FFAStrans wiki

This encoder creates FFmpegs Prores AW/KS compatible files in mov format. Note that this codec is unauthorized reverse engineered from the original ProRes codec by Apple. Compatibility is NOT guaranteed so use at own risk. Excerpt from the ProRes white paper from 2018:

"Using any unauthorized implementation (like the FFmpeg and derivative implementations) may lead to decoding errors, performance degradation, incompatibility, and instability"

Format

Here you set the resolution for the Prores AW/KS format.

Profile

Sets the Prores variant profiles as Proxy, LT, SQ, HQ and XQ. Please note that the only one supporting 4:4:4 10bit is XQ, while the others are limited to 4:2:2 10bit.

Processing

Sets the processing mode for the video. This comes especially in handy when you just want to conform audio and leave video as is.

Full processing will process (scale, re-interlace, color convert) etc. and re-encode the video.

None, transwrapping cause FFAStrans to try and copy the video stream as is. It will check for some key properties that fits with the selected profile. If the stream cannot be copied FFAStrans will throw an error.

Transwrap when possible cause FFAStrans to try transwrapping. If it fail, it will do full processing.

Note: Audio will undergo full processing regardless of this setting.

Resizing

Sets the resizing method for how the source should fit to the output size.

Stretch will stretch the source to fit regardless of aspect.

Fit will fit the entire source within the output size and keep aspect. This might cause letterboxing or curtains.

Fill will make sure the output is filled with source image while keeping aspect.

Video range

Sets the video range of the output.

Same as source implies no change and the encoder will forward the range from the input.

Set to full/limited will just set the video range metadata.

Convert to full/limited will convert the input to set value. If input range is same as output no converion is being performed.

Color space

Enables you to define what color space the output will be.

Same as source implies no change and the encoder will use same color specs as input.

Writing library

This option lets you flag the output to either the inbuilt default "Lavc" or "Standard". "Standard" might fix the odd cases of rejected files due to the default non-standard writing library.

Apply LUT or automatic tone mapping

Enables using a LUT in the conversion. This option also support using a custom by setting using a variable representing the full path to a .cube file. Variables representing any of the available inbuilt LUTs is also supported.

None implies no LUTs are being used in the conversion.

Auto (LUT) will try to analyze the input file and the desired out color space and apply the corresponding LUT for it.

Auto (Tone mapping) will convert using tone mapping algorithm instead of a static LUT.

Interlaced input

With this option you can choose how FFAStrans processes incoming media to the encoder. The "Analyze"option will determine from the actual video, not meta-data.

Framerate

Sets the framerate of the output file.

Field order

Sets the field order of the SD/HDoutput file. Note that HD is never lower field.

Colorspace

Sets the output colorspace and meta-data.

Writing Library

Sets the writing library metadata of the video essence. "Lavc" is the default FFMpeg implementation, while "Standard" might provide better compatibility in some scenarios.

Set start TC

This option field sets the start timecode of the video. By default FFAStrans will use the %s_start_tc% variable from the source video but can be changed to other variables or just static timecodes.

Discrete tracks

Sets the number of audio tracks/streams of the output file. One track can have one ore more channels.

Source channels as tracks

This setting will distribute all source audio channels into discrete mono channels.

Same as source

This settings will make FFAStrans try and create the exact same layout as the original media.

Total channels

Sets the total amount of channels the output file holds. The channels are evenly distributed among the available discrete tracks defined. Regardless of the original layout, all audio channels are mapped to separate audio sources. Based on this, FFAStrans will map these sources to match selected audio configuration.. If the audio source has fewer channels than the output then the rest will be filled with silent audio.

If you select "Custom channel mapping" in the "Total channels" drop-down, FFAStrans will enable setting custom mapping per audio track:

Set custom mapping

This will open a separate window displaying all discrete track selected in the "Discrete tracks" drop-down.

For usage and how to configure press the "?" button in the "Custom audio mapping" window.

Conform volume

Use this to conform volume level to specified level. For this to work you MUST have a variable table from a previous analyze in the "Loudness"-node. You can also use this option to normalize audio by using the peak levels from "Loudness"-node. Maximum level is 0 dB.