![]() ![]() Most users won't be able to detect any difference from loss-less. b:a 128k specifies 128k bitrate, which for 2-channel (above) is 64k audio. Remove this to preserve 5.1 audio steams. acodec libfdk_aac specifies Fraunhofer FDK AAC audio codec (note: this may have to be installed in your FFMpeg distribution). This may be specific to the H264 codec and must be researched for use with other codecs. A slower preset will provide better compression (compression is quality per filesize). A preset is a collection of options that will provide a certain encoding speed to compression ratio. preset veryslow very slow preset provides the highest compression and smallest file size, but at the slowest speed. crf 20 specifies a constant quality of 20, which is a very good and will not be detected as different from loss-less from most viewers. vcodec libx264 specifies the h264 video codec (note: this may have to be installed in your FFMpeg distribution). i "$FIL" specifies the input file by calling the variable for current file. A higher value will allow to detect more accurate information and reduce errors. analyzeduration 100000000 specifies how many microseconds are analyzed to probe the input. A higher value will allow to detect more information and reduce errors. the size of the data to analyze to get stream information. probesize 100000000 sets probing size in bytes, i.e. Nice -19 sets the processing priority to lowest possible. If a new output codec is desired (which it almost always would be if the search codec is changed), edit the default FFmpeg commands described directly below. ![]() ![]() From the CLI: ffmpeg -codecs is a good start to find out the correct names for codecs or consult the FFMpeg documentation. These are the if
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