[Libav-user] Writing prores files?

[Joe Button]

Hi!

I'm trying to write a ProRes file, specifically ProRes 4444 (or maybe 4444  XQ).

As a starting point I grabbed the example here: https://ffmpeg.org/doxygen/6.0/encode_video_8c-example.html

If I build that and do

> ./main output.mp4 libx264

all is good, I get a video file with some swirly visuals. I was hoping it'd be trivial to modify that to output ProRes, but I haven't managed to figure it out. If I do

> ./main output.mov prores_ks

I get:

[prores_ks @ 0x55efb2feb940] Specified pixel format yuv420p is invalid or not supported

So, based on https://unix.stackexchange.com/questions/111886/prores-444-output-using-ffmpeg, I tried with AV_PIX_FMT_YUVA444P10LE. It generated a file, but the file seems to have issues. Opening it with mplayer I get this:

> mplayer output.mov
MPlayer 1.5+svn38423-2build1 (Debian)
do_connect: could not connect to socket
connect: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing output.mov.
libavformat version 60.3.100 (external)
libavformat file format detected.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f19658916a0]moov atom not found
LAVF_header: av_open_input_stream() failed
libavformat file format detected.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f19658916a0]moov atom not found
LAVF_header: av_open_input_stream() failed


Exiting... (End of file)

I also tried adding

     c->profile = FF_PROFILE_PRORES_4444;

but that didn't seem to do much.

In case it matters, I'm using ubuntu 23.10 which has version "7:6.0-6ubuntu1" of libavformat / libavcodec

Any ideas, or even a working example? Any help greatly appreciated, thanks!

Joe