This is the prefix of the logfile used for storing the information gathered during previous passes in multi-pass encoding mode. More information about multi-pass encoding can be read up in the Wikipedia article about 'Variable bitrate' (VBR). 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. FFV1.3 is able to be encoded in multiple passes, to increase compression efficiency. This makes it possible for a decoder to detect errors in the bitstream, rather than blindly decoding a broken slice.ġ=1st pass, 2=2nd pass.

Enabling this option adds CRC information to each slice.

This affects multithreading performance, as well as filesize: Increasing the number of slices might speed up performance, but also increases the filesize.Ġ=off, 1=on. Adjust this to match how many of your available CPU cores you want to use.Įach frame is split into this number of slices. The number of threads to use while processing. The following list contains encoding parameters for FFV1 (version 3).Ġ=Golomb-Rice, 1=Range Coder, 2=Range Coder (with custom state transition table) Parameters are GOP-size=1, coder=1, context=1: The following list contains encoding parameters for FFV1 (version 1):Ġ=Golomb Rice, 1=Range Coder, 2=Range Coder (with custom state transition table)įor archival use, GOP-size should be '1'.Ĭopy audio 'as-is' and use FFV1.1 as video codec. There are two versions of the codec supported by ffmpeg, version 1 and 3. A lossless codec comparison found FFV1 to be the 'most balanced', offering 'relatively good speed and high compression'. Therefore, FFV1 is a good choice for archiving and preservation.

It is lossless, meaning that it compresses video without introducing quantization degradations. FFV1 is a video codec developed within FFmpeg.

Ffmpeg vcodec