Convert M3U8 to MP4 with FFmpeg: Complete Guide

The simplest FFmpeg command to convert an M3U8 stream to MP4:

ffmpeg -i "https://example.com/stream.m3u8" -c copy -bsf:a aac_adtstoasc output.mp4

This downloads the stream and copies the video and audio streams directly into an MP4 container without re-encoding. It's fast (download speed limited only by your connection) and preserves original quality.

• -i — Input file (the M3U8 URL)
• -c copy — Copy all streams without re-encoding (stream copy mode)
• -c:v libx264 — Re-encode video using H.264 codec
• -c:a aac — Re-encode audio using AAC codec
• -bsf:a aac_adtstoasc — Bitstream filter for AAC audio (needed for MP4 compatibility)
• -crf 23 — Quality level (lower = better, 18-28 typical range)

Some streams use codecs not natively supported in MP4. In that case, re-encode:

ffmpeg -i "https://example.com/stream.m3u8" -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k output.mp4

For multi-bitrate streams, select a specific variant:

ffmpeg -i "https://example.com/master.m3u8" -map 0:v:0 -map 0:a:0 -c copy output.mp4

The -map 0:v:0 selects the first video stream (usually the highest quality). Change the index to select different variants.

• "Protocol not found" — Add -protocol_whitelist file,http,https,tcp,tls,crypto
• "Invalid data found" — Try adding -allowed_extensions ALL before -i
• "Operation not permitted" — Check if the stream is encrypted (need decryption key)
• No audio — Some streams have separate audio playlists. Use -map 0:a to include audio