[FFmpeg-trac] #7033(ffmpeg:new): dialnorm is unchanged with AC3 copy

[FFmpeg]

#7033: dialnorm is unchanged with AC3 copy
---------------------------------+----------------------------------
             Reporter:  Mista_D  |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  ffmpeg   |                  Version:  3.4
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+----------------------------------
 dialnorm value change is not working when using -c copy.
 1) ffmpeg -i source.ts -c copy -dialnorm -24 -vf c.copy.ts
 2) ffmpeg -i source.ts -c ac3  -dialnorm -24 -vf  c.ac3.ts

 Audio tool used to show  dilanorm was eac3to (Win/Wine)


 eac3to.exe source.ts
 TS, 1 audio track, 0:05:00
 1: AC3, English, 5.1 channels, 384kbps, 48kHz, dialnorm: -31dB

 eac3to.exe c.copy.ts
 TS, 1 audio track, 0:05:00
 1: AC3, English, 5.1 channels, 384kbps, 48kHz, dialnorm: -31dB

 eac3to.exe c.copy.ts
 TS, 1 audio track, 0:05:00
 1: AC3, English, 5.1 channels, 384kbps, 48kHz, dialnorm: -24dB

 Can dialnorm value be modified by FFmpeg without re-encoding of the AC3
 stream please? Or an error message which would indicate that header
 changes can be only done during re-encoding


 Thank you

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7033>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker