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• FFMPEG - What are some recommended parameters for x265 (libx265) ?

  7 janvier 2019, par dd_code

  I am working on re-encoding some footage (x264), including some grainy footage. I am interested in CRF-only bitrate management (I want to avoid artifacts during demanding scenes).
  What are recommended parameters to be set instead of leaving them at their defaults ?

  Here is what I got so far, pretty simple :

  ffmpeg -i in.mkv -vf unsharp=3:3:1 -c:v libx265 -tune:v grain -crf 24 -c:a copy out.mkv

  (this example has grain tune as many files are grainy, and without it it washes it out and all the "detail by noise" is lost + I am applying a light sharpening filter, I find there is always a room to sharpen a bit without causing noticeable sharpening artifacts)

  If I am not mistaken all the params one does consider are ones contained in the presets, but is there some other or one of those which is a good practice to adjust manually to achieve a better result ? I was wondering specifically about P,I,B-frames and AQ (but I guess there are some other as well).

• How to force "full range" flag on export

  28 janvier 2019, par Emanuele Vissani

  I have an ffmpeg command to remap audio tracks to descrete channels in a ProRes 4444 quicktime file. Even if the input video is copied to the output, the exported file is interpreted by a professional video player software as video range (16-234 values) instead of the original full range (0-255 values), making it look more contrasted.
  The content is actually correct, changing manually the range setting in the player software gives back the right light range, so I think the output file just lose some kind of range flag.

  I already tried the following options without results :

  -colorspace bt709 -movflags +write_colr

  -dst_range 1 -color_range 2

  -vf scale=out_range=full

  -vf scale=in_range=full:out_range=full

  Original command is :

  ffmpeg -i F:\_IMPORT\TST_ProRes4444_4k.mov -map 0:0 -c copy -map 0:1 -c copy -map_channel 0.2.0:0.2 -c:a pcm_s24le F:\_EXPORT\TEST\test.mov

  Thank you for your help.

• How to compile ffmpeg to get only mp3 and mp4 support

  19 février 2019, par Enis Jasarovic

  I’m building Electron app and I use ffmpeg to convert m4a or webm files to mp3, and also to merge video only mp4 with m4a audio file to mp4.

  I am able to achieve this using [media-autobuild-suite] (https://github.com/jb-alvarado/media-autobuild_suite), using light build option, but the size of static files is arround 20mb and I’would like to shrink it a little bit more. I’ve compiled ffmpeg and ffprobe with this configuration.

  --disable-libaom
  
  --disable-version3
  
  # Full
  
  --disable-chromaprint
  
  --disable-cuda-sdk
  
  --disable-decklink
  
  --disable-frei0r
  
  --disable-libbs2b
  
  --disable-libcaca
  
  --disable-libcdio
  
  --disable-libfdk-aac
  
  --disable-libflite
  
  --disable-libfribidi
  
  --disable-libgme
  
  --disable-libgsm
  
  --disable-libilbc
  
  --disable-libkvazaar
  
  --disable-libmodplug
  
  --disable-libnpp
  
  --disable-libopenh264
  
  --disable-libopenmpt
  
  --disable-librtmp
  
  --disable-librubberband
  
  --disable-libssh
  
  --disable-libtesseract
  
  --disable-libxavs
  
  --disable-libzmq
  
  --disable-libzvbi
  
  --disable-opencl
  
  --disable-opengl
  
  --disable-libvmaf
  
  --disable-libcodec2
  
  --disable-libsrt
  
  --disable-ladspa
  
  --disable-ffplay
  
  #--enable-vapoursynth
  
  #--enable-liblensfun
  
  --disable-libndi_newtek
  
  
  
  --enable-demuxer=mp3
  
  --enable-demuxer=mov
  
  --enable-demuxer=opus
  
  
  
  --enable-parser=ac3
  
  --enable-parser=mpegaudio
  
  --enable-parser=h264
  
  --enable-parser=opus
  
  
  
  --enable-protocol=file
  
  --enable-protocol=pipe
  
  
  
  --enable-decoder=mp3
  
  --enable-decoder=mp4
  
  --enable-decoder=opus
  
  
  
  --enable-encoder=mp3
  
  --enable-encoder=mp4
  
  --enable-encoder=opus

  With this configuration I’m getting ffmpeg static file arround 2mb and ffprobe static file arround 2mb but with this error.

  C:\Users\Admin\Desktop\ffmpeg compilations\2mb\local64>ffmpeg -i simple.m4a simple.mp3 
  
  ffmpeg version N-93147-g9326117bf6 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8.2.1 (Rev1, Built by MSYS2 project) 20181214
  
  configuration:  .... //here comes configuration as described above
  
  libavutil      56. 26.100 / 56. 26.100
  
  libavcodec     58. 47.102 / 58. 47.102
  
  libavformat    58. 26.101 / 58. 26.101
  
  libavdevice    58.  6.101 / 58.  6.101
  
  libavfilter     7. 48.100 /  7. 48.100
  
  libswscale      5.  4.100 /  5.  4.100
  
  libswresample   3.  4.100 /  3.  4.100
  
  libpostproc    55.  4.100 / 55.  4.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'simple.m4a':
  
  Metadata:
  
    major_brand     : dash
  
    minor_version   : 0
  
    compatible_brands: iso6mp41
  
    creation_time   : 2018-10-31T19:47:32.000000Z
  
  Duration: 00:02:38.92, start: 0.000000, bitrate: 127 kb/s
  
  Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, 7 kb/s (default)
  
  Metadata:
  
    creation_time   : 2018-10-31T19:47:32.000000Z
  
    handler_name    : SoundHandler
  
  [NULL @ 0000000000486200] Unable to find a suitable output format for 'simple.mp3' 
  
  simple.mp3: Invalid argument

  Any ideas what else should I include into this static file ?