Step 1: Provide your FLV files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted MPEG files.
FLV to MPEG Conversion FAQ
How do I convert FLV to MPEG without re-encoding the video stream?
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When the FLV and MPEG containers can both carry the same codec (H.264, H.265, VP9, AV1), the converter falls back to a remux: the elementary streams are copied byte-for-byte into the MPEG container and only the wrapper changes. A remux of a 1 GB FLV into MPEG typically finishes in 5-15 seconds with zero quality loss. FLV typically holds Sorenson Spark or H.264 video with MP3 or AAC audio, wrapped in a stream format designed for RTMP delivery. The video is MPEG-1 or MPEG-2 with MP2 or AC-3 audio, multiplexed into a stream designed to be decoded by fixed-function hardware.
Can the MPEG hold more than one audio track?
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Yes, and it is a real upgrade over FLV. MPEG treats every audio stream as a first-class track, so an original-language mix, a dub and a director commentary can live in one file with the player switching between them on demand. MPEG program streams are decoded by literally every DVD player, set-top box and broadcast chain ever built, and they tolerate bit errors gracefully.
Is there any point converting between two legacy formats like FLV and MPEG?
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Only if a specific piece of equipment demands the target. Both formats come from the same pre-H.264 era, so neither conversion buys efficiency, quality or future-proofing — it buys compatibility with one particular device. If the goal is to keep the footage usable long-term, convert to a current container instead of sideways. No current browser, phone or TV can play FLV — anything still in this container has to be moved out of it to remain watchable. MPEG-2 needs roughly four to six times the bitrate of H.264 for the same picture, and its content is frequently interlaced, which looks combed on modern displays.
Will multi-track audio survive FLV to MPEG conversion?
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Yes — every audio track in the FLV (director commentary, alternate languages, descriptive audio) is preserved in the MPEG when the target container supports multi-stream audio. MKV and MOV handle unlimited audio tracks; MP4 supports many but some hardware players only see track 1; WebM is capped at one Opus / Vorbis track. MPEG here means an MPEG-1 or MPEG-2 program stream, the format standardised for Video CD and then for DVD and broadcast television.
Are subtitle tracks preserved when converting FLV to MPEG?
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Soft subtitles (selectable tracks) survive when MPEG can carry them: MKV holds SRT, ASS, SSA, PGS, VobSub natively; MP4 only holds mov_text (a stripped-down format). Converting an MKV with ASS styled subs to MP4 will typically downgrade them to mov_text or burn them in. Hardsubs (burned into the video) carry over regardless.
Does FLV to MPEG keep chapter markers / DVD-style navigation?
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Chapter metadata transfers between FLV and MPEG whenever both containers support a chapter atom (MKV, MP4, MOV). WebM stores chapters in a Matroska-compatible block, so MKV <-> WebM chapters round-trip cleanly. AVI has no chapter spec at all, so an AVI source arrives with no chapters to carry across and an AVI target cannot store the ones it was handed; add markers manually afterwards if you need them.
What about MKV attachments (fonts, cover art) when going FLV to MPEG?
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MKV is the only mainstream container that stores arbitrary attached files (TTF fonts for ASS subs, JPG cover art, fan-translated PDF inserts). Going from FLV to MPEG drops these attachments when MPEG is not MKV — the elementary streams convert, but the attached payload stays in the source. Keep FLV as a backup if you depend on attached fonts.
Which codec does the MPEG output use by default?
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The default codec is chosen to match the MPEG container conservatively: MKV defaults to H.265 (HEVC) for better compression; MP4 defaults to H.264 for the widest device support; WebM defaults to VP9; AVI uses MPEG-4 ASP (DivX/Xvid lineage). Override via the advanced codec dropdown — AV1 is available for MKV / WebM where you want maximum compression and can wait through the encode.
How does HDR (HDR10, Dolby Vision) survive FLV to MPEG?
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HDR static metadata (HDR10 mastering display values, max content light level) carries through to MPEG when both containers and the chosen codec support it (HEVC, AV1 in MKV / MP4). Dolby Vision is more fragile — DV profile 5 / 7 / 8.1 in FLV commonly survives only into MKV with HEVC; converting to an MPEG container that does not carry the DV layer flattens to HDR10.
Will the FLV to MPEG converter keep variable framerate (VFR)?
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MKV and WebM record real per-frame timestamps and handle VFR natively, so FLV VFR survives into an MPEG of those formats with no resampling. MP4 nominally stores timestamps too but some players assume CFR; the converter exposes a "force CFR" toggle that resamples VFR FLV to 24 / 30 / 60 fps MPEG for problematic targets.
Why is my MPEG file smaller / larger than the FLV after conversion?
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Same-codec remux produces a near-identical size (container overhead differs by 0.1-2%). A codec change can swing the size by 50% or more: H.264 to H.265 typically halves the file at the same visual quality; H.264 to AV1 halves it again on a slow preset. Going from a high-bitrate FLV (Blu-ray rip) to a low-bitrate MPEG (web upload) is the most common reason for a dramatic drop.
Does the FLV to MPEG converter handle 4K / 8K / 60fps content?
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Yes up to 8K (7680x4320) on Premium. Free tier handles 4K (3840x2160) up to the 1 GB file cap. Pure remuxes (same-codec passthrough) of large FLV into MPEG are limited by disk I/O, not CPU — a 30 GB FLV typically remuxes to MPEG in under a minute regardless of resolution. Re-encodes scale with pixel count.
