How do I encode a GIF? (Changing pixel format appears to not work + error when encoding GIF)

[joeyballentine]

Overview

Encoding to GIF does not work, as I get an error about yuv420p not being supported for that format. However, PyAV seems to ignore any attempt I make to overwrite the pixel format of the stream.

Expected behavior

I should be able to save a GIF

Actual behavior

I get an error

Traceback:

[0]     for packet in writer.out_stream.encode(out_frame):
[0]   File "av\stream.pyx", line 153, in av.stream.Stream.encode
[0]   File "av\codec\context.pyx", line 482, in av.codec.context.CodecContext.encode
[0]   File "av\codec\context.pyx", line 291, in av.codec.context.CodecContext.open
[0]   File "av\error.pyx", line 336, in av.error.err_check
[0] av.error.ValueError: [Errno 22] Invalid argument; last error log: [gif] Specified pixel format yuv420p is invalid or not supported

Investigation

I tried several different ways I hoped would be able to override the pixel format, mainly setting stream.pix_fmt = "gif", assuming that would work based on the numpy example. I also tried setting the attribute elsewhere and in the stream options, to no avail.

Research

I have done the following:

• Checked the PyAV documentation
• Searched on Google
• Searched on Stack Overflow
• Looked through old GitHub issues
• [ ] Asked on PyAV Gitter <- this doesn't even work anymore
• [ ] ... and waited 72 hours for a response.

Additional context

Apologies if I've gotten something wrong here. It just seems like the output format does not get overwritten by anything I enter there.

[rkfg]

Use out_pixel_format='rgb8'