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• Blender VSE Audio out-of-sync when animation (video) is rendered

  21 août 2021, par Siddhant Shenoy

  Ok, so I found out that Blender has this really cool video-editing interface and I was beginning to love it. Until, I created this awesome project composition and when I exported the animation as a video file, the audio was out of sync :(.

  



  Actual Problem

  



  Audio is in-sync with video when the animation is played in Blender but is out-of-sync in the rendered video.

  



  Solutions I tried out and failed

  



  

  • I used the 'Audio-Sync' option in the sequencer but that made no difference.

  


  • Then I thought that my scene audio frequency might have been an issue since it was initially 48kHz and my videos were at 24kHz, so I changed the scene audio frequency to 24kHz, this still failed to solve the issue.

  


  • Initially, I was combining videos with different frame rates and thought that might have been an issue (although animation played as expected in Blender), so I recreated the source videos to ensure all videos I was using in my project had the same frame rate, but this also did not work.

  


  • Someone online suggested exporting the video and audio separately and then combining them using a command-line tool like FFMPEG, this also failed.

  


  



  What's really frustrating

  



  


  • This lag (audio is a few frames ahead of the video) is noticeable only in longer videos (>12 mins, my video is 1 hr long) suggesting a very small rendered rate difference between the video and the audio.

  


  • Also, note that the animation plays absolutely fine in Blender, so all I could figure out was that this was a rendering issue.

  


  



  So if anyone figured this out please let me know. I am a noob in video/audio codecs so please forgive me if I used some incorrect nomenclature above.

  


• Use ffmpeg to stream an updating progress-bar

  24 juin 2020, par Falk

  Is there a way to stream a filling progress-bar showing a percentage written in either a (e.g. txt) file or mysql db that updates often ? Ideally streaming to obs or straight to the platform/stream (such as twitch) ?

  


  I thought about using the text function, something like this :
  
-vf "drawtext=fontsize=40:fontfile=FreeSerif.ttf:textfile=/path/livetext.txt:x=(w-text_w)/2:y=(h-text_h)/2:reload=1"

  


• FFmpeg concat : timecode altered

  25 août 2021, par marcelo_nyc

  I'm using the concat option in FFmpeg to glue together GoPro footage chapters. However ffmpeg alters the timecodes significantly in ways that I cannot understand—it does not null them, it changes it. In fact, even using concat to concatenate one single file alters the timecode. E.g. I have a clip starting 10:59:47:14 and upon concatenating just this one file generates an identical file starting at 11:22:32:16.

  


  Any help please...