[Bf-committers] FFMPEG properties from Blender presets overridden by defaults?

Randall Rickert randall at rickert-digital.com
Sat Nov 20 18:26:48 CET 2010

My goal is to encode H264 Quicktime files that are compatible with
Apple's Quicktime Player (should not be too much to ask, right?). Before
2.5, I could do this by tweaking the individual ffmpeg options that were
exposed in the UI after selecting the H264 preset. That preset was
clearly designed for making H264 AVI files, but it would work for
Quicktime after changing the container format and tweaking ffmpeg
options, especially getting rid of "flags:loop".

2.5 doesn't expose those options in the UI. They seem to be hardcoded in
source/blender/blenkernel/intern/writeffmpeg.c under case
FFMPEG_PRESET_H264. They mirror the options in libx264-default.preset
that is distributed with ffmpeg. So I'm editing the settings in
writeffmpeg.c to see if I can get Blender to write a QT
Player-compatible Quicktime movie. No matter what I do to those
settings, Blender's stderr stream shows that it is still using the
defaults, not the settings I modified.

The settings seem to be stored in a RenderData->ffcodecdata.properties,
but I get lost (I'm not a programmer) as I try to figure out where they
come from, since they obviously don't come from the FFMPEG_PRESET_H264
settings I edited. Any help?


p.s.: Please don't suggest rendering an image sequence, then encoding
from the command line! That's what I do for 3D renders, but I want to
encode output from the VSE. It seems stupid to render an image sequence
from the VSE, because it would just duplicate the same frames I already
have on disk but with different frame numbers, wasting a lot of disk

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