| Message ID | 20200825042007.18535-5-gautamramk@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [FFmpeg-devel,RFC,v4,1/5] libavcodec/jpeg2000: Make tag tree functions non static | expand |
| Context | Check | Description |
|---|---|---|
| andriy/default | pending | |
| andriy/make | success | Make finished |
| andriy/make_fate | success | Make fate finished |
On Tue, Aug 25, 2020 at 09:50:07AM +0530, gautamramk@gmail.com wrote: > From: Gautam Ramakrishnan <gautamramk@gmail.com> > > This patch adds documentation for the utility and usage > of "layer_rates" option used in the JPEG2000 encoder. > --- > doc/encoders.texi | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) this should be in the patch which adds the feature described that way its all selfcontained thx [...]
On Tue, Aug 25, 2020 at 2:07 PM Michael Niedermayer <michael@niedermayer.cc> wrote: > > On Tue, Aug 25, 2020 at 09:50:07AM +0530, gautamramk@gmail.com wrote: > > From: Gautam Ramakrishnan <gautamramk@gmail.com> > > > > This patch adds documentation for the utility and usage > > of "layer_rates" option used in the JPEG2000 encoder. > > --- > > doc/encoders.texi | 16 ++++++++++++++++ > > 1 file changed, 16 insertions(+) > > this should be in the patch which adds the feature described > that way its all selfcontained I'll squash this with the previous patch and resubmit. > > thx > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > I do not agree with what you have to say, but I'll defend to the death your > right to say it. -- Voltaire > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
diff --git a/doc/encoders.texi b/doc/encoders.texi index fd9235a05a..481ad2fb3d 100644 --- a/doc/encoders.texi +++ b/doc/encoders.texi @@ -1401,6 +1401,22 @@ Possible values are: @end table Set to @code{lrcp} by default. +@item layer_rates @var{string} +By default, compression is done using the quality metric. This option allows for +compression using compression ratio. The compression ratio for each level could +be specified. The compression ratio of a layer @code{l} species the what ratio of +total file size is contained in the first @code{l} layers. + +Example usage: + +@example +ffmpeg -i input.bmp -c:v jpeg2000 -layer_rates "100,10,1" output.j2k +@end example + +This would compress the image to contain 3 layers, where the data contained in the +first layer would be compressed by 1000 times, compressed by 100 in the first two layers, +and shall contain all data while using all 3 layers. + @end table @section librav1e
From: Gautam Ramakrishnan <gautamramk@gmail.com> This patch adds documentation for the utility and usage of "layer_rates" option used in the JPEG2000 encoder. --- doc/encoders.texi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)