Global av_samples_alloc (uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align): return the size of the allocated buffer in case of success at the next bump
Global avcodec_fill_audio_frame (AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align): return the size in bytes required to store the samples in case of success, at the next libavutil bump
Global avformat_find_stream_info (AVFormatContext *ic, AVDictionary **options): Let the user decide somehow what information is needed so that we do not waste time getting stuff the user does not need.
Global AVOption::help: What about other languages?