Editing NotebookLM (section)

=== NotebookLM Workaround: Large Video to MP3 Conversion ===

'''Problem Description''': 

The original 2.3GB video file exceeded NotebookLM's strict 200MB limit for local uploads. As stated in their official documentation: "The current limit is 500,000 words per source or up to 200MB for local uploads."<ref>[https://support.google.com/notebooklm/answer/16269187?hl=en Frequently asked questions - NotebookLM Help]</ref> (每個檔案大小不得超過 200MB)

'''Solution:''' 

Use FFmpeg to convert the video to MP3 audio. Result: The file size was reduced to 126MB, successfully meeting the limit.

1. Download & install [https://www.ffmpeg.org/download.html Download FFmpeg]

2. Open the terminal

3. Command Used:

<pre>
ffmpeg -i input_video.mp4 -vn -c:a libmp3lame -q:a 2 output_audio.mp3
</pre>

Breakdown of flags:
* {{kbd | key=<nowiki>-i</nowiki>}} input_video.mp4: The input file.
* {{kbd | key=<nowiki>-vn</nowiki>}}: Skips the video stream (No Video).
* {{kbd | key=<nowiki>-c:a libmp3lame</nowiki>}}: Specifies the audio codec to use (LAME is standard for MP3).
* {{kbd | key=<nowiki>-q:a 2</nowiki>}}: Sets Variable Bit Rate (VBR) quality. 2 averages around 190 kbps (high quality). Use 0 for best quality or 4 for standard.
* {{kbd | key=<nowiki>output_audio.mp3</nowiki>}}: The name of the new file.