Fe2_pngex_export_cue_points, Fe2_pngex_enable_alpha, Fe2_pngex_compression_level – Google Flix Engine Linux Reference Manual User Manual
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Flix Engine Linux Module Documentation
5.32.2.5
#define FE2_PNGEX_AUTO_EXPORT_START_TIME
Filter parameter for setting PNG auto generation start time.
The value specified MUST be in milliseconds. This parameter affects the following changes on time
calculations explained in the
section:
time_slice_duration =
(video_stream_duration - FE2_PNGEX_AUTO_EXPORT_START_TIME) /
FE2_PNGEX_AUTO_EXPORT_COUNT
first_png_time = FE2_PNGEX_AUTO_EXPORT_START_TIME
Subsequent PNG times will be calculated the final equation outlined in the
section.
sc = Flix2_AddFilter(&png_exporter_plgn, flix, FE2_FILTER_PNGEX);
if (sc == ON2_OK)
// set the first auto export time to 1 second
sc = Flix2_FilterSetParam(png_exporter_plgn,
FE2_PNGEX_AUTO_EXPORT_START_TIME, 1000);
Definition at line 289 of file png_export.h.
5.32.2.6
#define FE2_PNGEX_COMPRESSION_LEVEL
Filter parameter for setting compression level used by libpng.
Notes from png.h:
Set the library compression level. Currently, valid values range from 0 - 9, corresponding directly to the
zlib compression levels 0 - 9 (0 - no compression, 9 - "maximal" compression). Note that tests have shown
that zlib compression levels 3-6 usually perform as well as level 9 for PNG images, and do considerably
fewer caclulations. In the future, these values may not correspond directly to the zlib compression levels.
In addition to the above range, -1 corresponds to zlib’s default value.
Note:
Default: -1 (Z_DEFAULT_COMPRESSION)
Definition at line 370 of file png_export.h.
5.32.2.7
#define FE2_PNGEX_ENABLE_ALPHA
Filter parameter for preserving source video alpha channel data in exported PNG images.
If enabled, the PNG export filter preserves the source video alpha when exporting PNG images. This
setting will only produce PNG images with alpha channels if encoding Flash 8 Video with Alpha.
sc = Flix2_AddFilter(&png_exporter_plgn, flix, FE2_FILTER_PNGEX);
if (sc == ON2_OK)
// enable alpha preservation
sc = Flix2_FilterSetParam(png_exporter_plgn,
FE2_PNGEX_ENABLE_ALPHA, on2true);
Definition at line 172 of file png_export.h.
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