MPG files store video using MPEG-1 or MPEG-2 compression alongside MP2 (MPEG Audio Layer 2) audio — the audio codec used in DVDs, Video CDs, and digital TV broadcasts. AAC (Advanced Audio Coding) is the successor to MP3 and MP2, offering significantly better compression efficiency. Converting MPG to AAC extracts the audio track and upgrades it from the aging MP2 codec to modern AAC, which delivers superior quality at lower bitrates and is universally supported by all modern devices.

MP2 audio in MPG files is a relic of the 1990s broadcast era. It requires higher bitrates to achieve the same quality as AAC — typically 192-384 kbps MP2 for what AAC achieves at 128 kbps. Converting to AAC produces smaller files with better or equivalent audio quality, and AAC is natively supported by every modern phone, tablet, computer, and web browser — unlike MP2 which requires specific decoder support.

FFmpeg demuxes the MPG container to extract the MP2 audio stream, decodes it to PCM, and re-encodes using the AAC encoder (native or libfdk_aac). Since MP2 and AAC are both lossy codecs, this is a transcode operation that introduces a second generation of lossy compression. The AAC bitrate should match or exceed the original MP2 bitrate to minimize additional quality loss. Typical MP2 bitrates in MPG files range from 128 to 384 kbps.

Resolution: 1920x1080

Bitrate: 8-12 Mbps

H.264 recommended for fast processing

Resolution: 1080x1080

Bitrate: 3.5 Mbps

Square or 9:16 for Reels

Resolution: 1080x1920

Bitrate: 4 Mbps

9:16 vertical, under 60s ideal

Resolution: 1280x720

Bitrate: 5 Mbps

Under 140s, 512MB max

Resolution: 960x540

Bitrate: 2 Mbps

16MB limit for standard, 64MB for document

Resolution: 1280x720

Bitrate: 4 Mbps

8MB free, 50MB Nitro

Yes, converting between two lossy formats introduces some additional quality degradation. Minimize this by using an AAC bitrate at or above the original MP2 bitrate.

128 kbps for general listening, 192 kbps for high quality, 256 kbps for audiophile-level preservation of the MP2 source content.

No, this conversion extracts only the audio. The video stream from the MPG file is discarded.

Most MPG files use MP2 audio. You can verify by checking the file's media info — tools like MediaInfo or FFprobe will show the audio codec.

Yes. AAC is supported by iOS, Android, Windows, macOS, all major web browsers, and virtually every media player released in the last 15 years.

Device	MPG	AAC
Windows PC	Partial	Partial
macOS	Partial	Native
iPhone/iPad	Partial	Native
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No	No

Tính năng	MPG	AAC
Tên đầy đủ	MPEG Video	Advanced Audio Coding
Phần mở rộng	.mpg	.aac
Phù hợp nhất cho	Universal support	Superior to MP3

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