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Your issue lies in the application of scaling and fps filtering. Both `SCALING` and `FPS_FILTER` are being set conditionally, and if both are needed, one will override the other since both are using `-vf`. Combine them in one `-vf` argument to avoid conflict:

```
if [ $WIDTH -lt $HEIGHT ]; then
    SHORTER_SIDE=$WIDTH
    if [ $WIDTH -gt $MAX_RESOLUTION ]; then
        SCALING="scale=$MAX_RESOLUTION:-2"
    fi
else
    SHORTER_SIDE=$HEIGHT
    if [ $HEIGHT -gt $MAX_RESOLUTION ]; then
        SCALING="scale=-2:$MAX_RESOLUTION"
    fi
fi

if [ $FPS -gt $MAX_FPS ]; then
    if [ -z "$SCALING" ]; then
        SCALING="fps=$MAX_FPS"
    else
        SCALING="$SCALING, fps=$MAX_FPS"
    fi
fi
```

Then apply the combined filter:

```
ffmpeg_cmd=(
    "-i" "$FILE"
    "-vf" "$SCALING"
    "-c:v" "libx265"
    "-preset" "slow"
    "-crf" "$CRF_VALUE"
    "-c:a" "aac"
    "-b:a" "$AUDIO_BITRATE"
    "-movflags" "+faststart"
    "$OUTPUT_FILE"
)
```

This ensures both scaling and frame rate adjustments are applied correctly.