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• How to (visually) losslessly compress a video with GPU acceleration in ffmpeg ?

  4 juin 2022, par Tizian Heckmann

  I am trying to compress a video in ffmpeg with GPU acceleration, but the result always looks bad. This is what I have tried and none of this has worked for me :

  


  Preset 18 is called "best quality" when looking at ffmpeg -h encoder=hevc_nvenc
  
ffmpeg -i input.mp4 -c:v hevc_nvenc -preset 18 compressed.mp4

  


  Also :
  
ffmpeg -i input.mp4 -c:v h264_nvenc -preset 18 compressed.mp4

  


  Unfortunately, the preset lossless is deprecated. When trying
  
ffmpeg -i input.mp4 -c:v h264_nvenc -preset lossless compressed.mp4
  
the output file just grows enormous.

  


  Any help is appreciated.
  
Edit : Since my question is being received as inappropriate by the community, I would like to know why. This was my first question, any advice on how to word it better or tell me why it just does not fit here would be appreciated. Thank you.

  


• How to bold a font in ffmpeg ?

  28 février 2023, par Peter.k

  I have an issue which I don't fully understand. I use font to merge subtitles in video which is installed in my laptop and everything works fine with this code :

  


  -vf "subtitles=tt101.srt:force_style='FontName=Lucida Console,Style=Bold,FontSize=15,PrimaryColour=&H00111188,OutlineColour=&HFFFFFFFF,BorderStyle=4,BackColour=&H44FFFFFF,Outline=5,Shadow=0,MarginV=10'"


  


  But later I found this font isn't really bold but regular. I checked in my system and indeed, there's no bold version installed, so this Style=Bold fragment is ignored (as I think it is). But how the hell, while using this very font in some other programs like Word, Excel, Photoshop, PotPlayer, etc, I am able to bold this font anyway ? Why ffmpeg doesn't make it ? Does these programs use something else than Windows show in the Font catalog ?

  


• SOLVED - FFMPEG 'Fontconfig error : Cannot load default config file' error Windows

  27 février 2019, par Merel

  I am trying to make a short video in FFMPEG, where a word stays on screen for the duration of the video (0.5s). My FFMPEG code looks like this :

  ffmpeg -f lavfi -i color=c=white:s=320x240:d=0.5 -vf "drawtext=fontfile= ‘c\:\Windows\fonts\calibri.ttf':fontsize=18:  fontcolor=black:x=(w-text_w)/2:y=(h-text_h)/2:text='word'" output.mp4

  However, I keep getting the following error (see below for full output) :

  Fontconfig error: Cannot load default config file 
  
  [Parsed_drawtext_0 @ 000001c2918cef00] Using "C:/Windows/fonts/mingliub.ttc"

  I figured it had something to do with the path to the font file. I also tried copying the font file to my FFMPEG map and map the font path to the FFMPEG directory :

  ffmpeg -f lavfi -i color=c=white:s=320x240:d=0.5 -vf
  
  "drawtext=fontfile=‘C:\FFMPEG\bin\calibri.ttf':fontsize=18: 
  
  fontcolor=black:x=(w-text_w)/2:y=(h-text_h)/2:text='word'" output.mp4'

  This doesn’t work either. I do get an output video.mp4 video, but the font is wrong. Here is the full output I get. It is the same for both code examples above :

   c:\FFMPEG\bin>ffmpeg -f lavfi -i color=c=white:s=320x240:d=0.5 -vf "drawtext=fontfile= ‘c\\:\\\Windows\\\fonts\\\calibri.ttf':fontsize=18:  fontcolor=black:x=(w-text_w)/2:y=(h-text_h)/2:text='word'" output.mp4
  
  ffmpeg version N-93234-g2e67f751b5 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20190212
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    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
  
  Input #0, lavfi, from 'color=c=white:s=320x240:d=0.5':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  Fontconfig error: Cannot load default config file
  
  [Parsed_drawtext_0 @ 00000291ad7def00] Using "C:/Windows/fonts/mingliub.ttc"
  
  [libx264 @ 00000291af0ef180] using SAR=1/1
  
  [libx264 @ 00000291af0ef180] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 00000291af0ef180] profile High, level 1.3, 4:2:0, 8-bit
  
  [libx264 @ 00000291af0ef180] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf58.26.101
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc58.47.102 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  [Parsed_color_0 @ 00000291af0aa840] EOF timestamp not reliable
  
  frame=   13 fps=0.0 q=-1.0 Lsize=       2kB time=00:00:00.40 bitrate=  43.9kbits/s speed=4.27x
  
  video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 84.991570%
  
  [libx264 @ 00000291af0ef180] frame I:1     Avg QP: 9.22  size:   306
  
  [libx264 @ 00000291af0ef180] frame P:3     Avg QP:11.33  size:    20
  
  [libx264 @ 00000291af0ef180] frame B:9     Avg QP:12.67  size:    14
  
  [libx264 @ 00000291af0ef180] consecutive B-frames:  7.7%  0.0%  0.0% 92.3%
  
  [libx264 @ 00000291af0ef180] mb I  I16..4: 98.7%  0.0%  1.3%
  
  [libx264 @ 00000291af0ef180] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
  
  [libx264 @ 00000291af0ef180] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%
  
  [libx264 @ 00000291af0ef180] 8x8 transform intra:0.0%
  
  [libx264 @ 00000291af0ef180] coded y,uvDC,uvAC intra: 1.0% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 00000291af0ef180] i16 v,h,dc,p: 92%  1%  7%  0%
  
  [libx264 @ 00000291af0ef180] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39%  3% 42%  2%  5%  5%  2%  2%  2%
  
  [libx264 @ 00000291af0ef180] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 00000291af0ef180] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 00000291af0ef180] kb/s:7.65

  SOLVED ! Apparently the problem was that the path to the font cannot contain a semicolon (i.e., "C :/". The code that worked is :

  ffmpeg -f lavfi -i color=c=white:s=320x240:d=0.5 -vf “drawtext=fontfile= /Windows/fonts/calibri.ttf:fontsize=18: fontcolor=black:x=(w-text_w)/2:y=(h-text_h)/2:text=word” output.mp4