0, stream->stream(_format_context)->codec->channels, _frame->nb_samples, audio_sample_format (stream), 1
);
DCPOMATIC_ENABLE_WARNINGS
+ DCPOMATIC_ASSERT (size >= 0);
/* XXX: can't we just use _frame->nb_samples directly here? */
/* XXX: can't we use swr_convert() to do the format conversion? */