What MPEG-TS diagnostics does this tool report?

It detects 188, 192, or 204-byte packet layouts; parses PAT and PMT program tables; inventories PIDs and mapped codecs; checks PSI CRCs, sync bytes, transport-error indicators, scrambling, and continuity counters; and derives bounded PCR, PTS, bitrate, and keyframe evidence.

When can a TS file be losslessly remuxed to MP4?

The narrow browser path requires one unscrambled H.264/AVC video stream plus optional AAC/ADTS audio in a valid program map. FFmpeg copies packets into MP4 without re-encoding. MPEG-2 video, HEVC, AC-3, unsupported audio, encrypted streams, and incomplete program maps remain diagnostics-only.

Is lossless TS trimming frame-accurate?

No. Without re-encoding, the start is snapped backward to a detected keyframe and the end is approximate at packet or frame boundaries. The chosen and actual start times are shown before download.

How are keyframe thumbnails made?

For compatible streams, the browser first makes a local stream-copy MP4 preview, seeks to detected H.264 random-access or IDR timestamps, and draws thumbnails locally. Source codecs are not re-encoded for the MP4.

Are TS fileзагружаны?

Local TS files stay in the browser. URL mode contacts the supplied host directly and requires its CORS permission. The pinned FFmpeg WebAssembly runtime is served by manuals.plus.

Packet-level diagnosticsLocal stream-copy tools

TS Diagnostics, Trim & Lossless MP4 Remux

Inspect MPEG transport-stream programs, PIDs, codecs, timing, continuity errors, scrambling, and keyframes. For a narrowly compatible H.264/AAC program, preview keyframes, choose a trim range, and copy the streams into MP4 without re-encoding.

Compatibility first: MP4 output is enabled only for one unscrambled H.264 video stream plus optional AAC/ADTS audio. MPEG-2 video, HEVC, AC-3, encrypted/scrambled streams, missing program maps, and other variants remain diagnostics-only. Lossless trim starts snap to a detected keyframe.

Ready. Choose a transport stream or run the sample diagnostics.

Мясцовы files remain in this browser. Diagnostics are capped at 256 MiB; the pinned 31 MiB FFmpeg runtime is loaded only for compatible preview/remux operations, which are capped at 96 MiB.

Transport-stream summary

Packet layoutСумленнасцьMP4 status

Пакеты0

Працягласць—

Праграмы0

PID0

Continuity errors0

Ключавыя кадры0

PAT / PMT program and codec table

Program association and program-map sections are CRC-checked before their elementary PIDs and codecs are reported.

праграма	PMT PID	PCR PID	Stream PID	Кодэк	PSI / descriptors

PID traffic and error report

Bitrates are estimates from packet counts and the recovered duration. Null packets remain visible but do not create continuity errors.

PID	Role / codec	Пакеты	Бітрэйт	Пераемнасць	ТЭІ	Скрэмблаваны	Выпадковы доступ

Lossless trim and MP4 remux

Requested start (seconds)

End (seconds)

A compatible stream and detected keyframe are required for lossless trim planning.

“Lossless” means codec packets are copied with -c copy; the MP4 container is new. Trim is keyframe-aligned and not frame-accurate.

Compatible MP4 preview and keyframe thumbnails

Без папярэднягаview prepared. Diagnostics do not require decoding; preview and thumbnails load the pinned local FFmpeg runtime only when requested.

Prepare the compatible MP4 preview to render keyframe thumbnails.

Local processing log

TS diagnostic and remux boundaries

Packet layoutsDetects standard 188-byte TS, 192-byte M2TS prefix, and 204-byte Reed–Solomon trailer layouts.

Program evidenceParses PAT and PMT sections, verifies MPEG-2 CRC-32, and reports program, PCR, stream, descriptor, and codec mappings.

Error evidenceReports sync, transport-error, PSI CRC, scrambling, duplicates, and per-PID continuity-counter gaps.

Timing and keyframesUses bounded PCR/PTS evidence and H.264 random-access or IDR markers; counts are diagnostic, not a full decode index.

Lossless MP4 pathOne H.264 video plus optional AAC/ADTS audio; other codecs are identified but deliberately not copied to MP4 here.

No repair claimRemux does not repair missing packets, decrypt streams, correct timestamps, transcode unsupported codecs, or guarantee broadcast compliance.

TS diagnostics and remux questions

What does the PID/program report prove?

It reports packet-level structures actually recovered from the file: PAT and PMT sections, their CRC status, mapped PIDs/codecs, PCR PID, traffic counts, transport-error flags, continuity counters, scrambling control, and bounded timing evidence.

Which TS files can be remuxed losslessly to MP4?

This route intentionally enables stream copy only for one unscrambled H.264/AVC video stream plus optional AAC/ADTS audio. Unsupported codecs and incomplete program maps remain visible in diagnostics but do not receive a misleading conversion button.

Why can the trim start move earlier?

Starting between keyframes would require decoding and re-encoding part of the video. The lossless path instead snaps backward to the nearest detected keyframe and shows the actual chosen time. End time remains approximate.

Does a continuity error prove visible corruption?

No. It proves an unexpected continuity-counter transition on a PID. The missing or repeated packet may affect video, audio, metadata, or nothing visible; the per-PID table provides the context.

Ёсць files uploaded or transcoded?

Мясцовы files remain in the browser. Compatible MP4 output uses a pinned local FFmpeg WebAssembly runtime with codec copy, not transcoding. URL mode contacts only the URL you provide and requires CORS permission.