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Last active July 31, 2025 16:02
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    # Upscale 1080p to 4k using ffmpeg

    Just use the command below:

    ```
    ffmpeg -i INPUT_FILE \
    -vf scale=3840x2160:flags=lanczos \
    -c:v libx264 \
    -crf 13 \
    -c:a aac -b:a 512k \
    -preset slow \
    OUTPUT_FILE
    ```

    Where:
    - `INPUT_FILE` is the path to your input file
    - `-vf scale=3840x2160:flags=lanczos`is the new resolution using lanczos
    - `-c:v libx264` is the codec H264
    - `-crf 13` is the desired quality - From 0 to 51, the higher the number the worse. The smaller the number, the larger the file size
    - `-c:a aac -b:a 512k` is the audio codec and bitrate
    - `-preset slow` is the preset used. To go faster, use `ultrafast`
    - `OUTPUT_FILE` is the output file

    Hope it helps.