If there are more than frames then the last image will be overwritten with the remaining frames leaving only the last frame. The images width and height is taken from the video. Usually ffmpeg has one input file and one output file, but when we want to create a video from a set of image then we have a set of input files. Likewise, when extracting images from a video file there is a set of output files.
A filename pattern is a pseudo filename to describe a set of filenames. Technically there is a fourth form: the single image form. But that is a trivial special case and will not be discussed further in this section.
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In words: the string image- followed by three digits followed by the string. The notation is so complex because it is designed to accommodate many different use cases. The ffmpeg developers borrowed the notation and stripped it down to just one use case: how many digits. That is why it may seem unnecessarily complex.
The technical jargon for this is to "escape" the character. If the filenames are not numbered using digits or are otherwise not formated regularly then one can use the glob pattern. Note that this is not supported on Windows. Wikipedia has related information at glob programming.
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There are more glob patterns. For example?
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But we will not go in to more details here. The interessted reader can read more in depth information in the wikipedia page about glob programming. It is necessary to place the glob pattern in quotes otherwise the shell will expand the glob before executing the command. Note that this command has a different meaning because now image-bar.
Numbered files have a clearly defined ordering. For the most part humans and computers alike agree how to sort the numbers. This is especially true for numbers with leading zeroes. Without leading zeroes things get a bit more complicated. Most computers will sort 15 after When the files are no longer numbered or not regularly then things can get very strange.
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For example should ae sort before or after aaa? Computers are deterministic and always have an idea of how to sort things, but that idea of order does not necessarily makes sense for a human. The order of the files from a glob pattern is determined by the glob system call.
But this book will not discuss that. For small number of files the order returned by a glob can be inspected by letting a shell expand the glob. We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed. Listen now. Home Questions Tags Users Unanswered.
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Is there an app that will convert a movie to an image sequence? Ask Question. Asked 7 years, 8 months ago. Active 1 year, 7 months ago. Viewed 18k times. Nils Munch Nils Munch 1 1 gold badge 4 4 silver badges 11 11 bronze badges.
Yeah, no problem! That's what Ask Different exists for. It seems this functionality is no longer offered in the non-pro version of QuickTime? For those still looking for an app, I created one such app because QuickTime took away the functionality.
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If interested, you can download it from here: download. You can also use ffmpeg: ffmpeg -i input. Pieter-Jan 3 3 bronze badges. Lri Lri After hunting around for quite a while for an app that could do this, this was exactly what I needed. Open source software FTW.