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[Smola Martin]

input data?


Input data?
What is important for guick solving track and clear camera trajectory

1) size input data? bigger size is better?
HDTV - 1920x1080 ,...resize 1280x720 , 720x405

2) Depends on codec? - Huffyuv, VP6, Xvid, ....etc. which codec is most suitable

3) how long sequences is common for track. When I tryed track app I tracked about 300frames. Time and result was gut. 300frames is short or long? When I tracked 1700frames (HDTV) software error - is better divide this sequence to two shorter mayby in virtualdub?

4) exist some rules how corect images (Image Preparation Setup) - Saturation, Hue, Distortion, ........... etc.

[eoffermann]

Your easiest, best solves will come from footage with good data available for tracking: adequate trackable detail that remains onscreen and unobstructed and with good parallax represented.

1. Bigger is better up to a point. HD is much easier to track than SD (when shooting the same scene, you have more detail available for tracking), film a little easier than HD under similar conditions: but then there's a catch... If the plates were scanned at 4k or more, you're VERY unlikely to need that sort of detail and resizing them (to 50% or even 25% for very high res) will make the process much easier. SynthEyes works best when it can cache the material into memory, something which totally isn't going to happen with 4, 6 or 8k plates.

2. Stay FAR away from anything like Xvid, VP6 or anything like that. You're looking for as little compression as possible. Compression introduces artifacts which obscure legitimate trackable details. TGA files, TIFF or CIN files, or Quicktime Animation codec, Motion JPEG with 100% quality, this sort of thing. Your files will be BIG, but SynthEyes will have much better data to work with.

3. This is a hard question to answer. Probably 90% of the shots I end up tracking are 2-5 seconds long. Watch a television show or a movie and notice how often they change shots. LONG tracking shots are harder to get to look dead on - but for these shots, 300 frames wouldn't be too unusual. 1700 frames (at 30fps) would be an awfully long shot in a feature film and is longer than most commercials which are rarely a single, continuous shot.

4. Preparing images is something you learn as time goes by... You should be doing a few things to enhance what detail is there, if necessary, but that will vary considerably from shot to shot.