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• FFmpeg for marking time video based on a reference date

  29 décembre 2018, par Denio Mariz

  I am trying to mark a timestamp in a video using drawtext filter.
  FFmpeg easily marks timestamps based on localtime, gmtime or even PTS. However, I want to assign a reference time (start time) for the timestamp in order to represent the time the video was recorded (not encoded).

  Reading the documentation, I found that option basetime can be used for this purpose. However it seems that is not working or I am missing something.

  The command line I am using is :

  ffmpeg -y -i input.mp4 -filter_complex drawtext="fontfile=/tmp/UbuntuMono-B.ttf: fontsize=36: fontcolor=yellow: box=1: boxcolor=black@0.4: text='Wall Clock Time\: %{gmtime\:%Y-%m-%d %T}': basetime=1456007118" output.mp4

  By using basetime=1456007118, it was expected the start time was set to ’02/20/2016 20:25:18’ since 1456007118 is the UTC time for that time and date :

  date -d '02/20/2016 20:25:18' +"%s" # format MM/DD/AAAA hh:mm:ss
  
  1456007118

  However, no error is issued by FFmpeg and the video is marked with current GMT, ignoring basetime option.

  Any hint ?
  Thanks.

  Complete information about FFmpeg version and output is :

  ffmpeg -y -i /home/denio/Videos/Interstellar_2014_Trailer_4_5.1-1080p-HDTN.mp4 -filter_complex drawtext="fontfile=/tmp/UbuntuMono-B.ttf: fontsize=36: fontcolor=yellow: box=1: boxcolor=black@0.4: text='Wall Clock Time\: %{gmtime\:%Y-%m-%d %T}': basetime=1470226363" /tmp/x.mp4 
  
  ffmpeg version 3.1.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2.1) 20160413
  
    configuration: --enable-libxavs --enable-bzlib --enable-libfaac --enable-libfreetype --enable-libfontconfig --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-x11grab --enable-static --enable-pthreads --enable-gpl --enable-nonfree --enable-version3 --disable-ffserver --enable-libgsm --enable-librtmp --enable-libvpx --enable-libschroedinger --enable-libopencore-amrnb --enable-libopenjpeg
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  ...
  
  ...

• Can't process RTP video stream from Firefox browser or Python based scripts by FFMPEG

  3 avril 2023, par Gentelam.S

  Any time I want to process (forward, analyze, copy, ...) RTP video stream from FF browser or python based scripts by FFMPEG, it "chucks" and can't work with it. Seems to be stream encoding issue.
I have a Janus server where clients join from browsers or anothers services, like Python, then I forward the stream to the URL, where FFMPEG is listening on. There is no issue when I try to process any forwarded stream coming from Chrome based browsers, but the problem occurs when I join from FF or Python.

  


  I run ffmpeg in Ubuntu container.
The command I use :
-loglevel trace -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp -i port4000.sdp -vf scale=1280:720 -vcodec libx264 -profile:v baseline -preset:v ultrafast -acodec aac -f flv -flvflags no_duration_filesize {{rtmpUrl}}

  


  I used also very simple commands like the following but the result is the same :
ffmpeg -protocol_whitelist file,udp,rtp -i ./SDP/port4000.sdp -c copy -t 10 -y test.mkv

  


  The SDP file I use :

  


  SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 58.29.100
m=video 4000 RTP/AVP 96
b=AS:200
a=rtpmap:96 VP8/90000


  


  The screens below depicts how FFMPEG behaves in case of FF and Chrome (loglevel of ffmpeg set to trace).

  


  Firefox :
enter image description here

  


  Chrome :
enter image description here

  


  enter image description here

  


  enter image description here

  


  enter image description here

  


  It looks like it brokes after the following log : Before avformat_find_stream_info() pos: xxx

  


  (Same problem is if I try to run ffprobe)
Thank you for any suggestion.

  


  As described above, I tried quite a lot of of arguments running ffmpeg, different SDP files but seems to be not enough. I want the stream to be procced properly by FFMEPG.

  


• hlsenc : add use_localtime_mkdir option to automatically create time-based directory

  3 février 2016, par Johan Ström

  hlsenc : add use_localtime_mkdir option to automatically create time-based directory
  Use with -use_localtime, and set -hls_segment_filename to a path which
  
  contains a subdirectory i.e. /some/path/%Y%m%d/%Y%m%dT%H%M%S-%s.ts
  
  This will mkdir the %Y%m%d-part of the path if it does not already
  
  exist.
  
  In addition, each filename in the playlist output will be prefixed with
  
  this subdirectory (if playlist and segment shares the same base path).
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/hlsenc.c