- Digital Picture Exchange
- Using ffmpeg in a VFX pipeline
- FFMPEG An Intermediate Guide/image sequence
- DPX preservation workflow with RAWcooked and fixity checking
Using ffmpeg in a VFX pipeline
FFMPEG has a powerful set of features relating to creating video from images, or generating an image sequence from a video. When no further arguments are given a set of defaults will be used. For example the framerate will be 25 and the encoding will be inferred from the filenames. This particular pattern corresponds to image There is more to know about filename patterns which will explained in a later section. The canonical form to work with image sequences is to use the -f image2 argument like this:. But ffmpeg is very good with inferring that information so this chapter will omit that argument in all examples unless absolutely necessary. This will create a video with the filename video. The encoding of the images and of the video is inferred from the extensions. The framerate is 25 fps by default. The video width and height is taken from the images. The images have to be all of the same dimension. Ffmpeg expects the numbering to start at 0 or in this example. Then ffmpeg will only process the first three and ignore the last file. If you have missing numbers you can use a glob pattern or rename all the remaining files to close the gap. The default framerate is 25 fps. This is a speed which creates the illusion of a smooth animation for most humans eyes. If you still want more frames per second then use the -framerate argument:. If you want to have a slideshow then you have to lower the input framerate. The following command will show each image 5 seconds long:. You can make a slideshow with different duration for each picture, by using the zoompan filter. You can make a slideshow with crossfading between the pictures, by using a combination of the zoompan and framerate filters. This will extract 25 images per second from the file video. 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.
FFMPEG An Intermediate Guide/image sequence
DPX preservation workflow with RAWcooked and fixity checking
FFmpeg can be hooked up with a number of external libraries to add support for more formats. None of them are used by default, their use has to be explicitly requested by passing the appropriate flags to. Then pass --enable-libaom to configure to enable it. To enable support you must obtain the AMF framework header files version 1. Then configure FFmpeg with --enable-amf. Initialization of amf encoder occurs in this order: 1 trying to initialize through dx11 only windows 2 trying to initialize through dx9 only windows 3 trying to initialize through vulkan. To use h. FFmpeg can read AviSynth scripts as input. Distributors can build FFmpeg with --enable-avisynthand the binaries will work regardless of the end user having AviSynth installed. FFmpeg can make use of the Chromaprint library for generating audio fingerprints. Pass --enable-chromaprint to configure to enable it. FFmpeg can make use of the codec2 library for codec2 decoding and encoding. There is currently no native decoder, so libcodec2 must be used for decoding. Build and install using CMake. Debian users can install the libcodec2-dev package instead. Once libcodec2 is installed you can pass --enable-libcodec2 to configure to enable it. The easiest way to use codec2 is with. To encode such a file, use a. Playback is as simple as ffplay output. Raw codec2 files are also supported. To make sense of them the mode in use needs to be specified as a format option: ffmpeg -f codec2raw -mode -i input. Then pass --enable-libdav1d to configure to enable it. Then pass --enable-libdavs2 to configure to enable it. FFmpeg can make use of the Game Music Emu library to read audio from supported video game music file formats. Pass --enable-libgme to configure to enable it. To use QSV, FFmpeg must be linked against the libmfx dispatcher, which loads the actual decoding libraries. Then pass --enable-libkvazaar to configure to enable it. Then pass --enable-libmp3lame to configure to enable it. FFmpeg can make use of the libilbc library for iLBC decoding and encoding. Then pass --enable-libilbc to configure to enable it. Then pass --enable-libvpx to configure to enable it. Pass --enable-libmodplug to configure to enable it. Therefore, for GPL builds, you have to pass --enable-nonfree to configure in order to use it. To the best of our knowledge, it is compatible with the LGPL. Then pass --enable-libvo-amrwbenc to configure to enable it. Then pass --enable-libfdk-aac to configure to enable it. Then pass --enable-libopenh to configure to enable it. To enable using rav1e in FFmpeg, pass --enable-librav1e to.