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diff --git a/DOCS/encoding.rst b/DOCS/encoding.rst new file mode 100644 index 0000000..9c6c067 --- /dev/null +++ b/DOCS/encoding.rst @@ -0,0 +1,155 @@ +General usage +============= + +:: + + mpv infile --o=outfile [--of=outfileformat] [--ofopts=formatoptions] [--orawts] \ + [(any other mpv options)] \ + --ovc=outvideocodec [--ovcopts=outvideocodecoptions] \ + --oac=outaudiocodec [--oacopts=outaudiocodecoptions] + +Help for these options is provided if giving help as parameter, as in:: + + mpv --ovc=help + +The suboptions of these generally are identical to ffmpeg's (as option parsing +is simply delegated to ffmpeg). The option --ocopyts enables copying timestamps +from the source as-is, instead of fixing them to match audio playback time +(note: this doesn't work with all output container formats); --orawts even turns +off discontinuity fixing. + +Note that if neither --ofps nor --oautofps is specified, VFR encoding is assumed +and the time base is 24000fps. --oautofps sets --ofps to a guessed fps number +from the input video. Note that not all codecs and not all formats support VFR +encoding, and some which do have bugs when a target bitrate is specified - use +--ofps or --oautofps to force CFR encoding in these cases. + +Of course, the options can be stored in a profile, like this .config/mpv/mpv.conf +section:: + + [myencprofile] + vf-add = scale=480:-2 + ovc = libx264 + ovcopts-add = preset=medium + ovcopts-add = tune=fastdecode + ovcopts-add = crf=23 + ovcopts-add = maxrate=1500k + ovcopts-add = bufsize=1000k + ovcopts-add = rc_init_occupancy=900k + ovcopts-add = refs=2 + ovcopts-add = profile=baseline + oac = aac + oacopts-add = b=96k + +It's also possible to define default encoding options by putting them into +the section named ``[encoding]``. (This behavior changed after mpv 0.3.x. In +mpv 0.3.x, config options in the default section / no section were applied +to encoding. This is not the case anymore.) + +One can then encode using this profile using the command:: + + mpv infile --o=outfile.mp4 --profile=myencprofile + +Some example profiles are provided in a file +etc/encoding-profiles.conf; as for this, see below. + + +Encoding examples +================= + +These are some examples of encoding targets this code has been used and tested +for. + +Typical MPEG-4 Part 2 ("ASP", "DivX") encoding, AVI container:: + + mpv infile --o=outfile.avi \ + --vf=fps=25 \ + --ovc=mpeg4 --ovcopts=qscale=4 \ + --oac=libmp3lame --oacopts=b=128k + +Note: AVI does not support variable frame rate, so the fps filter must be used. +The frame rate should ideally match the input (25 for PAL, 24000/1001 or +30000/1001 for NTSC) + +Typical MPEG-4 Part 10 ("AVC", "H.264") encoding, Matroska (MKV) container:: + + mpv infile --o=outfile.mkv \ + --ovc=libx264 --ovcopts=preset=medium,crf=23,profile=baseline \ + --oac=libopus --oacopts=qscale=3 + +Typical MPEG-4 Part 10 ("AVC", "H.264") encoding, MPEG-4 (MP4) container:: + + mpv infile --o=outfile.mp4 \ + --ovc=libx264 --ovcopts=preset=medium,crf=23,profile=baseline \ + --oac=aac --oacopts=b=128k + +Typical VP8 encoding, WebM (restricted Matroska) container:: + + mpv infile -o outfile.mkv \ + --of=webm \ + --ovc=libvpx --ovcopts=qmin=6,b=1000000k \ + --oac=libopus --oacopts=qscale=3 + + +Device targets +============== + +As the options for various devices can get complex, profiles can be used. + +An example profile file for encoding is provided in +etc/encoding-profiles.conf in the source tree. This file is installed and loaded +by default. If you want to modify it, you can replace and it with your own copy +by doing:: + + mkdir -p ~/.mpv + cp /etc/mpv/encoding-profiles.conf ~/.mpv/encoding-profiles.conf + +Keep in mind that the default profile is the playback one. If you want to add +options that apply only in encoding mode, put them into a ``[encoding]`` +section. + +Refer to the top of that file for more comments - in a nutshell, the following +options are added by it:: + + --profile=enc-to-dvdpal # DVD-Video PAL, use dvdauthor -v pal+4:3 -a ac3+en + --profile=enc-to-dvdntsc # DVD-Video NTSC, use dvdauthor -v ntsc+4:3 -a ac3+en + --profile=enc-to-bb-9000 # MP4 for Blackberry Bold 9000 + --profile=enc-to-nok-6300 # 3GP for Nokia 6300 + --profile=enc-to-psp # MP4 for PlayStation Portable + --profile=enc-to-iphone # MP4 for iPhone + --profile=enc-to-iphone-4 # MP4 for iPhone 4 (double res) + --profile=enc-to-iphone-5 # MP4 for iPhone 5 (even larger res) + +You can encode using these with a command line like:: + + mpv infile --o=outfile.mp4 --profile=enc-to-bb-9000 + +Of course, you are free to override options set by these profiles by specifying +them after the -profile option. + + +What works +========== + +* Encoding at variable frame rate (default) +* Encoding at constant frame rate using --vf=fps=RATE +* 2-pass encoding (specify flags=+pass1 in the first pass's --ovcopts, specify + flags=+pass2 in the second pass) +* Hardcoding subtitles using vobsub, ass or srt subtitle rendering (just + configure mpv for the subtitles as usual) +* Hardcoding any other mpv OSD (e.g. time codes, using --osdlevel=3 and + --vf=expand=::::1) +* Encoding directly from a DVD, network stream, webcam, or any other source + mpv supports +* Using x264 presets/tunings/profiles (by using profile=, tune=, preset= in the + --ovcopts) +* Deinterlacing/Inverse Telecine with any of mpv's filters for that +* Audio file converting: mpv --o=outfile.m4a infile.flac --no-video + --oac=aac --oacopts=b=320k + +What does not work yet +====================== + +* 3-pass encoding (ensuring constant total size and bitrate constraints while + having VBR audio; mencoder calls this "frameno") +* Direct stream copy |