CONVERT
TS → FLV
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Situation. TS is the MPEG transport stream, used in broadcast and HLS streaming segments. Solution: a FLV, produced below. Repackaging a TS file into FLV is one of the fastest video jobs there is. When the codecs already match the target container specification, the bytes are literally copied across — no re-encoding, no quality drop, no long wait. Upload above and watch the progress bar usually fly. Background. TS is the MPEG transport stream, used in broadcast and HLS streaming segments. Destination side, FLV is the Adobe Flash Video container, now deprecated but still lingering in archives.
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MPEG Transport Stream
Source formatTS (Transport Stream) is used for broadcasting, streaming, and recording live TV.
Flash Video
Target formatFLV was the dominant web video format during the Flash era. While Flash is now deprecated, many legacy video files still exist in FLV format and need conversion to modern formats.
Why convert TS to FLV
Flash Video is better supported than MPEG Transport Stream across web uploads, social networks and consumer devices. Converting trades the niche advantages of TS for broad playback and fewer "file type not supported" messages. Stream copy (when codecs match) keeps the video bit-identical to the source.
HOW TO CONVERT
TS → FLV
Upload the TS
Drop your TS onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
Stream-copy or re-encode
FFmpeg probes the codecs; if compatible, it stream-copies (no quality loss). Otherwise it transcodes at matching bitrate.
Download the FLV
Fetch the converted FLV as soon as it is ready. Both files auto-delete within two hours.
Common Use Cases
Share across platforms
Send FLV files to anyone without worrying about whether they have the right software for TS.
Embed in documents
Drop FLV output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
FLV often produces smaller files than TS for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
TS vs FLV — Strengths and limitations
What each format does best, and where it falls short.
TS Strengths
- Designed for noisy channels — packet-level error correction.
- Multi-program: one TS can carry several TV channels.
- Native format for all digital TV broadcasts and HLS streaming.
- Streaming-first: no need to download whole file to start playing.
- 30+ years of stable, deployed infrastructure.
Limitations
- Packet overhead (~3% vs Program Stream).
- Seek index is implicit — requires scanning for random access.
- Multiple audio/subtitle selection requires parsing PMT (Program Map Tables).
FLV Strengths
- Low overhead — the container is extremely compact.
- Designed for streaming — progressive download and seeking work well.
- Decoded natively by Flash Player on every OS for 20 years.
Limitations
- Flash Player is dead — no modern browser can play FLV without conversion.
- Legacy codecs (Sorenson, VP6) are poorly supported in modern tooling.
- Hardware video decoders never added FLV support.
TS vs FLV — Technical specifications
Side-by-side comparison of the technical details.
TS
- MIME type
- video/mp2t
- Extensions
- .ts, .m2ts, .mts
- Standard
- ISO/IEC 13818-1 (MPEG-2 Systems)
- Packet size
- 188 bytes (standard); 192 bytes (M2TS/Blu-ray)
- Primary use
- Broadcast TV + HLS streaming
FLV
- MIME type
- video/x-flv
- Extensions
- .flv, .f4v
- Video codecs
- Sorenson Spark, VP6, H.264 (F4V)
- Audio codecs
- MP3, Nellymoser, AAC
- Status
- Deprecated since December 31, 2020
| Specification | TS | FLV |
|---|---|---|
| MIME type | video/mp2t | video/x-flv |
| Extensions | .ts, .m2ts, .mts | .flv, .f4v |
| Standard | ISO/IEC 13818-1 (MPEG-2 Systems) | — |
| Packet size | 188 bytes (standard); 192 bytes (M2TS/Blu-ray) | — |
| Primary use | Broadcast TV + HLS streaming | — |
| Video codecs | — | Sorenson Spark, VP6, H.264 (F4V) |
| Audio codecs | — | MP3, Nellymoser, AAC |
| Status | — | Deprecated since December 31, 2020 |
TS vs FLV — Typical file sizes
Approximate file sizes for common scenarios.
TS
- HLS video segment (6 seconds, 1080p) 2-5 MB
- 1 hour recorded TV (HD) 4-8 GB
- Satellite transponder capture (1 min) ~300 MB
FLV
- 10-min YouTube 2008-era video 40-80 MB
- 45-min TV show (FLV H.264) 200-500 MB
Quality & Compatibility
Stream-copy is bit-perfect: when the codecs inside TS match what FLV can carry, the frames are copied across without re-encoding and the output is visually identical to the source. When transcoding is required, we target CRF 20–23 H.264 — visually transparent for most content — and keep audio bitrate at 192 kbps AAC.
Tips for Best Results
- Stream-copy beats re-encoding by orders of magnitude — check if your TS already uses FLV-compatible codecs before picking Advanced settings.
- For social uploads, 1080p at 30 fps strikes the best quality-to-size ratio; 4K is often downscaled server-side anyway.
- Keep the TS if you plan further editing — transcoded FLV is fine for final delivery but not for intermediate edits.
Frequently Asked Questions
Only when it has to. If the codecs inside TS (usually H.264 or H.265 for video, AAC for audio) are accepted by FLV, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
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