If the MP4 container has chapter or stream metadata, we copy artist / title / album fields into the AIFF container where the AIFF format supports tags. Otherwise the AIFF file is untagged — use a tag editor (Mp3tag, Picard) post-export for richer tags.
从 MP4 文件提取 AIFF 需要多长时间?
+
Audio extraction is much faster than video re-encoding — typically 5-15% of source duration. A 1-hour MP4 -> AIFF finishes in 3-9 minutes on the standard pipeline.
Silent gaps usually mean the MP4 file had a multi-track audio layout and we picked the wrong stream. Use the "audio stream" option to explicitly pick stream 0, 1, etc., or re-mux all streams to a multi-track AIFF container where AIFF supports it.