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• how can I convert a stack of PNGs with transparency to a video playable with Keynote

  29 juin 2022, par John Smith

  I used to convert a stack of PNGs with alpha transparency using ffmpeg :

  


  ffmpeg -i frame_%03d.png -vcodec png output.mov


  


  I have an old mov where this worked. Now I tried to do that again a while later (on an M1 Mac now). Now it doesn't work anymore. Here are the file properties :

  


  





  


  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  property	old movie (works)	new movie (does not work)
  resolution	378 × 378	1600 × 1000
  codec	Apple ProRes 4444	PNG
  alpha channel	yes	?
  color profile	SD (6-1-6)	?
  software	Lavf57.41.100	Lavf59.16.100

  


  


  The ? shows that I cannot open the new file in Quicktime, nor import it in Keynote. Any idea how I can use ffmpeg to convert my image stack to a file with transparency that works in Keynote / Quicktime ?

  


• ffmpeg perspective filter animation error

  17 mars 2021, par eeun

  I'm trying to create a pseudo-3d pan effect in ffmpeg using the perspective filter.

  


  Here is a sample for the starting point...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=x0=200:y0=200:x1=1600:y1=0:x2=200:y2=700:x3=1600:y3=900[skew]" -an -map [skew] "skew-start.mp4"


  


  And here is a sample for the end point...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=x0=0:y0=0:x1=1600:y1=0:x2=0:y2=900:x3=1600:y3=900[skew]" -an -map [skew] "skew-end.mp4"


  


  So far so good. Adding the animation would give this...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=eval=frame:x0='200-(200*t/5)':y0='200-(200*t/5)':x1=1600:y1=0:x2='200-(200*t/5)':y2='700+(200*t/5)':x3=1600:y3=900[skew]" -an -map [skew] skew.mp4


  


  This is where the problem occurs. I get an error saying [Eval @ 000000f36ebfebf0] Undefined constant or missing '(' in 't/5)' Error while filtering: Invalid argument

  


  The perspective docs say it should work with an eval=frame option. Anyone got any ideas ? Does this look like a bug in ffmpeg ? I'm using the latest version, 4.3.2.

  


• Creating a timelapse from a directory of jpgs

  26 juillet 2020, par Casey Davis

  I'm using this code to create a timelapse from a directory of images. My directory has about 1600 jpgs in it that all start with the date in this format 2020-03-01-time.jpg, 2020-03-02-time-name.jpg, etc. Sorting alphabetically works just fine. It runs, but it seems to only get through a few hundred photos and makes a 3 second long mp4. I'm not sure what I'm doing wrong.

  


  I'm not opposed to moving to python or anything else. Eventually I'll need to pass some parameters in here and I'll attempt to automate it and ftp the output to a webserver.

  


  Here is the command :

  


  ffmpeg -r 24 -pattern_type glob -i '*.jpg' -s hd1080 -vcodec libx264 timelapse.mp4


  


  Here is the output :

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, image2, from '*.jpg':
  Duration: 00:01:06.32, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'timelapse.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x55a43cfb1d00] using SAR=1/1
[libx264 @ 0x55a43cfb1d00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x55a43cfb1d00] profile High, level 4.0
[libx264 @ 0x55a43cfb1d00] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=12 lookahead_threads=2 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=20 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 'timelapse.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 20 fps, 10240 tbn, 20 tbc
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=   72 fps= 11 q=-1.0 Lsize=   10663kB time=00:00:03.45 bitrate=25318.0kbits/s speed=0.507x    
video:10661kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.015737%
[libx264 @ 0x55a43cfb1d00] frame I:5     Avg QP:23.69  size:223467
[libx264 @ 0x55a43cfb1d00] frame P:33    Avg QP:26.52  size:139314
[libx264 @ 0x55a43cfb1d00] frame B:34    Avg QP:28.49  size:152989
[libx264 @ 0x55a43cfb1d00] consecutive B-frames: 33.3%  8.3%  8.3% 50.0%
[libx264 @ 0x55a43cfb1d00] mb I  I16..4:  2.2% 96.6%  1.2%
[libx264 @ 0x55a43cfb1d00] mb P  I16..4:  2.1% 78.8%  1.5%  P16..4:  9.4%  4.7%  2.6%  0.0%  0.0%    skip: 0.8%
[libx264 @ 0x55a43cfb1d00] mb B  I16..4:  1.1% 20.4%  2.3%  B16..8: 27.6% 13.7%  5.3%  direct:22.7%  skip: 6.9%  L0:33.5% L1:32.2% BI:34.3%
[libx264 @ 0x55a43cfb1d00] 8x8 transform intra:93.8% inter:86.5%
[libx264 @ 0x55a43cfb1d00] coded y,uvDC,uvAC intra: 91.5% 66.0% 17.4% inter: 77.7% 58.7% 2.2%
[libx264 @ 0x55a43cfb1d00] i16 v,h,dc,p: 13% 56%  3% 28%
[libx264 @ 0x55a43cfb1d00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 39%  4%  3%  3%  4%  4%  8%
[libx264 @ 0x55a43cfb1d00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 28% 12%  5%  7%  7%  6%  7%  8%
[libx264 @ 0x55a43cfb1d00] i8c dc,h,v,p: 49% 29% 19%  3%
[libx264 @ 0x55a43cfb1d00] Weighted P-Frames: Y:30.3% UV:24.2%
[libx264 @ 0x55a43cfb1d00] ref P L0: 48.2% 17.7% 17.7% 13.3%  3.2%
[libx264 @ 0x55a43cfb1d00] ref B L0: 83.2% 14.2%  2.5%
[libx264 @ 0x55a43cfb1d00] ref B L1: 93.8%  6.2%
[libx264 @ 0x55a43cfb1d00] kb/s:24258.47