Ffmpeg to convert gif to webm with reverse functio

问题:

I'm trying to convert a gif file to webm file using the below which works fine however I’m wondering is it also possible to reverse it as well using ffmpeg or would I need to reverse it using imagemagick first then cover it using ffmpeg

ffmpeg -i your_gif.gif -c:v libvpx -crf 12 -b:v 500K output.webm

Any help is appreciated

回答1:

The script posted here might help you. This one seems to be in bash but ripping the commands should work on Windows as well. https://github.com/WhatIsThisImNotGoodWithComputers/ffmpeg-webm-scripts

These are the relevant lines of code (note that they need to edited for your setup):

ffmpeg -i "${INPUT_FILE}" -ss $START_TIME -to $TO_TIME -an -qscale 1 $TEMP_FOLDER/%06d.jpg
cat $(ls -r $TEMP_FOLDER/*jpg) | ffmpeg -f image2pipe -vcodec mjpeg -r 25 -i - -c:v libvpx -crf 20 -b:v $FRAMERATE $CROPSCALE -threads 0 -an $OUTPUT_FILE

You basically have to convert all stills to jpgs and then back into webm, but in reverse order.

回答2:

From ffmpeg --help, you can see what codecs ffmpeg supports with ffmpeg -codecs. ffmpeg -codecs|grep -i gif on mine says it supports gif.

ffmpeg checks extensions to get file type if you don't override,

ffmpeg -i onoz.webm onoz.gif

does the trick just fine.