Opened 3 years ago

Closed 3 years ago

#8427 closed defect (duplicate)

DNxHD codec Alpha Channel support (Decode and Encode)

Reported by: NNois Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Hi,
In Broadcast there's 2 format in use Prores (Apple) and DNxHD (Avid).
FFmpeg already support Alpha channel in Prores.mov files.
How far are we to DNxHD support ?
In my Understanding DNxHD never compress the Alpha Channel, is it a Stopper for the Encoder (or the decoder) ?

Here is some test files, one is Prores with an alpha, the other is a DNxHD one

Attachments (2)

dnxhd_with_alpha_straight.mov (1.8 MB ) - added by NNois 3 years ago.
Correctly encoded DNxHD file with an alpha channel not decoded by ffmpeg
prores_with_alpha_straight.mov (1.5 MB ) - added by NNois 3 years ago.
Correctly encoded ProRes file with an alpha channel correctly decoded by ffmpeg

Change History (5)

by NNois, 3 years ago

Correctly encoded DNxHD file with an alpha channel not decoded by ffmpeg

by NNois, 3 years ago

Correctly encoded ProRes file with an alpha channel correctly decoded by ffmpeg

comment:1 by NNois, 3 years ago

To encode a dnxhd file (without alpha channel support)

ffmpeg.exe -y -i file.png -c:v dnxhd -profile:v dnxhr_sq -b 120M -pix_fmt yuv422p test.mov

comment:2 by NNois, 3 years ago

Keywords: dnxhd alpha added

comment:3 by Carl Eugen Hoyos, 3 years ago

Keywords: dnxhd alpha removed
Resolution: duplicate
Status: newclosed

See ticket #3707

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