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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.

  


• FFmpeg/FFplay directshow and blackmagic

  21 janvier 2016, par max246

  I got a BlackMagic intensity pro 4k capturing card, which is working fine with the express tool, I can see the live feed and record, but after I tried different stuff from what I found online to make ffplay/ffmpeg working, I ended up to have just a black screen.

  I have checked if all the versions of my ffmpeg files were eanable-decklinnk, I have compiled the latest one with the latest version of the api, but still I get a black screen instead of the actually feed.

  ffmpeg -list_devices true -f dshow -i dummy
  
  ffmpeg version N-77245-g7209c94 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  
    configuration:  --enable-avisynth --enable-libbluray --enable-libcaca --enable -libass --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
  
   --enable-libschroedinger --enable-libsoxr --enable-libtwolame --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libopus --enable-libtesseract --
  
  enable-libdcadec --enable-libbs2b --enable-libmfx --enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-opengl --enable-libvpx --enable-libkvaza
  
  ar --enable-libwebp --enable-decklink --enable-libgme --disable-w32threads --enable-opencl --enable-libzimg --enable-openssl --disable-debug
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  [dshow @ 0000000ba36b6480] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 0000000ba36b6480]  "Blackmagic WDM Capture"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_pnp_\\?\decklink#avstream#5&2550cef9&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\decklinkcapture1"
  
  [dshow @ 0000000ba36b6480]  "Decklink Video Capture"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{44A8B5C7-13B6-4211-BD40-35B629D9E6DF}"
  
  [dshow @ 0000000ba36b6480] DirectShow audio devices
  
  [dshow @ 0000000ba36b6480]  "Wej?øcie liniowe (Blackmagic Audio)"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{977E2DB6-B17C-4343-9018-652924C20A8C}"
  
  [dshow @ 0000000ba36b6480]  "Decklink Audio Capture"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{AAA22F7E-5AA0-49D9-8C8D-B52B1AA92EB7}"
  
  dummy: Immediate exit requested

  The result above tells me that ffmpeg can see the card and I am able to open a communication, I have checked one post where it says you need to specific which input type is showing, otherwise it will never work, and I did that, but still no luck.

  By running the command line above, I can only see a black screen but not actually errors.

  I am running Windows 8.1 64bit.

  ffplay  -pixel_format uyvy422 -framerate 25 -f dshow -i video="Decklink Video Capture"  -format x264
  
  ffplay version N-77245-g7209c94 Copyright (c) 2003-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  
    configuration:  --enable-avisynth --enable-libbluray --enable-libcaca --enable-libass --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
  
   --enable-libschroedinger --enable-libsoxr --enable-libtwolame --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libopus --enable-libtesseract --
  
  enable-libdcadec --enable-libbs2b --enable-libmfx --enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-opengl --enable-libvpx --enable-libkvaza
  
  ar --enable-libwebp --enable-decklink --enable-libgme --disable-w32threads --enable-opencl --enable-libzimg --enable-openssl --disable-debug
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  Input #0, dshow, from 'video=Decklink Video Capture':    0B f=0/0
  
    Duration: N/A, start: 0.138773, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x576, 25 tbr,
  
  10000k tbn, 25 tbc
  
     1.51 M-V: -0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

• nginx RTMP to HLS : FFMPG error when trying multiple bitrate output [closed]

  28 mai 2014, par user3685074

  I’m currently trying to convert my RTMP Livestream into a HLS with 3 quality-settings.

  I followed this guide

  I’ve compiled my own FFMPEG and it’s working if I just convert 1 file.
  It seems libx264 isn’t able to do multiple encodings at the same time ?

  I’m using these command :

          exec /usr/local/bin/ffmpeg -i rtmp://localhost/src/$name 
  
          -c:a libfdk_aac -b:a 32k   -c:v libx264 -b:v 128K -f flv rtmp://localhost/hls/$name_low 
  
          -c:a libfdk_aac -b:a 64k   -c:v libx264 -b:v 256K -f flv rtmp://localhost/hls/$name_mid 
  
          -c:a libfdk_aac -b:a 128k  -c:v libx264 -b:v 512K -f flv rtmp://localhost/hls/$name_hi  2>>/tmp/ffmpeg.log;

  this is the output :

      ffmpeg version N-63519-g61917a1 Copyright (c) 2000-2014 the FFmpeg developers
  
        built on May 28 2014 18:06:42 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
  
        configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-x11grab --enable-libvpx --enable-libmp3lame --enable-librtmp --enable-libspeex --enable-libfdk_aac
  
        libavutil      52. 87.100 / 52. 87.100
  
        libavcodec     55. 65.100 / 55. 65.100
  
        libavformat    55. 41.100 / 55. 41.100
  
        libavdevice    55. 13.101 / 55. 13.101
  
        libavfilter     4.  5.100 /  4.  5.100
  
        libswscale      2.  6.100 /  2.  6.100
  
        libswresample   0. 19.100 /  0. 19.100
  
        libpostproc    52.  3.100 / 52.  3.100
  
      Metadata:
  
        Server                NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
        width                 1280.00
  
        height                720.00
  
        displayWidth          1280.00
  
        displayHeight         720.00
  
        duration              0.00
  
        framerate             25.00
  
        fps                   25.00
  
        videodatarate         390.00
  
        videocodecid          0.00
  
        audiodatarate         27.00
  
        audiocodecid          11.00
  
      Input #0, flv, from 'rtmp://localhost/src/test':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
        Duration: 00:00:00.00, start: 0.080000, bitrate: N/A
  
          Stream #0:0: Video: h264 (High), yuv420p, 1280x720, 399 kb/s, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
          Stream #0:1: Audio: speex, 16000 Hz, mono, s16, 27 kb/s
  
      [libx264 @ 0x5260380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
      [libx264 @ 0x5260380] profile High, level 3.1
  
      [libx264 @ 0x5260380] 264 - core 142 r2431 f23da7c - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=24 lookahead_threads=4 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=abr mbtree=1 bitrate=128 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
      [libx264 @ 0x525a920] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
      Output #0, flv, to 'rtmp://localhost/hls/test_low':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
          Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720, q=-1--1, 128 kb/s, 25 fps, 90k tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc55.65.100 libx264
  
          Stream #0:1: Audio: aac (libfdk_aac), 16000 Hz, mono, s16, 32 kb/s
  
          Metadata:
  
            encoder         : Lavc55.65.100 libfdk_aac
  
      Output #1, flv, to 'rtmp://localhost/hls/test_mid':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
          Stream #1:0: Video: h264, yuv420p, 1280x720, q=-1--1, 256 kb/s, 25 fps, 90k tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc55.65.100 libx264
  
          Stream #1:1: Audio: aac, 16000 Hz, mono, s16
  
          Metadata:
  
            encoder         : Lavc55.65.100 libfdk_aac
  
      Output #2, flv, to 'rtmp://localhost/hls/test_hi':
  
        Metadata:
  
          Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
          displayWidth    : 1280
  
          displayHeight   : 720
  
          fps             : 25
  
          profile         : 
  
          level           : 
  
          Stream #2:0: Video: h264, yuv420p, 1280x720, q=-1--1, 25 fps, 90k tbn, 25 tbc
  
          Metadata:
  
            encoder         : Lavc55.65.100 libx264
  
          Stream #2:1: Audio: aac, 16000 Hz, mono, s16
  
          Metadata:
  
            encoder         : Lavc55.65.100 libfdk_aac
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 -> libx264)
  
        Stream #0:1 -> #0:1 (libspeex -> libfdk_aac)
  
        Stream #0:0 -> #1:0 (h264 -> libx264)
  
        Stream #0:1 -> #1:1 (libspeex -> libfdk_aac)
  
        Stream #0:0 -> #2:0 (h264 -> libx264)
  
        Stream #0:1 -> #2:1 (libspeex -> libfdk_aac)
  
      Error while opening encoder for output stream #1:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I hope you can help me and sorry for my bad english.

  Greetz
  Kevin