Обрезка краёв видео в программе Mencoder
crop area: X: 0..479 Y: 104..373 (-vf crop=480:270:0:104) 0.9% 0 0 87%
crop area: X: 0..479 Y: 104..373 (-vf crop=480:270:0:104) 0.9% 0 0 86%
crop area: X: 0..479 Y: 104..373 (-vf crop=480:270:0:104) 1.0% 0 0 86%
Нас интересует вот эта часть: ----------> ^^^^^^^^^^^^^^^^^^
Первые два числа (480 и 270) это ширина/высота кадра. Они должны быть кратны 16 для лучшего качества. Если они не кратны (270) то их нужно уменьшить до ближайшего кратного 16-ти числа (270->256). Вторые два числа (0 и 104) это отступы слева и сверху. Они должны быть чётными для лучшего качества. Если ширина или высота были уменьшены до кратного 16-ти числа, то желательно скорректировать и отступы, чтобы не сдвинуть центр кадра. (В этом примере высота была уменьшена на 270-256=14, соотвественно для сохранения центра нужно увеличить второй отсуп на 14/2=7, т.е. установить его в 104+7=111, но поскольку отступ должен быть чётным то мы его уменьшим на 1, т.е. 110.) Определить crop (-frames нужен чтобы выйти из mplayer через несколько секунд):
mplayer $src -vf cropdetect -frames 100
Crop (получен из предыдущего запуска mplayer и ручных расчётов):
crop="480:256:0:106"
Проверить что mplayer корректно определил crop:
mplayer $src -vf crop="480:256:0:106"
Ссылки
Собственный видеохостинг
Руководство пользователя VLC
http://gwos.org/udsf/doku.php/software:ffmepg:conversion
http://www.xakep.ru/magazine/xa/093/126/1.asp
Encode DVD to AVI
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