From XiphWiki
Jump to navigation Jump to search

some samples to test your theora decoder

a decoder must play all these files without problems to comply with the theora specification.

320x240.ogg [0.3 MB]

  • simplest example

320x240.ogv [0.3 MB]

  • simple example with Skeleton Stream

320x240.skeleton+cmml.ogv [0.3 MB]

  • simple example with Skeleton and CMML Stream; decoders should read the Skeleton stream to identify the other streams in Ogg and ignore those that are not supported by the application

pixel_aspect_ratio.ogg [1.8 MB]

  • Aspect Ratio defined in header to 1.82/1 , it also has a theora comment header

videotestsrc-720x576-16-15.ogg [422K]

  • Aspect Ratio defined in header to 1.33/1 (PAL DVD format)

322x242_not-divisible-by-sixteen-framesize.ogg [0.3 MB]

  • both dimensions not divisible by 16 but still even - if you see a black border around the testimage you should have a look at the Spec/2.2 on page 22, to see how to use: ti.width, ti.height, ti.frame_width, ti.frame_height, ti.offset_x, ti.offset_y


  • one dimension divisible by 16 while the other one isn't


  • odd dimensions

chained_streams.ogg [2.4 MB]

  • all other samples as a chained stream. (see Spec/A.3.1 on page 157)

multi2.ogg [171 K]

  • another chained file

mobile_itu601_i_422.ogg [8 MB]

  • 4:2:2 pixel format, in the original spec and supported by the mainline decoder since alpha8 and the mainline encoder since 1.1.

ducks_take_off_444_720p25.ogg [7.2 MB]

  • Ogg Theora video 4:4:4 pixel format, 1280x720 pixels, 25 fps, 213 frames

stockholm-vfr.ogg [1.8 MB]

  • Hybrid 24fps/30fps clip encoded as 120fps with dropped frames.

offset_test.ogv [0.2 MB] (10 frames, 1 fps, no visible movement, visible frame 512 x 512)

sign_irene_cif-3qi-b.ogg [1.3 MB]

  • Ogg Theora video using 3qi (adaptive quantization).

chroma_siting_test.ogv [25K]

  • Ogg Theora video chroma siting test.

Player compliance

  • Firefox (3.6)
    • Seems to pass all tests (not sure about the 322x242 "not divisible by 16" - there is a black line ...)
    • But high requirements to play (especially large) videos, behaves badly if hardware is insufficient to play in real-time
  • MPLAYER (r30886 2010-03-13)
    • OGG and Theora support has been inferior for years (but mostly worked with encoders from given era), improved at beginning of 2010
    • Recently fixed issues:
      • 4:2:2 and 4:4:4 support (in previous versions they did "play", but looking "strangely") List discussion BUG #1487
      • Some videos encoded with recent (1.1) encoders complaining about "invalid frames" or hanging BUG #1664
    • Remaining issues:
      • Offset test fails, shows what shouldn't be visible BUG #1492, open since 2009-06-14
      • Output to YUV4MPEG always downsampled to 4:2:0 (flaw, no Bugzilla entry exists)
  • VLC 1.0.5
    • Theora decoder seems fully compliant, tiny problems specific to some videos or systems (fixing in progress)
    • Video duration is reported badly or not at all
  • DUGL Player 0.44
    • Theora decoder seems fully compliant, but no sound yet