Set the average bitrate. The instantaneous bitrate can be much higher or lower at any point in time. But the average over a long duration will be the value set here. If you need to limit instantaneous bitrate, look into x264's vbv-bufsize and vbv-maxrate settings. NSIsNotNil 0 0 NSNegateBoolean Output framerate. 'Same as source' variable framerate is recommended. Peak framerate is 'same as source' VFR with a peak rate. VFR is incompatible with some players. NSIsNotNil HBFrameRateTransformer Perform 2-pass encoding. 'Bitrate' rate control is a prerequisite. During the 1st pass, statistics about the video are collected. Then in the second pass, those statistics are used to make bitrate allocation decisions. NSIsNotNil NSNegateBoolean NSIsNotNil NSNegateBoolean NSNegateBoolean NSNegateBoolean NSIsNotNil HBVideoEncoderTransformer Set the desired quality factor. The encoder targets a certain quality. The scale used by each video encoder is different.
x264's scale is logarithmic and lower values coorespond to higher quality. So small decreases in value will result in progressively larger increases in the resulting file size. A value of 0 means lossless and will result in a file size that is larger than the original source, unless the source was also lossless.
FFmpeg and Theora's scales are more linear. These encoders do not have a lossless mode. Set the average bitrate. The instantaneous bitrate can be much higher or lower at any point in time. But the average over a long duration will be the value set here. If you need to limit instantaneous bitrate, look into x264's vbv-bufsize and vbv-maxrate settings. NSIsNotNil NSIsNotNil Set the desired quality factor. The encoder targets a certain quality. The scale used by each video encoder is different.
x264's scale is logarithmic and lower values coorespond to higher quality. So small decreases in value will result in progressively larger increases in the resulting file size. A value of 0 means lossless and will result in a file size that is larger than the original source, unless the source was also lossless.
FFmpeg and Theora's scales are more linear. These encoders do not have a lossless mode. NSIsNotNil HBQualityTransformer Adjust encoder settings to trade off compression efficiency against encoding speed. This estabilishes your default encoder settings. Tunes, profiles, levels and advances option string will be applied to this. You should generally set this option to the slowest you can bear since slower settings will result in better quality or smaller files. Tune settings to optimize for common scenarios. This can improve efficiency for particular source characteristics or set characteristics of the output file. Changes will be applied after the preset but before all other parameters. none Sets and ensures compliance with the specified profile. Overrides all other settings. auto auto Reduce decoder CPU usage. Set this if your device is struggling to play the output (dropped frames). NSNegateBoolean NSIsNotNil