ffmpegwasm
Pass in base64 encoded images as input (invalid PNG signature error)
Describe the bug I'm receiving an error when passing in a base64 encoded image as the input, here are what I think are the relevant parts of the logs:
Invalid PNG signature
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #1, image2, from 'image.png':
Error while decoding stream #1:0: Invalid data found when processing input
Cannot determine format of input stream 1:0 after EOF
Error marking filters as finished
Conversion failed!
My code is this:
fetches the video file:
ffmpeg.FS('writeFile', name, await fetchFile(files[0]))
this is the base64 data uri:
await ffmpeg.FS('writeFile', 'image.png', payload.elements[0].img)
my complex filter is a variable string, but I've eliminated this as being related to the cause of the issue:
await ffmpeg.run('-i', name, '-i', 'image.png', '-filter_complex', ${complexFilter}, '-map', '[out_v]' , '-pix_fmt', 'yuv420p', 'output.mp4')
I've tried passing it in as a base64 data uri, as just the raw base64 data, as a blob, I can't seem to work out the correct syntax. I've looked through the example scripts, but they retrieve from a local directory rather than encoded images. I'd appreciate it if anyone could help me out with the syntax here.
If it's helpful, here's a link to the base64 string that's inside of payload.elements[0].img: https://pastebin.com/EZNewbWX
This site can be used to decode it and show an image, which verifies the base64 data is valid.
