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[–] 0t79JeIfK01RHyzo@lemmy.ml 1 point 8 months ago (2 children)

The version I have was copied from stackoverflow. It doesn't work very well, it makes a rough estimate to get the video file size under the set value. As an example

resize video.mp4 10

Which then resizes the video to 10 megabytes if possible.

resize.sh code

file=$1
target_size_mb=$2  # target size in MB
target_size=$(( $target_size_mb * 1000 * 1000 * 8 )) # target size in bits
length=`ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$file"`
length_round_up=$(( ${length%.*} + 1 ))
total_bitrate=$(( $target_size / $length_round_up ))
audio_bitrate=$(( 128 * 1000 )) # 128k bit rate
video_bitrate=$(( $total_bitrate - $audio_bitrate ))
ffmpeg -i "$file" -b:v $video_bitrate -maxrate:v $video_bitrate -bufsize:v $(( $target_size / 20 )) -b:a $audio_bitrate "${file}-${target_size_mb}mb.mp4"

I'll probably replace it eventually.

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[–] db2@lemmy.world 2 points 8 months ago* (1 child)

Definitely not the same lol

Mine uses ffmpeg to change the resolution, it doesn't so much care about file sizes.

It could be a one-liner if you only ever feed it a single file to manipulate..

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[–] 0t79JeIfK01RHyzo@lemmy.ml 2 points 8 months ago

I might add one for scaling. I just don't use it as frequently as trying to meet a file size limit. The scaling is also much easier to remember

ffmpeg -i  in.mp4 -vf "scale=600:-1" -an out.mp4

It does get complicated though, when scaling many videos and images, I've used something like the following in the past

find .  -exec ffmpeg -i {} -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1:color=black" {}.mp4 \;

Those were the only two that showed up when I typed history | grep scale.

after commenting, I also added a new video file resizer.

It works significantly better than the one I previously posted. It's also copied from stackoverflow.

bitrate="$(awk "BEGIN {print int($2 * 1024 * 1024 * 8 / $(ffprobe \
    -v error \
    -show_entries format=duration \
    -of default=noprint_wrappers=1:nokey=1 \
    "$1" \
) / 1000)}")k"
ffmpeg \
    -y \
    -i "$1" \
    -c:v libx264 \
    -preset medium \
    -b:v $bitrate \
    -pass 1 \
    -an \
    -f mp4 \
    /dev/null \
&& \
ffmpeg \
    -i "$1" \
    -c:v libx264 \
    -preset medium \
    -b:v $bitrate \
    -pass 2 \
    -an \
    "${1%.*}-$2mB.mp4"