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ComfyUI-VideoHelperSuite

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Nodes related to video workflows

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# ComfyUI-VideoHelperSuite
Nodes related to video workflows

## I/O Nodes
### Load Video
Converts a video file into a series of images
- video: The video file to be loaded
- force_rate: Discards or duplicates frames as needed to hit a target frame rate. Disabled by setting to 0. This can be used to quickly match a suggested frame rate like the 8 fps of AnimateDiff.
- force_size: Allows for quick resizing to a number of suggested sizes. Several options allow you to set only width or height and determine the other from aspect ratio.
- frame_load_cap: The maximum number of frames which will be returned. This could also be thought of as the maximum batch size.
- skip_first_frames: How many frames to skip from the start of the video after adjusting for a forced frame rate. By incrementing this number by the frame_load_cap, you can easily process a longer input video in parts. 
- select_every_nth: Allows for skipping a number of frames without considering the base frame rate or risking frame duplication. Often useful when working with animated gifs
A path variant of the Load Video node exists that allows loading videos from external paths
![step](https://github.com/Kosinkadink/ComfyUI-VideoHelperSuite/assets/4284322/b5fc993c-5c9b-4608-afa4-48ae2e1380ef)
![resize](https://github.com/Kosinkadink/ComfyUI-VideoHelperSuite/assets/4284322/98d2e78e-1c44-443c-a8fe-0dab0b5947f3)
If [Advanced Previews](#advanced-previews) is enabled in the options menu of the web ui, the preview will reflect the current settings on the node.
### Load Image Sequence
Loads all image files from a subfolder. Options are similar to Load Video.
- image_load_cap: The maximum number of images which will be returned. This could also be thought of as the maximum batch size.
- skip_first_images: How many images to skip. By incrementing this number by image_load_cap, you can easily divide a long sequence of images into multiple batches.
- select_every_nth: Allows for skipping a number of images between every returned frame.

A path variant of Load Image sequence also exists.
### Video Combine
Combines a series of images into an output video  
If the optional audio input is provided, it will also be combined into the output video
- frame_rate: How many of the input frames are displayed per second.  A higher frame rate means that the output video plays faster and has less duration. This should usually be kept to 8 for AnimateDiff, or matched to the force_rate of a Load Video node.
- loop_count: How many additional times the video should repeat
- filename_prefix: The base file name used for output.
  - You can save output to a subfolder: `subfolder/video`
  - Like the builtin Save Image node, you can add timestamps. `%date:yyyy-MM-ddThh:mm:ss%` might become 2023-10-31T6:45:25
- format: The file format to use. Advanced information on configuring or adding additional video formats can be found in the [Video Formats](#video-formats) section.
- pingpong: Causes the input to be played back in the reverse to create a clean loop.
- save_output: Whether the image should be put into the output directory or the temp directory.
Returns: a `VHS_FILENAMES` which consists of a boolean indicating if save_output is enabled and a list of the full filepaths of all generated outputs in the order created. Accordingly `output[1][-1]` will be the most complete output.
 
Depending on the format chosen, additional options may become available, including
- crf: Describes the quality of the output video. A lower number gives a higher quality video and a larger file size, while a higher number gives a lower quality video with a smaller size. Scaling varies by codec, but visually lossless output generally occurs around 20.
- save_metadata: Includes a copy of the workflow in the output video which can be loaded by dragging and dropping the video, just like with images.
- pix_fmt: Changes how the pixel data is stored. `yuv420p10le` has higher color quality, but won't work on all devices
### Load Audio
Provides a way to load standalone audio files.
- seek_seconds: An optional start time for the audio file in seconds.

## Latent/Image Nodes
A number of utility nodes exist for managing latents. For each, there is an equivalent node which works on images.
### Split Batch
Divides the latents into two sets. The first `split_index` latents go to output A and the remainder to output B. If less then `split_index` latents are provided as input, all are passed to output A and output B is empty.
### Merge Batch
Combines two groups of latents into a single output. The order of the output is the latents in A followed by the latents in B.  
If the input groups are not the same size, the node provides options for rescaling the latents before merging.
### Select Every Nth
The first of every `select_every_nth` input is passed and the remainder are discarded
### Get Count
### Duplicate Batch

## Video Previews
Load Video (Upload), Load Video (Path), Load Images (Upload), Load Images (Path) and Video Combine provide animated previews.  
Nodes with previews provide additional functionality when right clicked
- Open preview
- Save preview
- Pause preview: Can improve performance with very large videos
- Hide preview: Can improve performance, save space
- Sync preview: Restarts all previews for side-by-side comparisons

### Advanced Previews
Advanced Previews must be manually enabled by clicking the settings gear next to Queue Prompt and checking the box for VHS Advanced Previews.  
If enabled, videos which are displayed in the ui will be converted with ffmpeg on request. This has several benefits
- Previews for Load Video nodes will reflect the settings on the node such as skip_first_frames and frame_load_cap
  - This makes it easy to select an exact portion of an input video and sync it with outputs
- It can use substantially less bandwidth if running the server remotely
- It can greatly improve the browser performance by downsizing videos to the in ui resolution, particularly useful with animated gifs
- It allows for previews of videos that would not normally be playable in browser.
- Can be limited to subdirectories of ComyUI if `VHS_STRICT_PATHS` is set as an environment variable.

This fucntionality is disabled since it comes with several downsides
- There is a delay before videos show in the browser. This delay can become quite large if the input video is long
- The preview videos are lower quality (The original can always be viewed with Right Click -> Open preview)

## Video Formats
Those familiar with ffmpeg are able to add json files to the video_formats folders to add new output types to Video Combine. 
Consider the following example for av1-webm
```json
{
    "main_pass":
    [
        "-n", "-c:v", "libsvtav1",
        "-pix_fmt", "yuv420p10le",
        "-crf", ["crf","INT", {"default": 23, "min": 0, "max": 100, "step": 1}]
    ],
    "audio_pass": ["-c:a", "libopus"],
     "extension": "webm",
     "environment": {"SVT_LOG": "1"}
}
```
Most configuration takes place in `main_pass`, which is a list of arguments that are passed to ffmpeg. 
- `"-n"` designates that the command should fail if a file of the same name already exists. This should never happen, but if some bug were to occur, it would ensure other files aren't overwritten.
- `"-c:v", "libsvtav1"` designates that the video should be encoded with an av1 codec using the new SVT-AV1 encoder. SVT-AV1 is much faster than libaom-av1, but may not exist in older versions of ffmpeg. Alternatively, av1_nvenc could be used for gpu encoding with newer nvidia cards. 
- `"-pix_fmt", "yuv420p10le"` designates the standard pixel format with 10-bit color. It's important that some pixel format be specified to ensure a nonconfigurable input pix_fmt isn't used.

`audio pass` contains a list of arguments which are passed to ffmpeg when audio is passed into Video Combine

`extension` designates both the file extension and the container format that is used. If some of the above options are omitted from `main_pass` it can affect what default options are chosen.  
`environment` can optionally be provided to set environment variables during execution. For av1 it's used to reduce the verbosity of logging so that only major errors are displayed.  
`input_color_depth` effects the format in which pixels are passed to the ffmpeg subprocess. Current valid options are `8bit` and `16bit`. The later will produce higher quality output, but is experimental.

Fields can be exposed in the webui as a widget using a format similar to what is used in the creation of custom nodes. In the above example, the argument for `-crf` will be exposed as a format widget in the webui. Format widgets are a list of up to 3 terms
- The name of the widget that will be displayed in the web ui
- Either a primitive such as "INT" or "BOOLEAN", or a list of string options
- A dictionary of options

ComfyUI-VideoHelperSuite

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