FFV1 encoding cheatsheet

FFV1 version 1

The following list contains encoding parameters for FFV1 (version 1):

Name	FFmpeg argument	Valid values	Comments
Coder	-coder	0, 1	0=Golomb Rice, 1=Range Coder
Context	-context	0, 1	0=small, 1=large
GOP size	-g	integer >= 1	For archival use, GOP-size should be "1".

Examples

1. Copy audio "as-is" and use FFV1.1 as video codec.

Parameters are GOP-size=1, coder=1, context=1:

ffmpeg -i <input_video> -acodec copy -vcodec ffv1 -level 1 -coder 1 -context 1 -g 1 <output_video>

FFV1 version 3

The following list contains encoding parameters for FFV1 (version 3).

Name	FFmpeg argument	Valid values	Comments
Coder	-coder	0, 1	0=Golomb-Rice, 1=Range Coder
Context	-context	0, 1	0=small, 1=large
GOP size	-g	integer >= 1	For archival use, GOP-size should be "1".
Version	-level	1, 3	Select which FFV1 version to use.
Threads	-threads	integer >= 1	The number of threads to use while processing. Adjust this to match how many of your available CPU cores you want to use.
Slices	-slices	4, 6, 9, 12, 16, 24, 30	Each frame is split into this number of slices. This affects multithreading performance, as well as filesize: Increasing the number of slices might speed up performance, but also increases the filesize.
Error correction/detection	-slicecrc	0, 1	0=off, 1=on. Enabling this option adds CRC information to each slice. This makes it possible for a decoder to detect errors in the bitstream, rather than blindly decoding a broken slice.
Multi-pass encoding	-pass	1, 2	1=1st pass, 2=2nd pass. FFV1.3 is able to be encoded in multiple passes, to increase compression efficiency. It requires encoding the file twice, though: The 1st pass is to analyze the video source data and logging the results, and the 2nd pass uses this previously gathered information to achieve a higher compression ratio. More information about multi-pass encoding can be read up in the ​Wikipedia article about "Variable bitrate" (VBR).
Multi-pass logfile	-passlogfile	a filename prefix	This is the prefix of the logfile used for storing the information gathered during previous passes in multi-pass encoding mode. Additional info about passlogfile can be found in ​FFmpeg's documentation about video options.

Examples

• Copy audio "as-is" and use FFV1.3 as video codec.

Parameters are GOP-size=1, coder=1, context=1, 24 slices and slice-CRC on:

ffmpeg -i <input_video> -threads 8 -acodec copy -vcodec ffv1 -level 3 -coder 1 -context 1 -g 1 -slices 24 -slicecrc 1 <output_video>

• Encode using 2-pass mode:

1st pass:

ffmpeg -i <input_video> -threads 8 -an -vcodec ffv1 -coder 1 -context 1 -g 1 -level 3 -slices 24 -slicecrc 1 -pass 1 -passlogfile my_passlog <output_video-pass1>

NOTE: You can delete the "<output_video-pass1>" after the first pass.

2nd pass:

ffmpeg -i <input_video> -threads 8 -acodec copy -vcodec ffv1 -coder 1 -context 1 -g 1 -level 3 -slices 24 -slicecrc 1 -pass 2 -passlogfile my_passlog <output_video>