filter CSS: Cascading Style Sheets MDN

Set format of alpha of the overlaid video, it can be straight orpremultiplied. The first input is the “main”video on which the second input is overlaid. Nb_iterations specifies the number of times the transform isapplied to the image, and defaults to 1. The parameters to pass to the libopencv filter. If not specified, the defaultvalues are assumed. This filter supports same commands as options, excluding weights option.

• Perform HDR(High Dynamic Range) to SDR(Standard Dynamic Range) conversion with tone-mapping.
• Determines blockiness of frames without altering the input frames.
• Range is [0, 255] and default value is 255, i.e. all eight pixels are used.
• This filter supports almost all of the above options as commands.
• Allowed range is from 0.01 to 9000.

Default is cut off near1550 Hz. With range set to 1 cut off frequency is set to 2100 Hz. The best result can be reached when you take one track as base andsynchronize other tracks one by one with it.

24 chromahold

Attacks refers toincrease of volume and decays refers to decrease of volume. A typical value for attack is 0.3 seconds anda typical value for decay is 0.8 seconds. If specified number of attacks & decays is lower than number of channels, the lastset attack/decay will be used for all remaining channels.

Video Sources

The length of a frame is specified in milliseconds. By default, theDynamic Audio Normalizer uses a frame length of 500 milliseconds, which hasbeen found to give good results with most files. Note that the exact frame length, in number of samples, will be determinedautomatically, based on the sampling rate of the individual input audio file.

Capture and transfer with the same field order. This mode only existsfor the documentation of the other options to refer to, but if youactually select it, the filter will faithfully do nothing. Only evaluate expressions once during the filter initialization or whena command is processed. Specify the offsets to place the input image at within the padded area,with respect to the top/left border of the output image.