Sync end = width + front porch (h) + hsync

can be used to force custom resolutions slightly smaller than screen without putzing with display timingįrame rate = PixelClock / ( Htotal * Vtotal ) if enabled and nonzero overscan shrinks the available framebuffer, it is the former Overscan - black pixels/lines on the sides usually eats into the active area, or maaaaay be taken out of the porches the total lines MUST be odd for interlaced modes there is a vertical porch-synch-porch in the middle of the frame, and one extra scanline to shift the half-image introduces various artefacts, lower-quality than progressive scan half the lines for the same vertical frequency (at half the frame rate) that's critical to flicker, half the data, half the bandwidth Interlacing - 'i', each frame consists of two halves, showing odd and then even lines Progressive scan - 'p', each frame is drawn separately in one go positive, '+', for rising edge-falling edge (less common) Sync polarity - negative, '-', for falling edge-rising edge (timing on falling edge) calibration signals, teletext, copy-restriction, and other data commonly in the invisible lines in back porchįront porch, back porch - period before and after sync pulse Vertical blanking interval (VBI) - number of front-porch lines + hsync pulse length + back-porch lines in lines timescale in us Horizontal blanking interval (HBI) - front porch interval + hsync pulse length + back porch interval in pixels timescale in ns Total lines - Vtotal - visible lines + vertical blanking interval Total pixels - Htotal - visible part of the line + horizontal blanking interval Total area - the active area plus invisible components in the blanking intervals duration of an interval equals number of pixels divided by frequencyĪctive area - commonly understood as the resolution the rectangular set of pixels that are visibleĪctive pixels - the visible part of the lineĪctive lines - the lines of the visible image Pixel clock - the heart of display timing, elementary timing unit everything else counts in the pixel clock ticks Vertical lines for aspect ratio signaling (VESA/CVT)ĭescription of the signals to be done later.

Ffmpeg scale vga video to 720p