ComfyUI Node: LNL Frame Selector

LNL Frame Selector:

The LNL_FrameSelectorV3 node is designed to facilitate the extraction and processing of frames from video files, making it an essential tool for AI artists working with video content. This node allows you to select specific frames from a video based on various criteria, such as skipping the initial frames, selecting every nth frame, and limiting the total number of frames processed. By providing a flexible and user-friendly interface, the LNL_FrameSelectorV3 node helps streamline the workflow of extracting meaningful frames for further artistic manipulation or analysis. Its primary goal is to offer a robust and efficient method for frame selection, ensuring that you can focus on the creative aspects of your work without getting bogged down by technical details.

LNL Frame Selector Input Parameters:

video_path

This parameter specifies the path to the video file from which frames will be extracted. The node supports various video formats, including webm, mp4, and mkv. You can select the desired video file from a list of available files in the input directory. This parameter is crucial as it determines the source of the frames to be processed.

force_size

This parameter allows you to enforce a specific size for the extracted frames. You can choose from options like Disabled, Custom Height, Custom Width, Custom, 256x?, ?x256, 256x256, 512x?, ?x512, and 512x512. This setting helps ensure that the frames meet your size requirements, which can be particularly useful for maintaining consistency across different frames or preparing them for further processing.

custom_width

When force_size is set to an option that involves custom width, this parameter allows you to specify the desired width of the frames. The value can range from 0 to 8192, with a default of 512 and a step of 8. This parameter provides fine-grained control over the width of the extracted frames, enabling you to tailor them to your specific needs.

custom_height

Similar to custom_width, this parameter is used when force_size involves custom height. It allows you to set the desired height of the frames, with values ranging from 0 to 8192, a default of 512, and a step of 8. This parameter ensures that the frames are resized to the appropriate height, which can be essential for certain artistic or technical requirements.

LNL Frame Selector Output Parameters:

Current image

This output provides the current frame being processed as an image. It is useful for real-time previewing or further manipulation of individual frames.

Image Batch (in/out)

This output contains a batch of images, representing the frames that have been processed. It can be used for batch processing or analysis of multiple frames at once.

Frame in

This output indicates the index of the frame being processed at the input stage. It helps track the progress of frame extraction and processing.

Frame out

This output indicates the index of the frame being processed at the output stage. It is useful for understanding the sequence of frames being handled by the node.

Filename

This output provides the name of the video file from which the frames are being extracted. It helps keep track of the source file, especially when working with multiple videos.

Frame count (rel)

This output gives the relative count of frames processed, excluding any skipped frames. It is useful for understanding the effective number of frames being handled.

Frame count (abs)

This output provides the absolute count of frames processed, including any skipped frames. It helps track the total number of frames considered during processing.

Current frame (rel)

This output indicates the relative index of the current frame being processed, excluding skipped frames. It is useful for tracking the position within the selected frames.

Current frame (abs)

This output indicates the absolute index of the current frame being processed, including skipped frames. It helps understand the position within the entire video.

Frame rate

This output provides the frame rate of the video, which can be important for synchronizing frame extraction with the video's playback speed.

audio

This output contains the audio track of the video, if available. It can be useful for applications that require both visual and auditory information.

LNL Frame Selector Usage Tips:

• To optimize performance, use the force_size parameter to resize frames to a manageable size, especially when working with high-resolution videos.
• Utilize the skip_first_frames and select_every_nth parameters to focus on specific parts of the video, reducing processing time and extracting only the most relevant frames.
• Ensure that the video file is in a supported format (webm, mp4, mkv) to avoid compatibility issues.

LNL Frame Selector Common Errors and Solutions:

Unsupported video format

• Explanation: The selected video file is not in a supported format.
• Solution: Convert the video to a supported format such as webm, mp4, or mkv.

Frame extraction limit reached

• Explanation: The number of frames to process has exceeded the specified limit.
• Solution: Increase the frame_load_cap or adjust the select_every_nth parameter to process fewer frames.

Invalid custom width or height

• Explanation: The specified custom width or height is outside the allowed range.
• Solution: Ensure that the custom_width and custom_height values are within the range of 0 to 8192 and adjust them accordingly.