MediaMouth wrote >> eg. >> ffmpeg -r 12 -i toile4-4-%d.png -filter_complex >> "palettegen[PG],[0:v][PG]paletteuse" toile4.gif >> > > > Following up on the documentation links provided, I wasn't able to work > out what the details of your "-filter_complex" entries were about
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] > I ran it against a test png seq it did work -- I got a gif that preserved > the PNG transparency -- but I got some artifacts. > > Attaching both the PNG seq and the resulting GIF in PngSeq.zip (below) > (hopefully it posts) > The command I used was based on your example: >> ffmpeg -i PngSeq/Frame_%05d.png -framerate 12 -filter_complex >> "palettegen[PG],[0:v][PG]paletteuse" PngSeq.gif > > Questions: > - What caused / how to avoid the artifacts? > - What is PG in your example? 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 "PG" is explained above -- Sent from: http://www.ffmpeg-archive.org/ _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
