Portrait video rotated by the display matrix

edge/rotation-90-display-matrix.mp4MP4Edge case

An MP4 whose picture is stored sideways with a rotation flag, the way phones record portrait video.

How it should play

What a broken player shows

An illustration of the symptom, not a frame from the file.

What goes wrong

Players that ignore the flag show the video sideways, or squeezed into the wrong aspect.

The file

Container: MP4, 6 s
Size: 5.5 MB
Video: H.264, 1920x1080, 30 fps
Audio: AAC, stereo, 48,000 Hz
Expected: plays correctly in any player

How it was verified

Built by the testsrc generator (gen v0.2) and verified with FFmpeg 7.1.5-0+deb13u1 and GStreamer 1.26.2 in snapshot 2026-11-02, before it was published: the file has the property this page describes, and decoding it gives the expected result.

With a token: the file, how exactly it was built, the full fact sheet, and the expected result the checker judges a player against.

Use it

# the public facts
curl https://testsrc.com/v1/cases/edge/rotation-90-display-matrix.mp4

# the full fact sheet and the file, with your token
curl -H "Authorization: Bearer $TESTSRC_TOKEN" \
  https://testsrc.com/v1/cases/edge/rotation-90-display-matrix.mp4/facts
curl -H "Authorization: Bearer $TESTSRC_TOKEN" -o rotation-90-display-matrix.mp4 \
  https://testsrc.com/v1/files/edge/rotation-90-display-matrix.mp4

# play it through your player and check what it showed
testsrc run --player libvlc edge/rotation-90-display-matrix.mp4

See the API reference for tokens, quotas and snapshots.

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Portrait video rotated by the display matrix

What goes wrong

The file

How it was verified

Use it

More on orientation and aspect