fine, but no audio:

let url = URL(string: "https://v.redd.it/3hyw7hwoajn21/DASH_720")!

let mediaInfoBuilder = GCKMediaInformationBuilder(contentURL: url)
mediaInfoBuilder.contentID = url.absoluteString
mediaInfoBuilder.streamType = .buffered
mediaInfoBuilder.streamDuration = TimeInterval(75)
mediaInfoBuilder.contentType = "video/mp4"
mediaInfoBuilder.metadata = metadata

let mediaInfo = mediaInfoBuilder.build()

So I try to add in the audio track before calling build(), attempting to follow the documentation here:

mediaInfoBuilder.mediaTracks = [GCKMediaTrack(identifier: 98911, contentIdentifier: nil, contentType: "audio/mp4", type: GCKMediaTrackType.audio, textSubtype: GCKMediaTextTrackSubtype.unknown, name: "Fun time fun", languageCode: "en", customData: nil)]

But the result is the same: no audio.

Am I doing this wrong?

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1 回答 1

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音频和视频流必须在同一个清单中，我们才能支持它，否则 SDK 不支持。一般来说，ChromeCast 的硬件仅限于允许一个 mediaElement。有些应用在看书时设法添加音效，可能会使用 WebAudio，但这完全是在应用中完成的。

于 2019-04-08T21:43:27.077 回答