The following present the same data in graphs. Therefore, check for yourself the above result file sizes and the conversion times, then pick a preset level you feel comfortable. Valid presets are ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow and placebo.īecause that the visual quality are the same, so there is no need to go for the slower options, because you won’t be gaining anything but for the final file size. if you choose ultrafast, the encoding process is going to run fast, but the file size will be larger when compared to medium. The ffmpeg x265 preset determines how fast the encoding process will be. Here is another set of results, sizes and the conversion time (in minutes): 171019470 testf.avi I.e., if preset is not used, the default is medium. Here are the final sizes and the conversion time (in seconds): 2916841 testf.mp4 Which will invoke ffmpeg -i testf.mp4 -c:a libopus -b:a 64k -c:v libx265 -x265-params crf=28 -y testf_medium_.mkv -preset medium To use preset, do the following or set it in env var FFCVT_O cm=mediumįfcvt -f testf.mp4 -debug 1 -force -suf $cm -preset $cm The ffcvt -f testf.mp4 -debug 1 -force will invoke ffmpeg -i testf.mp4 -c:a libopus -b:a 64k -c:v libx265 -x265-params crf=28 -y testf_.mkv
There is a quick usage help that comes with ffcvt, produced when it is invoked without any parameters.
Moreover, to encode a directory full of video files, including under its sub-directories, you need just to give ffcvt one single parameter, the directory location, and ffcvt will go ahead and encode all video files under that directory, including all its sub-directories as well. There is a huge list of environment variables which will allow you tweak the encoding methods and parameters to exactly what you prefer instead. However, beneath the simple surface, ffcvt is versatile and powerful enough to allow you to touch every corner of audio/video encoding. The ffcvt is designed to take the burden from normal Joe - All you need to do to encode a video is to give one parameter to ffcvt, i.e., the path and file name of the video to be encoded, and ffcvt will take care of the rest, using the recommended values for both audio/video encoding to properly encode it for you. 
Such fantastic high efficiency audio/video codec/encoding capability has long been available in ffmpeg, but fewer people know it or use it, partly because the ffmpeg command line is not that simple for every one. Meanwhile the Opus audio codec is becoming the best thing ever for compressing audio - A 64K Opus audio stream is comparable to mp3 files of 128K to 256K bandwidth. The next-generation High Efficiency Video codec (HEVC), H.265 can produce videos visually comparable to libx264’s result, but in about half the file size. Debut blog for ffcvt, the ffmpeg wrapper to convert audio/video files.
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