Hi Don,
> No, Ralph, I didn't request the AD version, but that's what I got by
> default.
>
> From what I can see on the iPlayer website, only audiodescribed
> versions are available. Playing using VLC doesn't play the AD.
VLC has no choice but to play the single audio stream in the MP4 file.
Whether technical or audiodescribed, there is only one audio stream
present.
$ ffprobe -i
His_Dark_Materials_Series_1_-_08._Betrayal_m000csdk_technical.mp4 |&
> grep Audio
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 127 kb/s (default)
$ ffprobe -i
His_Dark_Materials_Series_1_-_08._Betrayal_m000csdk_audiodescribed.mp4 |&
> grep Audio
Stream #0:1(eng): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 96 kb/s (default)
So I don't know how VLC is avoiding reading out the audio descriptions
unless it's not actually an audiodescribed download that was obtained.
get_iplayer could obtain both audio streams and put them in one MP4 file
along with the video, and VLC and other players could then present the
choice of audiodescribed or not, just as foreign-language dubbing is
sometimes present in non-iPlayer material.
--
Cheers, Ralph.
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