Example 10: change aspect ratio

FFmpegBuilder builder = new FFmpegBuilder().setInput(pathFileInput)     // Filename, or a FFmpegProbeResult
        //.setInput(pathFileLogo)
        .addInput(pathFileLogo).overrideOutputFiles(true) // Override the output if it exists
        .setComplexFilter("overlay=" + position_width + ":" + position_height + "")

        .addOutput(pathFileOutput)   // Filename for the destination
        .setFormat("mp4")        // Format is inferred from filename, or can be set
        .setAudioBitRate(bitRateAudio)      // at 32 kbit/s*/
        //.setTargetSize(250_000)  // Aim for a 250KB file

        //.disableSubtitle()       // No subtiles

        /*.setAudioChannels(1)         // Mono audio
        .setAudioCodec("aac")        // using the aac codec
        .setAudioSampleRate(48_000)  // at 48KHz
        //.setAudioBitRate(32768)      // at 32 kbit/s*/
        //.setVideoCodec("libx264")     // Video using x264
        //.setVideoFrameRate(24, 1)     // at 24 frames per second
        //.setVideoResolution(640, 480) // at 640x480 resolution
        .setVideoResolution(height, width) // at 640x480 resolution
        .setVideoBitRate(bitRateVideo).addExtraArgs("-aspect", "16:9")//means to change the aspect ratio and add argument "-aspect 4:3" to ffmpeg command line
        .setStrict(FFmpegBuilder.Strict.EXPERIMENTAL) // Allow FFmpeg to use experimental specs
        .done();