[FFmpeg-user] 2-pass ENcoding with mpeg (switching from mencoder)

Tom Evans tevans.uk at googlemail.com
Wed Aug 7 15:55:31 CEST 2013

On Wed, Aug 7, 2013 at 1:56 PM, James Board <jpboard2 at yahoo.com> wrote:
> The only thing in the ffmpeg output from the 2ns pass that looks problematic is:
>     [libx264 @ 0x206f040] constant rate-factor is incompatible with 2pass
>     ....
>     Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

[complete command line and uncut output missing]

CRF is one way of controlling the resulting bitrate, target bit rate
and 2-pass encoding is another. You can't use both at the same time.



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