I will want to control the size of the video so that when I join them they are the same dimensions, I can do that in a single command. This will create a video called ‘promo-image.mp4’ with a duration of 5 seconds. Remember when you type it in, all lines will be on a single line. I can create a 5 second video from a png as follows: I could create a video for that, but to make it easier to change I’m going to use a single image that displays for a few seconds. Ideally I want a post roll video which links to my site.
#Android ffmpeg image to video how to#
I now know how to create videos for various sites. Previous posts have covered ffmpeg for helping with video marketing. Like I said, the filter is not very intuitive, so if you need further help writing your filtergraph, ask another question or follow the links I've already given.Having created a video, I want a call to action image that plays after the video is complete, and I want this to be standardised for a lot of my videos.
You would either send these to additional filters, or map them to the output ( -map "" -map ""). concat=n=3:v=1:a=1 tells how many files the filter should expect ( n=3) and how many video and audio streams to output ( v=1:a=1). The items like are calling the inputs, specifying which input and what stream. A video file can specify an inpoint with -ss before the -t, and will take 0 seconds as the default if not specified. loop 1 lets ffmpeg treat the images like looping video, so you don't have an inpoint. The above demuxer solution in the filter form looks like this (line breaks added for readability): ffmpeg -loop 1 -t 5 -i img_001.jpgīasically, you name all the inputs at the beginning of the command.
#Android ffmpeg image to video full#
It's not as intuitive, but you have full control and won't need a text file. If you want to concatenate files of different types, you will have to use the concat filter. I've never tried this method with different image types, but I assume something like a mix of jpeg and png inputs would throw an error. This means basically everything like framerate and codec must be the same, but the container can be different. The concat demuxer requires all input files to have the same streams. However, when the input file is an image (instead of a video) the inpoint creates an error, so you have to leave it out. The inpoint is where in the video input timeline you want to start, and the outpoint is for how many seconds you want to go. In the text file, the format is usually like what is found in this similar question/answer, where you specify an "inpoint" as well as an "outpoint". This is not necessary if they are relative paths.ĭifferences when working with video files instead of images: You can put full file paths with the file name, but will also have to include -safe 0 after concat for it to work.You can give partial seconds with a decimal.The framerate will be whatever you specify under (the correct flag here would be -r) or default to 30 fps (I think) if you do not specify anything.If just the three files in the example are run, you will get a 17 second video that shows 3 images the first for 5 seconds, the second for 3 seconds, and the third for 9 seconds.The text file lists the file name, then lists the amount of time to show it in seconds.The command uses -f concat demuxer to add all the files listed in the text file to a single output.
Then you run the following command: ffmpeg -f concat -i output.mp4 To get each image to have a different time shown, instead of all images having the same time, you'll have to use the concat demuxer and a text file.Ĭreate a text file like the following, ordering the images as you'd want them.
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