[FFmpeg-user] Adaptive Streaming between heaac and lcaac

Ronak ronak2121 at yahoo.com
Fri Jun 22 23:45:40 EEST 2018



>> Hi,
>> 
>> We are trying to setup an adaptive stream across two heaac streams and higher order lcaac ones.
>> 
>> So we’d have something like so:
>> 
>> HEAACv2 44khz/32kbps
>> HEAACv2 44/64
>> LCAAC 44/128
>> LCAAC 44/256
>> LCAAC 44/320
>> 
>> I setup a test stream this way and I’m seeing some problems.
>> 
>> Exoplayer is seeing this stream as not being able to support seamless adaptive switching because the defaultSampleDurations in the HE-AACv2 fMP4's moof boxes is 2048 while the LC-AAC file has 1024.
>> 
>> Why does HE-AACv2 have a higher sample duration when the sampling rate is supposed to be 44100, equivalent to the sampling rate of the LC-AAC audio?
>> 
> 
> 
> Has anyone ever tried to do this before? Is this a problem with how ffmpeg is generating the HEAACv2 fmp4 files?
> 
> 


Could anyone please shed any light on why the defaultSampleDurations in moof are different between LC & HE-AAC at the same sampling rates?



>> Thanks,
>> 
>> Ronak
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