warning messages (forced frame type (5) at 80 was changed to frame type (3)) Solution

I'm making a transcoder and I had a similar issue,
console output

I found out, that if you copy the decoded frame to a new AVFrame and free the old frame, this doesn't appear anymore
new console output

I didn't make a pull request because I tried running the 3_transcoding.c file on my computer and I didn't see this error in the console, and I also don't know if this fix, is what you are looking for, or if it was already fixed

Now, to be honest, this was harder than I thought it'd be and I had to dig into the FFmpeg command line source code and test it a lot and I think I'm missing something because I had to enforce force-cfr for the h264 to work and I'm still seeing some warning messages like warning messages (forced frame type (5) at 80 was changed to frame type (3)).

C code copyFrame function snippet

int copyFrame(AVFrame* oldFrame, AVFrame* newFrame)
{
	int response;
	newFrame->pts = oldFrame->pts;
	newFrame->format = oldFrame->format;
	newFrame->width = oldFrame->width;
	newFrame->height = oldFrame->height;
	newFrame->channels = oldFrame->channels;
	newFrame->channel_layout = oldFrame->channel_layout;
	newFrame->nb_samples = oldFrame->nb_samples;
	response = av_frame_get_buffer(newFrame, 32);
	if (response != 0)
	{
		return ERROR;
	}
	response = av_frame_copy(newFrame, oldFrame);
	if (response >= 0)
	{
		return ERROR;
	}
	response = av_frame_copy_props(newFrame, oldFrame);
	if (response == NULL)
	{
		return ERROR;
	}
	return 0;
}

I don't have much experience using github, let me know if this is not the correct use for the issues page

Start with the warning output and the copyFrame function shown in the issue, then compare that behavior with 3_transcoding.c. Reproduce the reported transcoding case and determine whether the warning is still present; done means the cause and an appropriate project change are clearly established.