[FFmpeg-devel] evaluating the experimental status of ffv1 version 3

Michael Niedermayer michaelni at gmx.at
Thu Sep 6 18:01:40 CEST 2012

On Thu, Sep 06, 2012 at 09:35:44AM +0200, Peter B. wrote:
> Quoting David Rice <daverice at mac.com>:
> >	How close are we to an official ffv1 version 3?
> I'm sorry for the massive delay from my side for such an incredible
> long time. The test results are excellent so far, and I couldn't
> spot any errors, but I did all the tests in my free time, due to
> lots of other deadlined-TODOs at work :(
> From my point of view, FFv1.3 worked flawless in all my tests. The
> only open issues so far on my side are:

> 1) Run the whole test-suite under clean conditions with different
> input material (VHS, DigiBeta, ...). All tests done so far were
> fine, but I've done them with 1 single source video, and while
> developing my testscript. So I wouldn't guarantee for what I saw.

also see http://media.xiph.org/video/derf/ for more test material

> 2) The strange fact that newer versions of ffmpeg produce larger
> FFv1 AVIs - even with FFv1.1

did you report this previously? did we come up with some conclusion?
if not which revission is small and which large ?

> @Michael:
> What's your opinion? Are there any parts in the code/bitstream which
> you think should be examined more closely by testing?

the effects of gop size (especially gop=1) and slice count on the
compression rate (especially with 2pass mode)

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Freedom in capitalist society always remains about the same as it was in
ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin
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