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• FFmpeg | subtitles with ass format

  26 octobre 2018, par Praveen Tamil

  I would like to generate subtitles with dynamic font

  [Script Info]
  
  ScriptType: v4.00+
  
  PlayResX: 1280
  
  PlayResY: 720
  
  Title: WoFox
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,30,&Hffffff,&Hffffff,&H0000FF,&H0000FF,0,0,0,0,100,100,5,0,3,1,0,3,10,10,10,1
  
  Style: Default1,/home/nodeuser8/tmp/CharmonmanRegular.ttf,40,&Hffffff,&Hffffff,&H0000FF,&H0000FF,0,0,0,0,100,100,5,0,3,1,0,3,10,10,10,1
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,00:00:00.0,00:00:03.0,Default,,0,0,0,,My first subtitle! Click this text to edit
  
  Dialogue: 0,00:00:00.0,00:00:03.0,Default1,,0,0,0,,This box shows the amount of text that fits into one caption. As you change the style of the captions, you can preview how

  And my ffmpeg code is

  ffmpeg -i ./tmp/source.mp4 -t 5 -filter_complex "ass=filename=./tmp/subtitles.ass" ./t mp/output.mp4 -y

  But I didn’t get out expected output.

  The Console is

  [Parsed_ass_0 @ 0x58680c0] Shaper: FriBidi 1.0.5 (SIMPLE)
  
  [Parsed_ass_0 @ 0x58680c0] Using font provider fontconfig
  
  [Parsed_ass_0 @ 0x58680c0] Added subtitle file: './tmp/subtitles.ass' (3 styles, 2 events)
  
  Stream mapping:
  
    Stream #0:0 (h264) -> ass (graph 0)
  
    ass (graph 0) -> Stream #0:0 (libx264)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [Parsed_ass_0 @ 0x5cd4180] Shaper: FriBidi 1.0.5 (SIMPLE)
  
  [Parsed_ass_0 @ 0x5cd4180] Using font provider fontconfig
  
  [Parsed_ass_0 @ 0x5cd4180] Added subtitle file: './tmp/subtitles.ass' (3  styles, 2 events)
  
  [Parsed_ass_0 @ 0x5cd4180] fontselect: (Arial, 400, 0) -> /usr/share/fonts/liberation/LiberationSans-Regular.ttf, 0, LiberationSans
  
  [Parsed_ass_0 @ 0x5cd4180] fontselect: (/home/nodeuser8/tmp/CharmonmanRegular.ttf, 400, 0) -> /usr/share/fonts/dejavu/DejaVuSans.ttf, 0, DejaVuSans
  
  [libx264 @ 0x5869880] using SAR=1/1
  
  [libx264 @ 0x5869880] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x5869880] profile High, level 3.1, 4:2:0, 8-bit
  
  [libx264 @ 0x5869880] 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=15 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 './tmp/output.mp4':

  Here I’m trying to load font from /home/nodeuser8/tmp/CharmonmanRegular.ttf but ffmpeg load font from /usr/share/fonts/dejavu/DejaVuSans.ttf.

  So how to load fontfile for ass subtitles ?

• ffmpeg using drawtext and select together

  9 mars 2018, par loosenut

  I’m trying to extract every 30th frame from a video and add text to it, and output as a jpg. Here’s the code I’m using :

  ffmpeg -i test.mp4 -vf "select=not(mod(n\,30)), drawtext=fontfile='C\:\\Windows\\Fonts\\arial.ttf:text='test':fontcolor=white:fontsize=45:x=(main_w/2-text_w/2):y=1800:" -vsync vfr -q:v 2 img_%03d.jpg

  The first frame selected outputs as img_batch3d.jpg, then this is the error message I get :

  [image2 @ 00000146e59d0500] Could not get frame filename number 2 from pattern 'img_batch3d.jpg' (either set update or use a pattern like %03d within the filename pattern)
  
  av_interleaved_write_frame(): Invalid argument

  Please help.

• Drawing text on video with avconv only at the start of the video

  21 juillet 2013, par Gael

  I want to embed the creation date of personnal videos, but only at their start (let say the 10 first seconds).

  I'm using the drawtext of avconv :

  avconv -i input.avi -vf
  "drawtext=fontcolor=white:fontsize=30:fontfile=/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-L.ttf:text='$date':x=30:y=h-text_h-30"
  test.mpg

  but I do not find any option to tell to just write the date on only a portion of the video. I could split the start of the video, or make an srt file, but there is probably an easier solution.