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Combine a transparent PNG and audio into a transparent WebM video
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If you feel like this example could be improved, you may edit this example here.

ffmpeg -loop 1 -i image.png -i audio.mp3 -c:a libvorbis -b:a 128k -c:v libvpx-vp9 -tune psnr -g 7500 -keyint_min 7500 -crf 40 -pix_fmt yuva420p -threads 4 -speed 5 -deadline realtime -shortest -movflags +frag_keyframe+empty_moov -f webm output.webm

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