What is the MPEG file format?
.mpeg files store video encoded with the MPEG-1 or MPEG-2 standard, developed by the Moving Picture Experts Group under ISO/IEC. The extension is identical in content to .mpg - .mpg was the 8.3 DOS filename convention variant of the same format.
Both extensions identify an MPEG program stream: a binary file interleaving packetized video and audio with PTS/DTS timestamps for synchronized playback. All program streams open with the 4-byte pack-start code 00 00 01 BA; the fifth byte distinguishes MPEG-1 (0x21) from MPEG-2 (0x44).
MPEG-1 (ISO/IEC 11172, 1993) targets CD-ROM and Video CD at roughly 1.5 Mb/s, delivering typical resolutions of 352×240 (NTSC) or 352×288 (PAL) with MPEG Layer II audio. MPEG-2 (ISO/IEC 13818, 1995) raised the ceiling to approximately 9.8 Mb/s for DVD and broadcast television, supporting 720×480 or 720×576 resolution and AC-3 audio on DVD-derived streams.
The .mpeg stream is essentially the same program stream a DVD stores as a .VOB file - remuxing between the two is near-lossless. For modern distribution, .mpeg has been superseded by MP4 with H.264 or H.265. Converting .mpeg to MP4 using HandBrake or FFmpeg is the most common workflow today; VLC plays .mpeg on all major platforms without additional codecs.
Security & safety
RISK: LOW.mpeg is inert video data - safe to play. Practical warnings: fake 'MPEG codec pack' and 'video converter' sites are a common adware/PUP vector. Install VLC (videolan.org) and HandBrake (handbrake.fr) only from official sources. Online converters upload your (possibly private) video to third parties; use local tools for personal footage. DVD-derived .mpeg may carry copy-protection/legal considerations from the source disc.
Format details
in a nutshellPrograms that open MPEG files
Windows3 apps
Windows Media Player
Built-in Double-click to play - modern Windows includes MPEG-2 decoding for most .mpeg files. 
HandBrake
Open-source Open the .mpeg, choose an MP4 preset, Start - converts MPEG to modern H.264/H.265 MP4. 
macOS3 apps
VLC media player
Open-source Open the .mpeg in VLC; QuickTime no longer reliably plays MPEG-1/2, so VLC is the safe choice. 
Linux2 apps
GNOME Videos (Totem)
Open-source Open in the default GNOME player (requires GStreamer MPEG plugins). 
Android1 app
VLC for Mobile
Open-source Add .mpeg via Files/cloud and play in VLC; built-in iOS player may not handle MPEG-1/2. Technical details
deep spec| MIME type | video/mpeg |
| Magic bytes | 00 00 01 BA (pack-start code) at offset 0; raw video elementary streams begin with 00 00 01 B3 |
| MPEG-1 vs MPEG-2 | Distinguished by the 5th byte: 0x21 indicates MPEG-1; 0x44 indicates MPEG-2 |
| Stream type | MPEG-1 System Stream or MPEG-2 Program Stream (PS) - multiplexed video and audio packets |
| Video codec | MPEG-1 Part 2 (MPEG-1 video) or MPEG-2 Part 2 / H.262 (MPEG-2 video) |
| Audio codec | MPEG-1 Layer I/II (MP2) for MPEG-1 streams; AC-3 or LPCM common on DVD-derived MPEG-2 streams |
| Byte order | Big-endian (MSB-first bitstream per MPEG standard) |
| Color encoding | YCbCr 4:2:0 chroma subsampling, 8 bits per component |
| Typical resolutions | MPEG-1: 352×240 or 352×288 (VCD); MPEG-2: 720×480 or 720×576 (DVD); spec maximum 1920×1152 |
| Bitrate range | MPEG-1 up to approximately 1.5 Mb/s; MPEG-2 up to approximately 9.8 Mb/s (DVD profile) |
| Audio sample rates | 32 kHz, 44.1 kHz, or 48 kHz for MPEG-1 audio; 48 kHz standard for DVD AC-3 |
| Relationship to VOB | Structurally identical to DVD .VOB program streams; remuxing between .mpeg and .vob is near-lossless |
| Typical file size | Tens of MB to a few GB depending on duration and bitrate |
| Released | MPEG-1: 1993 (ISO/IEC 11172); MPEG-2: 1995 (ISO/IEC 13818) |
| Latest version | MPEG-2 (ISO/IEC 13818); .mpeg is a legacy container - superseded for new content by MP4/H.264 |
| Open standard | Yes · royalty-free |
| Specification | www.iso.org |
MPEG conversions
Community Q&A
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