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Use ffmpeg to convert raw Android camera frame buffers
# Assuming the raw byte[] buffer from onPreviewFrame was written at $1
# Need preview size since we dumped to a raw file w/out header info
# Converting to JPEG
ffmpeg -f image2 -vcodec rawvideo -s $SIZE -pix_fmt nv21 -i $INPUT out.jpeg
# Converting to PNG
ffmpeg -f image2 -vcodec rawvideo -s $SIZE -pix_fmt nv21 -i $INPUT out.png
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