qt targa: unreadable video encoded with alpha channel

[NNois]

ffmpeg version N-86482-gbc40674

Hi if I encode a movie in the targa format with the bgra profile the movie is unreadable by every software using quicktime as a backend.
Movie is perfectly readable by mpv thought but that's not helping us ;-)

the command line used is
-r 25 -vcodec targa -pix_fmt bgra -metadata:s encoder="TGA" -vendor apl0 -acodec pcm_s16le -f mov'

I link below a source file and an "unreadable movie and a working one encoded by the quicktime codec.

If it's a regression anybody is able to tell us which build is ok ?

It's going to be a problem for us because like I've reported last week the prores encoder fail with an alpha channel, the dnxhd too, there is none of the "VFX" industry video codec working with an alpha channel with ffmpeg ;-)

Best regards

[NNois]

there's 3 movies, one source with an alpha, a second encoded by quicktime (workin), a third with ffmpeg which is not working in Quicktime based applications like every Adobe software Avid or Apple but it's working in mpv

[Elon Musk]

What was issue with prores alpha channel?

[NNois]

Hi,
that is ​https://trac.ffmpeg.org/ticket/6466#comment:2

[Carl Eugen Hoyos]

For valid tickets, the command line you tested together with the complete, uncut console output are always required. In this case, the reason is that I fail to produce files with FFmpeg such as the one you attached: The 18th byte of the targa image is always different for me.