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• How to drawtext colon with pts gmtime using ffmpeg ?

  6 décembre 2019, par Milan Tejani

  I am adding timestamp to video using FFMPEG where i am using below command :

  ffmpeg -y -i input.mp4 -vf "drawtext=fontfile=roboto.ttf:fontsize=36:fontcolor=yellow:text='%{pts\:gmtime\:1575526882\:%d/%m/%y %H:%M}'" -preset ultrafast -f mp4 output.mp4

  in this command i am using : between %H and %M in text attribute of drawtext

  text='%{pts\:gmtime\:1575526882\:%d/%m/%y %H:%M}'

  because i want to print time like this 06:25

  it show me this error :

  Unterminated %{} near ’pts:gmtime:1575526882 :%d/%m/%y %H’

  how can i print : between %H and %M where %H is for hours and %M is for minutes ?

• Creating a video with a background colour and animated text - BEGINNER

  7 avril 2017, par Illep

  I want to generate a video that will display a yellow background colour for 2 seconds. Then display some animated text from the 6th to 10th second.

  I have tried the animated text and it works ok (code given below). But, I need to only display it from the 6th to 10th second. How can I do this ?

  I also need to know how to add a background colour and make it display from the 1st to 5th second.

  My workings so far :

  ffmpeg -y -i video.mp4 -acodec libmp3lame -vcodec libx264 -pix_fmt yuv420p -b:a 192k -b:v 1400k -ar 44100 -crf 18 -vf "drawtext=text=string1 string2 string3 string4 string5 string6 string7 :expansion=normal:fontfile=SIXTY.ttf: y=h-line_h-10:x=(mod(5*n\,w+tw)-tw): fontcolor=white: fontsize=40: shadowx=2: shadowy=2" -an left_to_right_small.mp4

• Recording RTP VP8 packets with FFMPEG with named pipe

  6 août 2015, par Filipe Apolinário

  I’m developing a WebRTC video session recorder, in a gateway developed in C++, where I only have access to individual RTP packets.

  When a session starts, I create two threads one that initializes a named pipe and an other that starts FFMPEG to fetch data from that pipe and store it in a matroska file, with the command :

  ffmpeg -i \\.\pipe\screenRec -f matroska D:\djhfifj.mkv

  Whenever I receive an RTP packet I send it through the pipe to FFMPEG. Although all communication is working fine, FFMPEG does not seem to be recognizing the RTP packet :

  ffmpeg version N-73633-gdfc5858 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 28.100 / 54. 28.100
  
    libavcodec     56. 47.100 / 56. 47.100
  
    libavformat    56. 40.100 / 56. 40.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 21.100 /  5. 21.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [aac @ 031b3fc0] Format aac detected only with low score of 1, misdetection possible!
  
  [aac @ 031bd820] More than one AAC RDB per ADTS frame is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
  
  [aac @ 031bd820] channel element 3.13 is not allocated
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (26) exceeds limit (9).
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (60) exceeds limit (44).
  
  [aac @ 031bd820] Number of bands (6) exceeds limit (4).
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (30) exceeds limit (23).
  
  [aac @ 031bd820] Sample rate index in program config element does not match the sample rate index configured by the container.
  
  [aac @ 031bd820] Inconsistent channel configuration.
  
  [aac @ 031bd820] get_buffer() failed
  
  [aac @ 031bd820] Assuming an incorrectly encoded 7.1 channel layout instead of a spec-compliant 7.1(wide) layout, use -strict 1 to decode according to the specification instead.
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (16) exceeds limit (11).
  
  [aac @ 031bd820] Dependent coupling is not supported together with LTP
  
      Last message repeated 9 times
  
  [aac @ 031bd820] channel element 3.5 is not allocated
  
  [aac @ 031bd820] channel element 3.13 is not allocated
  
  [aac @ 031bd820] channel element 3.3 is not allocated
  
  [aac @ 031bd820] Number of bands (16) exceeds limit (14).
  
  [aac @ 031bd820] channel element 3.10 is not allocated
  
  [aac @ 031bd820] channel element 3.2 is not allocated
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of scalefactor bands in group (61) exceeds limit (43).
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (29) exceeds limit (13).
  
  [aac @ 031bd820] Sample rate index in program config element does not match the sample rate index configured by the container.
  
  [aac @ 031bd820] Inconsistent channel configuration.
  
  [aac @ 031bd820] get_buffer() failed
  
  [aac @ 031bd820] channel element 0.7 is not allocated
  
  [aac @ 031bd820] Number of bands (24) exceeds limit (15).
  
  [aac @ 031bd820] channel element 1.1 is not allocated
  
  [aac @ 031bd820] channel element 2.0 is not allocated
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of scalefactor bands in group (62) exceeds limit (41).
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (15) exceeds limit (13).
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (23) exceeds limit (2).
  
  [aac @ 031bd820] channel element 1.4 is not allocated
  
  [aac @ 031bd820] Assuming an incorrectly encoded 7.1 channel layout instead of a spec-compliant 7.1(wide) layout, use -strict 1 to decode according to the specification instead.
  
  [aac @ 031bd820] channel element 1.2 is not allocated
  
  [aac @ 031bd820] channel element 1.8 is not allocated
  
  [aac @ 031bd820] channel element 3.7 is not allocated
  
  [aac @ 031bd820] channel element 2.9 is not allocated
  
  [aac @ 031bd820] channel element 3.8 is not allocated
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of scalefactor bands in group (48) exceeds limit (43).
  
  [aac @ 031bd820] channel element 3.8 is not allocated
  
  [aac @ 031bd820] channel element 2.13 is not allocated
  
  [aac @ 031bd820] channel element 3.4 is not allocated
  
  [aac @ 031bd820] Dependent coupling is not supported together with LTP
  
      Last message repeated 13 times
  
  [aac @ 031bd820] channel element 2.14 is not allocated
  
  [aac @ 031bd820] SBR was found before the first channel element.
  
  [aac @ 031bd820] Sample rate index in program config element does not match the sample rate index configured by the container.
  
  [aac @ 031bd820] Inconsistent channel configuration.
  
  [aac @ 031bd820] get_buffer() failed
  
  [aac @ 031bd820] Number of bands (6) exceeds limit (5).
  
  [aac @ 031bd820] channel element 3.0 is not allocated
  
  [aac @ 031bd820] channel element 1.5 is not allocated
  
  [aac @ 031bd820] channel element 1.13 is not allocated
  
  [aac @ 031bd820] channel element 1.7 is not allocated
  
  [aac @ 031bd820] channel element 2.0 is not allocated
  
  [aac @ 031bd820] Dependent coupling is not supported together with LTP
  
      Last message repeated 13 times
  
  [aac @ 031bd820] channel element 3.0 is not allocated
  
  [aac @ 031bd820] Assuming an incorrectly encoded 7.1 channel layout instead of a spec-compliant 7.1(wide) layout, use -strict 1 to decode according to the specification instead.
  
  [aac @ 031bd820] SBR was found before the first channel element.
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (31) exceeds limit (30).
  
  [aac @ 031bd820] channel element 1.12 is not allocated
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] Number of bands (29) exceeds limit (10).
  
  [aac @ 031bd820] channel element 3.2 is not allocated
  
  [aac @ 031bd820] channel element 3.15 is not allocated
  
  [aac @ 031bd820] channel element 1.5 is not allocated
  
  [aac @ 031bd820] channel element 2.7 is not allocated
  
  [aac @ 031bd820] channel element 1.9 is not allocated
  
  [aac @ 031bd820] Number of bands (54) exceeds limit (34).
  
  [aac @ 031bd820] channel element 1.6 is not allocated
  
  [aac @ 031bd820] channel element 1.2 is not allocated
  
  [aac @ 031bd820] channel element 3.7 is not allocated
  
  [aac @ 031bd820] Reserved bit set.
  
  [aac @ 031bd820] ms_present = 3 is reserved.
  
  [aac @ 031b3fc0] decoding for stream 0 failed
  
  [aac @ 031b3fc0] Could not find codec parameters for stream 0 (Audio: aac (LTP), 4.0, fltp, 1506 kb/s): unspecified sample rate
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  \\.\pipe\screenRec96: could not find codec parameters
  
  Input #0, aac, from '\\.\pipe\screenRec96':
  
    Duration: N/A, bitrate: 1506 kb/s
  
      Stream #0:0: Audio: aac (LTP), 4.0, fltp, 1506 kb/s
  
  [abuffer @ 0435cd00] Value inf for parameter 'time_base' out of range [0 - 2.14748e+009]
  
      Last message repeated 3 times
  
  [abuffer @ 0435cd00] Error setting option time_base to value 1/0.
  
  [graph 0 input from stream 0:0 @ 0319afe0] Error applying options to the filter.
  
  Error opening filters!

  Is it possible to make FFMPEG understand that the packet sent is RTP with VP8 ?