Options Being Appended Before Instead of After Input File

[mzagaja]

I am attempting to add cover art to podcast encodes. The relevant encoder segment is as follows:

  /**
   * Generates the audio encode command:
   *   ffmpeg -y -i /path/to/input/clean.mov -c:a "libmp3lame" -ac "2" -b:a "160k"
   *     -ar "44100" -joint_options: "0" -f "mp3" -map "a:0" /path/to/output.mp3
   * @returns {FFmpegCommand} - the object representing the screener ffmpeg command
   */
  generateEncodingCommand () {
    const opts = {
      encoderType: this.options.encoderType,
      mediaType: 'audio',
      profile: this.options.profile,
      probe: this.probe,
      passes: this.passes,
      jobOptions: this.options.jobOptions
    };
    this.profileSettings = EncoderSettings.create(opts);
    const commandSettings = this.profileSettings.getProfileSettings();

    const input = new FFmpegInput(this.options.inputPath);
    const output = new FFmpegOutput(
      this.options.outputPath,
      commandSettings.outputOptions
    );
    // See http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=9af71b326fda1c6f32a26d465f7740110113e759
    // For adding cover art to an audio file.
    const coverArtInput = new FFmpegInput("/encoding_service/assets/images/ted-talks-album-art.png", {
      'disposition:v:1': 'attached_pic'
    })

    const cmd = new FFmpegCommand(commandSettings.globalOptions);
    cmd.addInput(input);
    cmd.addInput(coverArtInput);
    cmd.addOutput(output);

    return cmd;
  }
}

When I run this, the ouptut command I get is:

"ffmpeg -y -i \"/tmp/aac_podcast_audio_96k-0b8f7a55f69260412d09fd36/2023T_changhua_wu_-_S01_-Mix.wav\" -disposition:v:1 \"attached_pic\" -i /encoding_service/assets/images/ted-talks-album-art.png -c:a \"libfdk_aac\" -b:a \"96k\" -ar \"44100\" -ac \"1\" -vn -f \"mp4\" -movflags \"+faststart\" -metadata \"album=TEDTalks\" /tmp/aac_podcast_audio_96k-0b8f7a55f69260412d09fd36/2023t-changhua-wu-003-c91642d3-b0b8-4bf9-9825-2fd096f09fba-96k.m4a"

I would expect:

"ffmpeg -y -i \"/tmp/aac_podcast_audio_96k-0b8f7a55f69260412d09fd36/2023T_changhua_wu_-_S01_-Mix.wav\" -i /encoding_service/assets/images/ted-talks-album-art.png -disposition:v:1 \"attached_pic\" -c:a \"libfdk_aac\" -b:a \"96k\" -ar \"44100\" -ac \"1\" -vn -f \"mp4\" -movflags \"+faststart\" -metadata \"album=TEDTalks\" /tmp/aac_podcast_audio_96k-0b8f7a55f69260412d09fd36/2023t-changhua-wu-003-c91642d3-b0b8-4bf9-9825-2fd096f09fba-96k.m4a"

Is there a reason that the options are being appended to the previous input stream, or am I misunderstanding the significance of this ordering?