TS vs Y4M
A detailed comparison of MPEG Transport Stream and YUV4MPEG2 — file size, quality, compatibility, and which format to choose for your workflow.
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Technical Specifications
| Specification | .TS | .Y4M |
|---|---|---|
| MIME type | video/mp2t | video/x-yuv4mpeg2 |
| 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 | — |
| Extension | — | .y4m |
| Pixel format | — | YUV 4:2:0, 4:2:2, 4:4:4 |
| Header | — | ASCII single line |
Strengths Comparison
.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.
.Y4M Strengths
- Uncompressed raw YUV — codec benchmark truth.
- Dead-simple header.
- Universal codec development support.
Limitations
.TS — 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).
- fMP4 is gradually replacing TS for modern low-latency streaming.
.Y4M — Limitations
- Enormous file sizes.
- Development-only — not for consumption.
- No metadata beyond basic stream params.
Frequently Asked Questions
TS (MPEG Transport Stream) is a video container format that bundles one or more video streams, audio tracks, and optional subtitles into a single file. The container format determines how metadata is organised and which codecs can live inside; the visual quality itself depends on the codec (H.264, H.265, VP9, AV1) rather than the TS wrapper. It is part of the video files family.
Y4M (YUV4MPEG2) is a video container format that bundles one or more video streams, audio tracks, and optional subtitles into a single file. The container format determines how metadata is organised and which codecs can live inside; the visual quality itself depends on the codec (H.264, H.265, VP9, AV1) rather than the Y4M wrapper. It is part of the video files family.
VLC, MPV and PotPlayer play nearly every TS file on desktop. Browser support varies: modern Chromium, Firefox and Safari play common containers via the HTML5 <video> tag, but niche TS variants may fail. If a device refuses your TS, convert to MP4 with our TS to MP4 converter for universal playback.
VLC, MPV and PotPlayer play nearly every Y4M file on desktop. Browser support varies: modern Chromium, Firefox and Safari play common containers via the HTML5 <video> tag, but niche Y4M variants may fail. If a device refuses your Y4M, convert to MP4 with our Y4M to MP4 converter for universal playback.
Upload your TS to KaijuConverter and pick MP4, MOV, MKV, WebM, or any other target. Our pipeline uses FFmpeg under the hood and stream-copies when codecs are compatible (no quality loss) or transcodes at high-quality defaults otherwise. Conversion runs server-side; both files delete within two hours.
Only when the target requires re-encoding. If the codecs inside TS match what the target container supports, FFmpeg stream-copies the streams and the output is bit-identical to the source. Transcoding uses transparent quality defaults (CRF 20–23 H.264) and produces output indistinguishable from the original at normal viewing distance.
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