H.264, HEVC, VC-1, VP8 are video codec while AAC, AC3, MP3, FLAC are audio codecs. Let us briefly understand and clear the confusion 🙂Ĭodec : A codec is the name that the video or audio is stored in or simply put the protocol for compressing the audio and video data. A widely misunderstood and often interchangeably used term is codec and container. And finally the encoded packets are passed to the muxer to write them in defined container as the output file. The frames are then passed to the encoder which encodes them to desired form. The decoder generates uncompressed frames (raw video, PCM audio) which are processed further by filtering.

Under the HOOD – A typical FFmpeg command execution involves passing the encoded packets to the decoder. FFmpeg is available across most platforms including Linux, Mac and Windows.Check here to compile and setup FFmpeg under windows and here for mac. FFmpeg uses a flow sequence on input file to demux, decode, encode and finally mux to generate requested outcome. It provides capability to record, transform and convert audio and video content in numerous forms and formats using easy to use commands. In regards to the LFE, I think the client would handle this if they have an AC3 capable player and if not the server will force the AAC instead.įfmpeg.exe -i video.mkv -vf zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0,zscale=t=bt709:m=bt709:r=tv,format=yuv420p -c:a ac3 -c:a aac -ac 2 -c:v libx265 -crf 18 -preset slower output.mp4įfmpeg.exe -i video.mkv -vf zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0,zscale=t=bt709:m=bt709:r=tv,format=yuv420p -c:a ac3 - c:a aac -ac 2 -c:v libx265 -crf 18 -preset slower output.FFmpeg is an extremely powerful and flexible multimedia platform with extensive support to manage and process audio and video files. The source is most likely TrueHD/Atmos (that is what I think all my UHDs are so far). Of course, if you've got the right speaker setup, this is probably a completely moot point, but it is something to consider if not.

Most of the time when I process my (4K or not) Blu-ray rips for watching on my desktop, I use eac3to to downmix and mix the LFE channel into the stereo signal (then encode the result to Opus and remux with the original video stream) so that when watching it back with mpv it doesn't cause nasty clipping when I try to use any volume boosting.

I don't know if/how well FFmpeg can handle LFE mixing.

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