You can use a bash "for loop" to encode all videos in a directory: mkdir encodedįor f in *.avi do. It supports more formats not it is not as widely supported by players and devices as MP4 for example. The Matroska output container will be used. The audio will be stream copied from the input to the output. Generally you use the slowest preset that you have patience for.įor a set of videos use the same -crf and -preset for all of them. These are: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow. Video encoding speed/compression efficiency for this encoder is controlled with the -preset. Generally you use the highest value that still gives you an acceptable quality. 0 is lossless (files will likely be huge), 18 is often considered to be "visually lossless", 23 is default, and 51 is worst quality. The encoder libx264 will produce H.264 video. ffmpeg will then automatically calculate the correct value while maintaining the aspect ratio. With scale you can just declare one dimension, height in this case, and use -1 in the other. crf 20 selects a CRF value of 20 which will result in a high quality output. Use the slowest preset that you have patience for. preset slow selects the slow x264 encoding preset. Encode ffmpeg -i in.avi -vf scale=-1:720 -c:v libx264 -crf 18 -preset fast -c:a copy out.mkv c:v libx264 selects the video encoder libx264, which is a H.264 encoder. If you can copy and paste you can compile ffmpeg.Ģ. Just follow a step-by-step guide: How to Compile FFmpeg on Ubuntu. When compiling you control exactly how ffmpeg is configured and also allows you to use certain encoders, such as libfdk_aac, that are not available in the static builds. Tar xzvf ffmpeg.static.32bit.$(date +"%F").tar.gz All you do is download, extract, and run it (note the. a video of the given width and - height, forcing the choice of the h264 encoder. This is simply a binary that someone else compiled. FFmpeg.Encode where import import Codec.FFmpeg. There are two main methods to get ffmpeg and neither will interfere with packages from the repository including the so-called "ffmpeg" package: Using a static build Development is very active and using a recent build will allow you to avoid fixed bugs while giving you access to the latest features. I believe you have libx264 installed and configured with ffmpeg to convert video to h264 Then you can try with -vcodec libx264 The -format option is for. It is always a good idea to use a recent build when encoding with ffmpeg.
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