MPG is the legacy disc and broadcast format using MPEG-1/MPEG-2 codecs, while FLV (Flash Video) was Adobe's proprietary streaming format that dominated web video from roughly 2005 to 2015. FLV supported Sorenson Spark, VP6, and eventually H.264 video with MP3 or AAC audio. While Flash Player has been discontinued since 2020, FLV files are still encountered in legacy web archives, old content management systems, and RTMP streaming infrastructure.

Converting MPG to FLV serves legacy scenarios where FLV format is specifically required. Older content management systems, Flash-based e-learning platforms, and RTMP streaming servers may still need FLV input. Some digital media archives also contain large FLV collections, and adding MPG content requires format consistency. While no one should start new FLV projects, maintaining existing Flash-era infrastructure sometimes necessitates this conversion.

FFmpeg decodes MPEG-1/2 video and MP2 audio from the MPG container, then re-encodes to H.264 (or H.263 for strict Flash 7 compatibility) with AAC or MP3 audio in the FLV container. The FLV container supports H.264+AAC since Flash Player 9 Update 3. Injecting onMetaData events ensures proper seeking in Flash-based players. Keyframe placement every 2 seconds supports RTMP stream switching.

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No. FLV is obsolete. Use MP4 (H.264+AAC) for universal compatibility or WebM (VP9+Opus) for open-source web publishing.

No modern browser supports FLV playback. Flash Player was removed from all browsers by the end of 2020.

H.264 for the best quality. Use Sorenson Spark only if the target system requires Flash Player 7 compatibility.

Yes. RTMP streaming servers (Wowza, Nginx-RTMP) often use FLV as the container format for live streams. This is one of the few remaining legitimate uses for FLV.

FLV with H.264 is typically 30-50% smaller than MPEG-2 MPG at equivalent quality, since H.264 is a much more efficient codec.

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

Funktion	MPG	FLV
Fulde navn	MPEG Video	Flash Video
Filendelse	.mpg	.flv
Bedst til	Universal support	Small file size

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