Phase Alternating Line — European video standard, 25 fps, 625 lines. Obsolete for production but omnipresent in archives and legacy material. Convert to 24p for theatrical release.
Anyone working with archival material or old European recordings will inevitably encounter PAL. For decades, the system was the standard for television and video in Europe, Australia, and large parts of Asia—and it continues to leave its mark on projects that require digitizing or restoring historical footage.
PAL runs at 25 frames per second with a resolution of 625 lines (576 of which are active). The system was a technical response to NTSC but functions with an intelligent phase alternation strategy—hence the name Phase Alternating Line. The color information is encoded in such a way that transmission errors self-correct. This was a real advantage for analog television, but today it only plays a role when dealing with old material.
On set or in editing, you'll primarily notice PAL when you have to convert legacy footage. The classic problem: PAL runs at 25p, while modern cinema works at 24p. A simple speed change results in a frame drop of about 4 percent—the video becomes noticeably faster, and the pitch of the audio increases. Professionals approach this differently. They perform pulldown on the material: 25p PAL is resynced to 24p, either through frame interpolation (calculating new frames) or through clever frame blending. Some colorists also work in reverse: 24p recordings are upscaled for PAL archiving.
In practice, this means you should always ask about the original frame rate and timecode information when digitizing. A PAL tape with incorrect declarations can mess up your entire edit later. If you're working with VHS, DigiBeta, or old DV tapes from Europe—all of which ran PAL—it's worth investing in a clean capture with correct pulldown. Most modern NLEs can automatically detect and convert this, but you should always verify it.
Technically interesting is also the aspect ratio issue: PAL sources are often shot in 4:3, sometimes anamorphic 16:9. This must be considered during the transfer, otherwise, you'll end up with distorted images. Black bars or pillarboxing are then not aesthetic choices but necessities—or you deliberately reframe.