[FFmpeg-user] How to extract core DTS / DCA stream from a DTS 96/24 stream without re-encoding

[Onetel]

I tried that as well but the output is just a duplicate of the DTS 96/24 stream, and has the same low volume problem as the original stream:

command: ffmpeg -i in.dts -bsf:a dca_core -c:a copy -strict -2 out.dts

output:

Input #0, spdif, from 'in.dts':
  Duration: 00:04:49.28, bitrate: 1536 kb/s
    Stream #0:0: Audio: dts (DTS 96/24), 96000 Hz, 5.1(side), fltp, 1536 kb/s
Output #0, dts, to 'out.dts':
  Metadata:
    encoder         : Lavf58.12.100
    Stream #0:0: Audio: dts (DTS 96/24), 96000 Hz, 5.1(side), fltp, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=   53313kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:53313kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%




> On 19 May 2018, at 14:05, Moritz Barsnick <barsnick at gmx.net> wrote:
> 
> On Sat, May 19, 2018 at 13:59:03 +0100, Onetel wrote:
>> Thanks - I tried this but it seems to re-encode rather than copy, taking much longer than “-acodec copy” (which is instantaneous). I tried:
>> 
>> ffmpeg -i in.dts -bsf:a dca_core -strict -2 out.dts
> 
> You need to use both "-c:a copy" *and* "-bsf:a dca_core".
> 
> Cheers,
> Moritz
> 
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