> On Dec 20, 2020, at 11:37 AM, pdr0 <[email protected]> wrote: > > https://ffmpeg.org/ffmpeg.html#Complex-filtergraphs > > filter_complex "connects" multiple inputs and/or outputs. The names in > brackets are named input or output "pads". They are similar to variable > names . eg. [PG] could have been called [label1]. [0:v] means 1st file > (numbering starts with zero), video stream. Similary [0:a] would mean first > file, audio stream . There are reserved syntax for video and audio streams. > This should be in the documetantion on stream numbering > > The first input node is omitted because there is only one input into the > filter graph. The output node is also omitted, because there is only 1 > choice of output. This really means [out] > > -filter_complex "[0:v]palettegen[PG],[0:v][PG]paletteuse[out]" -map [out]
Thanks for taking the time. Clear and helpful. Much appreciated. > I don't see the attachment, but 2 common artifacts for gif in general are > quantization artifacts (gif only has 256 colors max), and the alpha channel > can look very poor and binarized. Or dithering artifacts. There are > different algorithms for dithering In this case the "artifact" I was referring to was a piece of the opaque image itself that remains on all frames of the GIF even though it does not appear in the source PNGs I posted the ZIP file of the source PNGs and resulting GIF here <https://drive.google.com/file/d/1Eu1Qy8LWHrcanwtn84Klwh-k4IZtM4Na/view?usp=sharing> if that helps. Here's the reference CLI again, used to convert the PNGS to GIF: > ffmpeg -i PngSeq/Frame_%05d.png -framerate 12 -filter_complex > "palettegen[PG],[0:v][PG]paletteuse" PngSeq.gif _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
