[Bug 645157] change gst-ffmpeg's baseclass defaults to better yet sane values
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Thu Mar 31 05:04:36 PDT 2011
https://bugzilla.gnome.org/show_bug.cgi?id=645157
GStreamer | gst-ffmpeg | git
Robert Swain <robert.swain> changed:
What |Removed |Added
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CC| |robert.swain at gmail.com
--- Comment #1 from Robert Swain <robert.swain at gmail.com> 2011-03-31 12:04:33 UTC ---
To be blunt - FFmpeg defaults suck. Perhaps those in gst-ffmpeg don't suck
quite so much but considering your concerns about quality, it seems likely.
We can't just change the gst-ffmpeg property defaults though as some values are
good for some codecs and other values are good for other codecs.
There are rumbles amongst libav/FFmpeg ranks that we want to move a lot of
options out of AVCodecContext and into AVOption arrays per-codec.
Until that happens, I would recommend adjusting the defaults that benefit all
codecs and then writing per-codec presets for the remaining options required to
achieve good quality.
For MPEG-2, the command line options, '-cmp 2 -subcmp 2 -mbd 2 -trellis 1',
would be a good start. Those can be translated to gst-ffmpeg properties pretty
easily.
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