MPG files carry MPEG-1/MPEG-2 video with MP2 audio from DVDs, Video CDs, and broadcast recordings, while AMR (Adaptive Multi-Rate) is a narrowband speech codec operating at 4.75-12.2 kbps with 8 kHz sampling — the standard voice codec for GSM cellular networks. Converting MPG to AMR extracts the audio, downsamples it drastically, and encodes it exclusively for voice-quality speech delivery on cellular devices.

AMR exists for one purpose: transmitting voice over cellular networks at the lowest possible bitrate. If you need to extract speech (dialogue, narration, commentary) from MPG recordings and deliver it via MMS, embed it in telephony systems, or store it on devices with extreme storage limitations, AMR provides functional voice quality at approximately 1 KB per second.

FFmpeg decodes the MP2 audio from the MPG container, downsamples from the original rate (typically 44.1 or 48 kHz) to 8 kHz mono, and encodes using libopencore_amrnb. The output is a raw AMR file with the standard #!AMR file header. The codec operates at adaptive bitrates between 4.75 and 12.2 kbps, optimized for frequencies between 300 and 3400 Hz — the human voice range.

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

No. AMR is limited to 300-3400 Hz at 8 kHz sampling. Music, bass frequencies, and high-frequency detail from the MPG audio are completely lost.

Extreme compression — a 192 kbps MP2 stream becomes approximately 12 kbps in AMR, a 16:1 reduction in data rate.

No. AMR is strictly for voice communication. For archiving, use FLAC, ALAC, or even AAC which preserves much more of the original audio quality.

Yes. Both Android and iOS can play AMR files natively, as it remains the standard format for voice recordings on many phone platforms.

AMR is mono only at 8 kHz. Stereo MPG audio is automatically mixed down to a single mono channel during conversion.

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

Feature	MPG	AMR
Full Name	MPEG Video	Adaptive Multi-Rate Audio
Extension	.mpg	.amr
Best For	Universal support	Speech optimized

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