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video_writer->append_audio
video_writer ->append_audio: data=char_array, format=[{u8,s8,s16,s32,f32}], frequency=[1..], channels=[1..8]
Add samples to the sound, as audio_stream->append does. The data holds samples of format (default s16) at frequency with channels, by default those of the sound of the video. They are converted to the format of the video. If video_writer->audio was not used, the first samples set the format of the sound. The sound starts at the start of the video and has no gaps.
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