yt-dlp -f 134+140 [URL] combines the 134 video with the standard 128k M4A audio stream. Summary Table: Format 134 vs. Peers Format Code Resolution Stream Type 133 Video Only 134 360p H.264 Video Only 135 Video Only 243 Video Only (WebM)

Typically 640x360 or 480x360, commonly known as 360p . Codec: Uses AVC1 (H.264) , specifically profile avc1.4d401e .

By separating the video (134) from the audio, platforms can swap video quality on the fly without interrupting the sound, providing a seamless experience when your signal drops. How to Use Format 134 (for Power Users)

When a video is uploaded to a major platform, it is transcoded into multiple "format codes" to support Dynamic Adaptive Streaming over HTTP (DASH). Format 134 is a standardized identifier for a specific set of technical specifications:

yt-dlp -F [URL] will show you if format 134 is available for a specific video.

yt-dlp -f 134 [URL] will fetch the 360p video-only file.