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Supports: F4V
F4V is Adobe's later Flash video format — an MP4-based container holding H.264 video and AAC audio — so it plays in few standalone players outside the old Flash ecosystem. This converter re-encodes it into an MPG (MPEG program stream) with MPEG-2 video and MP2 audio, the format hardware DVD players, set-top boxes, and legacy MPEG-only editing tools accept. Be clear on the trade-off: H.264 down to MPEG-2 is a lossy-to-lossy step that can't recover detail and, because MPEG-2 is less efficient, often produces a larger file. If your goal is modern playback rather than legacy hardware, F4V to MP4 is the better target.
| Property | F4V | MPG (MPEG program stream) |
|---|---|---|
| Origin | Adobe, December 2007 (Flash Player 9 Update 3) | MPEG-1 (1993) and MPEG-2 (1995) standards |
| Container basis | ISO base media file format (same lineage as MP4) | MPEG program stream — ISO/IEC 11172-1 / 13818-1 |
| Typical video codec | H.264 (MPEG-4 Part 10) | MPEG-2 Part 2 here (MPEG-1 if selected) |
| Typical audio codec | AAC | MP2 (MPEG-1 Audio Layer II); AC-3 for DVD targets |
| Compression efficiency | High (modern H.264) | Lower (1990s codec — bigger files at equal quality) |
| Hardware DVD / set-top playback | Rarely supported | Broadly supported |
| Best for | Legacy Flash / web delivery (now deprecated) | Hardware-player compatibility, DVD/VCD authoring, legacy MPEG tools |
The default output is an MPEG-2 program stream — the right pick for almost every use. Choose MPEG-1 only when you specifically need VCD-era compatibility. To shrink a finished file, use Compress MPG; to modernize into a small, widely playable file instead, MPG to MP4 re-encodes to H.264.
Yes — it is a lossy-to-lossy re-encode. F4V carries H.264 video and AAC audio, while this MPG output holds MPEG-2 video and MP2 audio, so the picture is fully decoded and re-encoded to an older codec with no lossless remux path between them. You can't recover detail the original H.264 encode already discarded. To minimize the loss, leave the Quality Preset on "Very High (Recommended)" or pick a high Constant Quality setting, keep the source resolution and frame rate, and avoid repeated round-trip conversions — each one degrades the picture further.
Because MPEG-2 is a 1990s codec while the H.264 inside your F4V is far more efficient — roughly 2× the compression at the same visual quality. Re-encoding H.264 into MPEG-2 usually grows the file because the older codec needs more bits to match perceived quality. This is expected, and the payoff is universal hardware-player and DVD-authoring compatibility. If size matters more than legacy playback, convert to F4V to MP4 for a much smaller H.264 file, or lower the resolution / bitrate target here.
The MPG file is the source, not a finished disc. For a hardware DVD-Video player the stream must be MPEG-2 at 720×480 (NTSC) or 720×576 (PAL), at or below 9.8 Mbit/s video bitrate, with MP2 or AC-3 audio — then authored into a VIDEO_TS structure and burned. XConvert produces a compliant MPEG-2 .mpg; run it through a free authoring tool like DVDStyler to add menus and burn. For a newer disc-free player, copying the .mpg to a USB stick often plays directly with no authoring step.
MPEG-2 by default, which is what DVD-Video and most disc-authoring tools expect. You can switch the video codec to MPEG-1 only if you're targeting Video CD or an older device that specifically requires it. In our testing, a short standard-definition F4V clip converted at the default "Very High (Recommended)" preset produced an MPEG-2 .mpg slightly larger than the source — normal, given the older codec is less efficient than the H.264 it replaced.
Pick MPG only for compatibility with something that won't accept MP4: a DVD-authoring pipeline, a legacy broadcast or kiosk system, or a dated editor that reads MPEG program streams. For everything modern — phones, browsers, messaging, and smaller files at the same quality — F4V to MP4 keeps the H.264 already inside your F4V and simply rewraps it into a current container, which is faster and avoids a quality-losing re-encode.
There's no fixed file-count cap, and conversion runs on our servers rather than your machine, so the real constraint is upload size and connection speed — a large .f4v simply takes longer to upload before encoding starts. You can queue several files in one batch and download them individually or as a single ZIP. Files are removed from our servers automatically after a few hours.