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I'm using OS X Mavericks (10.9.4) and installed ffmpeg from homebrew.
When executing this command (assuming input file exists):
ffmpeg -i ololo.wmv -vf scale=500:-1 -auto-alt-ref 1 -lag-in-frames 20 -pass 1 ololo.webm
I get this output:
ffmpeg version 2.3 Copyright (c) 2000-2014 the FFmpeg developers
built on Jul 18 2014 22:48:21 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
libavutil 52. 92.100 / 52. 92.100
libavcodec 55. 69.100 / 55. 69.100
libavformat 55. 48.100 / 55. 48.100
libavdevice 55. 13.102 / 55. 13.102
libavfilter 4. 11.100 / 4. 11.100
libavresample 1. 3. 0 / 1. 3. 0
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
Unrecognized option 'auto-alt-ref'.
Error splitting the argument list: Option not found
Why? According to this page on webmproject.org, this option should be there.
Display Name
Posted 2014-07-27T09:14:35.197
Reputation: 933
1For the future try to always specify the encoder you want rather than having ffmpeg auto-select one. Then you would've gotten "unknown encoder libvpx". – slhck – 2014-07-28T06:53:43.783
@slhck of course, now I understand. I just used a template from an online guide for creating
WebMs and (obviously) were knowing almost nothing about ffmpeg. But it turned out, one needs to understand what's going on, otherwise it won't work. :D – Display Name – 2014-07-28T07:08:00.833Ah, I see. It's not your fault, of course. I'd rather say the online guide needs a bit of an update then — do you have a link? You don't necessarily have to understand everything as long as the description is also aimed at people with less experience. – slhck – 2014-07-28T08:01:22.637
@slhck it's in russian language... and not really a complete guide. just some examples for people who can guess everything from them. Maybe I will write another guide at some day. – Display Name – 2014-07-28T08:54:20.823
There's also http://trac.ffmpeg.org/wiki/Encode/VP8 (shameless plug, I wrote it :P)
– slhck – 2014-07-28T09:54:16.603@slhck I used ffmpeg with my script, which does 2-pass encoding trying to fit in a given file size: https://github.com/magicgoose/webm-buddy/blob/master/convert-to-webm.py
– Display Name – 2014-07-28T10:01:47.160