[Libav-user] Writing prores files?

[francesco at blt.it]

"moov atom not found" means the problem is on the wrapper, not on the codec.
Nothing changes if you modify codec parameters.
Regards
Francesco




3 febbraio 2024 23:01, "Joe Button" <ml_libav-user at joebutton.co.uk> wrote:

> 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
> 
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