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• ffmpeg - timestamp sync of same mp4-video in 1fps and 25fps - not possible ?

  5 décembre 2016, par chuckice

  I am using ffmpeg-3.2 to encode two formats of the same mp4-Video.
  I start with recording footage from a tv-receiver, where i get .ts-format.

  First thing i do, is transcoding an .ts-Stream with this ffmpeg-parameters :

  ffmpeg input.ts -crf 28 -c:v libx264 -an -preset medium -y -vf "fps=25,yadif,drawtext=fontfile=/usr/share/fonts/truetype/droid/DroidSans.ttf: text='%{pts}': fontcolor=green: box=1: boxcolor=0x00000000@1: x=10: y=20: fontsize=40" -vsync cfr -copyts -start_at_zero -force_key_frames 00:00:0.00 input.mp4

  After this, i transcode the new mp4 with :

  ffmpeg -i input.mp4 -y -vf "fps=25,drawtext=fontfile=/usr/share/fonts/truetype/droid/DroidSans.ttf: text='%{pts}': fontcolor=white: box=1: boxcolor=0x00000000@1: x=10: y=50: fontsize=40" -vsync cfr -force_key_frames 00:00:0.00 output-fps25.mp4

  Then i run :

  ffmpeg -i input.mp4 -y -vf "fps=1,scale=768:576,drawtext=fontfile=/usr/share/fonts/truetype/droid/DroidSans.ttf: text='%{pts}': fontcolor=yellow: box=1: boxcolor=0x00000000@1: x=10: y=70: fontsize=40" -vsync cfr -force_key_frames 00:00:0.00 output-fps1.mp4

  But, as you can see on the follwing snapshot, they are not sync :
  screenshot with all timestamps

  Of course i am missing a parameter, but it seems hart to find for me. Anyone familiar with this kind of problem ?

  When i create screenshots for the first 5s, the following timestamps correspond to the -ss paramter
   ss param, timestamp from screenshot

  • 0, 0
  • 1, 0.04
  • 2, 0.88
  • 3, 1.88
  • 4, 2.88

  How could i reset the stream somehow to get

  • 0, 0
  • 1, 1
  • 2, 2
  • 3, 3
  • 4, 4

  Have a nice day, Lars

• FFMPEG video editing application. Need time and date stamp burned into video

  11 mai 2022, par Jacob

  I am developing an application for video editing. The main component of this application is to produce a single video file from several video files captured from a camcorder with the time and date stamp displayed on the final rendered video, much like the final product from a security camera. I have figured out, by using FFMPEG, how to burn the date and time into the video with a .SRT file as well as with DrawText like the following :

  


  ffmpeg -y -i video.mp4 -vf “drawtext=fontfile=roboto.ttf:fontsize=12:fontcolor=yellow:text='%{pts\:localtime\:1575526882\:%A, %d, %B %Y %I\\\:%M\\\:%S %p}'" -preset ultrafast -f mp4 output_new.mp4    


  


  I would rather use the DrawText method so the user does not have to wait longer while creating the .SRT files. I am new to FFMPEG and I find their documentation very confusing. I guess I am hoping there is someone out there who has experience with it.

  


  Everything seems to work when I pass in the date created meta data from the video file and drawtext just does its thing. The problem is my application allows for editing of the video. I do this, for lack of better solution, by allowing the user to select beginning and ending frames they do not want, from the UI and then the code simply deletes the frames from the directory where they were split and saved. I then use FFMPEG to iterate through the directory and combine the remaining frames to make a video file.

  


  This approach starts the time and date from the date created metadata ; however, cutting the frames out of the video will make the DT stamp inaccurate, due to the missing frames.

  


  Is there any way to tell FFMPEG to burn in the date and time from date/time retrieved from each individual frame ? I appreciate any advice that you may have.

  


• unknown encoder libx264 windows

  28 novembre 2012, par shampoo

  i am testing clip bucket on a windows xp system , clip bucket (open source video share) uses ffmpeg to convert videos, the final command clip bucket executes is (i changed it a little to make it compatible with the current ffmpeg) :

  D:\ffmpeg-snapshot-git\ffmpeg\ffmpeg.exe -i C:
  
  \wamp\www\chclip/files/conversion_queue/1352973741c353c.mp4 -f flv -vcodec libx2
  
  64 -pre normal -r 25 -s 426x240 -aspect 1.775 -vf "pad=10:20:30:40:yellow"  -ac
  
  odec libfaac -ab 128000 -ar 22050 C:\wamp\www\chclip/files/videos/13540939451e18
  
  4.flv 2> C:\wamp\www\chclip/files/temp/13540939461c124.tmp 2>&1

  and this is the response i get

  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Nov 19 2012 16:42:42 with gcc 4.6.2 (GCC)
  
  configuration:
  
  libavutil      52.  8.100 / 52.  8.100
  
  libavcodec     54. 73.100 / 54. 73.100
  
  libavformat    54. 37.100 / 54. 37.100
  
  libavdevice    54.  3.100 / 54.  3.100
  
  libavfilter     3. 23.101 /  3. 23.101
  
  libswscale      2.  1.102 /  2.  1.102
  
  libswresample   0. 16.100 /  0. 16.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\wamp\www\chclip/files/conversion_que
  
  ue/1352973741c353c.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf53.21.0
  
  Duration: 00:00:51.67, start: 0.000000, bitrate: 344 kb/s
  
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 426x240 [
  
  SAR 1:1 DAR 71:40], 308 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
  
  Metadata:
  
  handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 31
  
  kb/s
  
  Metadata:
  
  handler_name    : SoundHandler
  
  Unknown encoder 'libx264'

  how can i get this libx264 working in windows ?