[FFmpeg-devel] Apparently wrong bitdepth set for RGBA PNG in mov

[Robert Krüger]

On Wed, Feb 20, 2013 at 12:20 PM, Robert Krüger <krueger at lesspain.de> wrote:
> Hi,
>
> I transcoded an PNG(RGBA)-Mov sample again into PNG(RGBA)-Mov and the
> resulting file is displayed as RGBA and when I export a png frame from
> the resulting file, transparency is still there. However, when using
> the ffmpeg-generated file in Final Cut, transparency is gone (works
> with original). Comparing the atom structure I saw that the
> ffmpeg-generated file has a depth of 24 in the stsd atom, while the
> original file has 32. Changing the value to 32 in the atom makes FCP
> work with the file as expected.
>
> When I just remux the file, 32 is preserved.

This is now track ticket #2290 with sample.