GenMedia Video Editor Skill

Core Workflows

Cinematic Video Generation (Veo 3.1)

• Five-Part Formula: Combine Cinematography (e.g., "high-angle long shot"), Subject, Action, Context (e.g., "Parisian cafe at dusk"), and Style (e.g., "vintage 16mm film").
• Soundstage Direction: For Veo 3 models, use quotation marks for specific dialogue:

  a robot says "HELLO WORLD"

  . Specify sound effects and ambient noise:

  [loud thunder]

  ,

  [gentle rain background]

  .
• Negative Prompting: Explicitly exclude unwanted elements using the

  negative_prompt

  parameter (e.g., "blurry", "static", "distorted faces").
• Advanced Modalities:
  • Use

    veo_first_last_to_video

    for precise control over transitions between two key frames.
  • Use

    veo_ingredients_to_video

    (or

    veo_reference_to_video

    ) with up to 3 reference images to maintain character and style consistency across multi-shot sequences.
  • Use the

    veo-3.1-lite-generate-001

    model for faster video generation at 720p or 1080p when full fidelity is not strictly required.

Image-on-Video Overlay

1. Determine the source video dimensions using

   ffmpeg_get_media_info

   .
2. Calculate coordinates (x,y) based on these dimensions (e.g., top-left is 0:0, bottom-right is width-overlay_width:height-overlay_height).
3. Call

   ffmpeg_overlay_image_on_video

   .

GIF Generation

• Use the two-pass approach provided by

  ffmpeg_video_to_gif

  .
• Default to

  fps=15

  and

  scale_width_factor=0.33

  unless the user requests higher resolution or smoothness.

Clip Concatenation

• Ensure all clips have matching dimensions and frame rates.
• Use

  ffmpeg_concatenate_media_files

  . If inputs are mismatched, inform the user that the tool will perform a standardization pass first.

Audio-Video Sync

1. Check the audio duration using

   ffmpeg_get_media_info

   .
2. Ensure the video matches this duration.
3. Use

   ffmpeg_combine_audio_and_video

   . Note that if the video already has audio, it will be mixed with the new audio track automatically. You can use the optional

   input_video_volume_db_change

   and

   input_audio_volume_db_change

   parameters to adjust their relative levels.

Technical Tips

• Always check media info before attempting complex filters.
• Prefer

  .mp4

  (H.264) for output compatibility unless otherwise specified.