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• Displaying the current frame of a video after skipping using drawtext/start_number not evaluation any variables

  25 mars 2023, par DJ Quardaboff

  I would like to display the current frame number on a video while playing it with ffplay. I have already seen this solution, but when I seek to any part of the video, the counter resets. There's a variable, start_number, which the ffplay documentation says is The starting frame number for the n/frame_num variable. The default value is "0". It seems that n is set to that when starting the video or seeking between I-frames. I thought setting this variable to %{floor(t*60)} would solve my problem, but after running this :

  



  ffplay -i "video.mp4" -vf drawtext="fontsize=30:box=1:boxcolor=white:fontcolor=black:fontfile=/Windows/Fonts/arial.ttf:start_number=floor(t*60):text=%{n}"


  



  I got the following console output :

  



  ffplay version N-84679-gd65b595 Copyright (c) 2003-2017 the FFmpeg developers
  built with gcc 6.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 51.100 / 55. 51.100
  libavcodec     57. 86.103 / 57. 86.103
  libavformat    57. 67.100 / 57. 67.100
  libavdevice    57.  3.101 / 57.  3.101
  libavfilter     6. 78.100 /  6. 78.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':=    0B f=0/0
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2017-03-30T02:49:20.000000Z
    encoder         : Open Broadcaster Software v0.659b
  Duration: 00:05:36.85, start: 0.000000, bitrate: 72636 kb/s
    Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 162 kb/s (default)
    Metadata:
  creation_time   : 2017-03-30T02:49:20.000000Z
  handler_name    : Sound Media Handler
Stream #0:1(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-1), 2560x1440, 72465 kb/s, 60 fps, 60 tbr, 1k tbn, 120 tbc (default)
Metadata:
  creation_time   : 2017-03-30T02:49:20.000000Z
  handler_name    : Video Media Handler
  encoder         : AVC Coding
[drawtext @ 00000000122770e0] [Eval @ 0000000008f3eb60] Undefined constant or missing '(' in 't*60)'
[drawtext @ 00000000122770e0] Unable to parse option value "floor(t*60)"
[drawtext @ 00000000122770e0] [Eval @ 0000000008f3ebd0] Undefined constant or missing '(' in 't*60)'
[drawtext @ 00000000122770e0] Unable to parse option value "floor(t*60)"
[drawtext @ 00000000122770e0] Error setting option start_number to value floor(t*60).
[Parsed_drawtext_0 @ 000000000263eca0] Error applying options to the filter.
Error initializing filter 'drawtext' with args 'fontsize=30:box=1:boxcolor=white:fontcolor=black:fontfile=/Windows/Fonts/arial.ttf:start_number=floor(t*60):text=%{n}'
   0.01 A-V:    nan fd=   0 aq=   22KB vq= 5866KB sq=    0B f=0/0


  



  In fact, any variable in start_number's assignment invokes this error. I don't know if I have the correct syntax, but does this mean it doesn't evaluate expressions ? Or maybe it doesn't accept variables for some reason ?

  



  After that downer I tried just setting the text to %{t}, which played the video, but repeatedly gave this error and had no text in the top left corner :

  



  [Parsed_drawtext_0 @ 0000000003e54ea0] %{t} is not known 0B f=0/0


  



  So does the current time variable just not work in drawtext ?
  
Is there another way to write the current frame on the video or even on the console window ?

  



  Using Windows 10 Enterprise and the latest build of ffplay for windows at this time.

  


• can i speedup text watermarking on ffmpeg ?

  3 juin 2020, par Easy Tricks For Android

  This command i used ffmpeg -i "1.mp4" -vf "drawtext=text='watermak_name':x=w-tw-50:y=h-th-50:fontfile=/Windows/fonts/calibri.ttf:fontsize=20:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=2" "output.mp4". watermark is working with this command, but it takes more time up-to 3 hours +

  



  this is the log i got from cmd

  

  

D :>ffmpeg -i "1.mp4" -vf "drawtext=text='watermak_name':x=w-tw-50:y=h/2-th:fontfile=/Windows/fonts/
  courbd.ttf:fontsize=20:fontcolor=white" -max_muxing_queue_size 9999 "1_out.mp4"
  


  
ffmpeg version git-2020-05-23-26b4509 Copyright (c) 2000-2020 the FFmpeg developers
  
 built with gcc 9.3.1 (GCC) 20200523
  
 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-libsrt —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-libvmaf —enable-libvorbis
  —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom
  —disable-w32threads —enable-libmfx —enable-ffnvcodec —enable-cuda-llvm —enable-cuvid —enable-d3d11va
  —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt —enable-amf
  
 libavutil 56. 48.100 / 56. 48.100
  
 libavcodec 58. 87.101 / 58. 87.101
  
 libavformat 58. 43.100 / 58. 43.100
  
 libavdevice 58. 9.103 / 58. 9.103
  
 libavfilter 7. 83.100 / 7. 83.100
  
 libswscale 5. 6.101 / 5. 6.101
  
 libswresample 3. 6.100 / 3. 6.100
  
 libpostproc 55. 6.100 / 55. 6.100
  
Truncating packet of size 95 to 83
  
Input #0, matroska,webm, from 'Uriyadi.mkv' :
  
 Metadata :
  
 title : Downloaded From ABCD
  
 encoder : Downloaded From ABCD
  
 creation_time : 2020-05-22T16:44:46.000000Z
  
 Duration : 02:11:50.86, start : 0.000000, bitrate : 750 kb/s
  
 Stream #0:0(mal) : Video : h264 (High), yuv420p(progressive), 720x304 [SAR 1:1 DAR 45:19], 25 fps, 25 tbr, 1k
  tbn, 50 tbc (default)
  
 Metadata :
  
 title : Downloaded From ABCD
  
 Stream #0:1(mal) : Audio : mp3, 48000 Hz, stereo, fltp, 65 kb/s (default)
  
 Metadata :
  
 title : Downloaded From ABCD
  
Stream mapping :
  
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
 Stream #0:1 -> #0:1 (mp3 (mp3float) -> vorbis (libvorbis))
  
Press [q] to stop, [?] for help
  
Fontconfig error : Cannot load default config file
  
[Parsed_drawtext_0 @ 000001a470fe3f00] Using "C :/Windows/fonts/mingliub.ttc"
  
[libx264 @ 000001a470a10600] using SAR=1/1
  
[libx264 @ 000001a470a10600] using cpu capabilities : MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
[libx264 @ 000001a470a10600] profile High, level 3.0, 4:2:0, 8-bit
  
[libx264 @ 000001a470a10600] 264 - core 159 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 -
  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=9 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, matroska, to '1_out.mp4' :
  
 Metadata :
  
 title : Downloaded From ABCD
  
 encoder : Lavf58.43.100
  
 Stream #0:0(mal) : Video : h264 (libx264) (H264 / 0x34363248), yuv420p, 720x304 [SAR 1:1 DAR 45:19], q=-1—1,
  25 fps, 1k tbn, 25 tbc (default)
  
 Metadata :
  
 title : Downloaded From ABCD
  
 encoder : Lavc58.87.101 libx264
  
 Side data :
  
 cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : N/A
  
 Stream #0:1(mal) : Audio : vorbis (libvorbis) (oV[0][0] / 0x566F), 48000 Hz, stereo, fltp (default)
  
 Metadata :
  
 title : Downloaded From ABCD
  
 encoder : Lavc58.87.101 libvorbis
  
frame=35791 fps=308 q=28.0 size= 107264kB time=00:23:52.10 bitrate= 613.6kbits/s speed=12.3x
  


• FFmpeg 3.3.4 avfoundation to record only a specific section of the screen on macOS Sierra using the command line

  16 octobre 2017, par antedesk

  I’m using FFmpeg version 3.3.4 (installed via brew) through the command line to record my desktop during some automated tests on my macOS Sierra (10.12.6).

  I would like to record only a specific section of the screen but, unfortunately, I’m not able to find the proper options in the documentation to reach my goal.

  According to the FFmpeg documentation for avfoundation, this is the command I use :

  ffmpeg 
  
  -f avfoundation    // avfoundation
  
  -pix_fmt uyvy422   // pixel format
  
  -i 1               // input: desktop
  
  -r 30              // framerate for output
  
  [PATH]/test.mp4      // filename

  When I run this command I have the following output :

  ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.37)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.4 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --enable-openssl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3 --enable-nonfree --enable-vda
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  [avfoundation @ 0x7fb7d4005800] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, avfoundation, from '1':
  
    Duration: N/A, start: 7263.782833, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1920x1080, 1000k tbr, 1000k tbn, 1000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x7fb7d4028400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7fb7d4028400] profile High 4:2:2, level 4.0, 4:2:2 8-bit
  
  [libx264 @ 0x7fb7d4028400] 264 - core 148 r2795 aaa9aa8 - 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=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 '[PATH]/test.mp4':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=   83 fps= 28 q=-1.0 Lsize=     525kB time=00:00:02.66 bitrate=1612.6kbits/s dup=1 drop=0 speed=0.889x

  I tried to use the -video_size option to set the video frame size, but it doesn’t work.