1

Here are few screencaps from different sources:

  • Bleach 170:

    Bleach 170

  • Bleach 297, where 16:9 episode actually used 4:3 material in one reminiscence scene (they even animated the black bars) - poor source material?

    Bleach 297

  • Xena the Warrior Princess:

    Xena

  • Finally a Youtube video:

If you look closely, each of these frames contains a thin black line near the bottom, or in the case of the Youtube video, near the top. The line spans about 60% of the video width. What is it and why is it there? Is it used for some kind of calibration?

2

The first anime pic is throwing me off, but it seems to be an artifact of how interlaced analog signals were structured and displayed.

For analog NTSC there is a total of 525 scanning lines of which originally 483 lines were visible (241.5 visible lines + 21 lines of vertical blanking per field)

Update: this answer at the electronics site gives the full picture.

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