CONVERT
Y4M → TS
Fast, secure Y4M to TS conversion. No registration required.
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Here is the short version — Y4M is a video container, so playback depends on the codec inside as well as the wrapper itself. Hence the need for TS. If you need a TS version of a Y4M clip for a social platform, a stock site or a CMS upload widget, this tool handles the job without re-rendering anything when it does not have to. The output is the same pixel data in a container the destination actually accepts. One more beat. Y4M is a video container, so playback depends on the codec inside as well as the wrapper itself. Receiving format: TS is the MPEG transport stream, used in broadcast and HLS streaming segments.
YUV4MPEG2
Source formatYUV4MPEG2 (Y4M) is a simple uncompressed video format that stores raw YUV pixel data with a minimal header. It is widely used as an intermediate format for video processing and quality benchmarking where no compression artifacts are acceptable.
MPEG Transport Stream
Target formatTS (Transport Stream) is used for broadcasting, streaming, and recording live TV.
Why convert Y4M to TS
Sending Y4M to someone on a non-matching operating system frequently leads to "file cannot be opened". TS avoids that by sitting in the middle of everyone's compatibility list. The repackage runs quickly and without generational loss when codecs already align.
HOW TO CONVERT
Y4M → TS
Drop the video file
Select a Y4M file. We read the container and stream descriptors to plan the conversion.
FFmpeg handles the repackage
When codecs align, FFmpeg rewraps the existing streams into a TS container — no quality loss, near-instant finish.
Retrieve the TS
The TS download is ready in seconds for stream-copy jobs, minutes for full transcodes.
Common Use Cases
Video editing import
Premiere, Final Cut and DaVinci Resolve scrub TS smoothly; some Y4M variants cause playhead judder.
Email and chat attachments
Gmail previews TS inline; Slack and Discord create inline players. Y4M tends to arrive as a generic file attachment.
Archival and cloud storage
Google Drive, Dropbox and OneDrive stream TS in their web players — Y4M triggers a download-to-view.
Conference and webinar recordings
Zoom, Teams and Meet export recordings compatibly with TS; Y4M may need a conversion step before distribution.
Y4M vs TS — Strengths and limitations
What each format does best, and where it falls short.
Y4M Strengths
- Uncompressed raw YUV — codec benchmark truth.
- Dead-simple header.
- Universal codec development support.
Limitations
- Enormous file sizes.
- Development-only — not for consumption.
- No metadata beyond basic stream params.
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).
Y4M vs TS — Technical specifications
Side-by-side comparison of the technical details.
| Specification | Y4M | TS |
|---|---|---|
| MIME type | video/x-yuv4mpeg2 | video/mp2t |
| Extension | .y4m | — |
| Pixel format | YUV 4:2:0, 4:2:2, 4:4:4 | — |
| Header | ASCII single line | — |
| 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 |
Y4M vs TS — Typical file sizes
Approximate file sizes for common scenarios.
Y4M
- 10 sec 1080p Y4M ~600 MB
- 1 min 4K Y4M ~14 GB
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
Quality & Compatibility
Resolution, frame rate and colour space are preserved end-to-end. If the TS container does not support some Y4M features (chapters, multiple subtitle tracks, DRM-protected streams), those are flattened or dropped with a warning. Hard-coded subtitles in the video frames always survive.
Tips for Best Results
- Embedded subtitle tracks convert between Y4M and TS when both containers support the same subtitle codec; otherwise burn the subtitles into the video first.
- For portrait (9:16) clips, make sure the TS encoder preserves the correct display aspect ratio — some players default to 16:9 if SAR is ambiguous.
- Long recordings (over an hour) benefit from chapter metadata; TS may not preserve Y4M chapters — check before relying on them.
Frequently Asked Questions
Frequently Asked Questions
Only when it has to. If the codecs inside Y4M (usually H.264 or H.265 for video, AAC for audio) are accepted by TS, 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".
RELATED CONVERSIONS
Other popular pairs involving Y4M or TS
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Related comparisons
See these formats side by side to understand which fits your use case best.
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Read guideSecure & Private Conversion
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