[FFmpeg-user] formula for transcoding to ogv, shrinking an mkv
gajs-f0el at dea.spamcon.org
Fri Jan 18 17:17:40 CET 2013
On Fri, 18 Jan 2013, Tom Evans wrote:
> You've been fooled, this is not ffmpeg, it is a fork of ffmpeg, and
> you're unlikely to get support for it on here. The fault is your
> distributor, who decided to switch to the fork. It is very easy to
> build the latest ffmpeg from source, which is what is supported on
> this mailing list.
Thank you for your reply, Tom. I have only recently become aware that
Ubuntu is using a fork: I found that information when, on getting certain
error messages that direct me to use avconv, I attempted to find out what
this avconv is. I really don't like the direction in which the Ubuntu
project is moving these days--for reasons other than their use of the fork
in preference to ffmpeg--so next time I upgrade my system, I'm likely to
go with some other distro. Meantime, I'll look into compiling ffmpeg: I
suppose it's available through git?
> If you aren't trying to maximise the available space, eg by ensuring
> that you use every single byte available on a DVD, a target bitrate is
> not really worth it, and hence by extension, 2 pass is not worth it.
As stated in my initial posting, I need to upload my screencasts to a site
that has fairly low upload limits. So my files need to be around 100 MB,
give or take. This is the reason why I am trying to transcode and shrink
the lossless screencast files I record. The upload site seems to deal best
with .ogv files.
> Experiment with the crf option until you find a quality level you are
> happy with. A higher crf will result in a lower quality, lower bitrate
> file, a lower crf will increase the quality and bitrate.
Now I'm getting confused: someone else seemed to be saying (if I
understood him correctly) that I should not be using the -crf option when
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