[FFmpeg-user] Dolby E decoder
fred.bj at free.fr
Mon Sep 11 12:48:45 EEST 2017
>> Looks like you need to resample audio to sample rate ac3 supports.
> I've just tried to convert two different Dolby E source from wav to u8, then ffprobe recognize them as a Dolby E stream, but it says that they're 44800Hz, I guess it should be 48000Hz. Perhaps there's a bug here ?
> But I unfortunately can't use ffplay to play it, there a compilation bug on my fedora 24 box with this last ffmpeg release (very annoying by the way, I must investigate it).
> Also, is it possible to display some more information from the u8 packed Dolby E stream using ffprobe ? When copying from wav to u8, many metadata are displayed, but almost none using ffprobe, perhaps there's an additional argument to add ?
Here are the results of some others tests :
1) Split the Dolby E Stream in Wav container into two mono Wav container > merge both mono Wav container into a stereo Wav container > wrap into u8 raw data
-> Works well and the Dolby E stream is recognized by ffprobe, but still at 44800Hz.
2) Split the Dolby E Stream in Wav container into two mono Wav container > put both mono Wav container into a MXF wrapper with video > extract both mono Wav container from MWF wrapper > merge both mono Wav container into a stereo Wav container > wrap into u8 raw data
> Works well and the Dolby E stream is recognized by ffprobe too, and still at 44800Hz.
Now I need to fix ffplay to play the raw data and check if sound is OK, or if the sample rate mismatch is an issue for it.
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