Sur d’autres sites (9467)

• avi encoded to streaming mp4 or webmnot playing in html5 player

  30 mai 2013, par Vprnl

  [EDIT]

  I'm trying to get ffmpeg to encode various AVI files to mp4 for streaming purposes

  I use this nodejs to start FFMPEG.

  When I try this (webm) (some settings are wrapped by the node module but produce the default FFMPEG command) with this command :

          .withVideoCodec('libvpx')
  
          .addOptions(['-bf 8','-bt 240k','-preset fast','-strict -2','-b:v 320K','-bufsize 62000', '-maxrate 620k','-movflags +empty_moov','-y'])
  
          .withAudioBitrate('192k')
  
          .withAudioCodec('libvorbis')
  
          .toFormat('webm')

  The video get's streamed properly to the client but the duration isn't passed on. So the video has a duration of 'infinite'.

  So I tried to encode with H264. Which also works (I see the duration being set in the client) but no picture sadly.

  For H264 I use :

     .addOptions(['-y','-vcodec libx264','-bf 8','-bt 240k','-preset fast','-strict -2','-b:v 320K','-bufsize 62000', '-maxrate 620k','-acodec aac','-ab 128k','-movflags +empty_moov'])
  
     .toFormat('mp4')

  I get this log :

  

  I hope someone can point me in the right direction. Thanks !

  The client just gives an undefined error.
  I hope someone can point me in the right direction.

  Thanks

• Adding a border to ffmpeg video [ffmpeg-python]

  17 décembre 2019, par GRS

  I am making a xmas card and I need to embed the video inside a card on the right (inside the border) and have some text displayed on the left.

  For simplicity, let’s assume I have a box with a hole which is transparent. I would like to display the video inside that hole.

  I am using ffmpeg-python and it would be great to see examples of how it can be achieved. It’s also fine to post a native ffmpeg solution, although there are some example of that I believe already.

  From what I understand, I need to always start with a master node e.g. the biggest node, and place the video inside the hole.

  However, when I try something like :

  import ffmpeg
  
  
  
  in_file = ffmpeg.input('video.mp4')
  
  border_box = ffmpeg.input('box.png')
  
  
  
  
  
  (
  
      ffmpeg.overlay(
  
          border_box, in_file, x=50, y=50
  
      )
  
      .output('out.mp4')
  
      .run()
  
  )

  It doesn’t work. But vice versa, e.g. putting a border box inside the video doesn’t work as it overlays borders of the video.

  What I think needs to be done

  1. Create an infinite video from a static box.png
  2. Overlay, while scaling both streams appropriately
  3. Create output

  Here is what I’m trying to achieve :
  

  The reason for transparency is because it’s not actually a rectangle. I could place a video inside a heart shape etc.

• OBS and OBS Portable Recording Into Same File Simultaneously

  26 juin 2020, par aerodavo

  Corrupted video file, FFprobe output text file, and FFmpeg output text files are all available to download here :
https://drive.google.com/drive/folders/1R0Y5plgkhTWWFNNKgSNJ5yitpKQbIKgg?usp=sharing

  


  I'm hoping there is a way to extract good video and audio from this video file, this was for a very important job that is impossible to do again. The video linked is a 1 minute recreation of the exact same problem... the actual video file is confidential (for a legal court case) and is much longer/larger. I used the exact same settings, the only difference was the window OBS was capturing (I used a YouTube video as opposed to the videoconference software window used for the deposition).

  


  Here's what happened :

  


  In OBS and OBS Portable, I had the save location set to the same exact folder (this was not how I intended it to be, but I made a last minute change to accommodate what I suspected was a faulty hard drive). I also had a hotkey to start recording on both apps simultaneously. I left the auto-naming scheme in place for both instances of OBS since they were supposed to be saving to two totally different external hard drives. I have since changed the auto-naming so it won't happen again, but this perfect storm resulted in both recordings being written into a single file (see link above), instead of two files as intended. It is unplayabe in VLC.

  


  I ran an FFprobe (available via link above), and found that there are 8 streams in the file. Each file should have had 4 streams (1 video and 3 audio streams per my setup in OBS), so at first glance it looks like all the data is there in some form/arrangement.

  


  I tried to map the 0:0 stream to a new file and tried the same thing with the 0:4 stream (these are the video streams), but did not have any luck extracting good video. Here are the two things I ran (again see link above for text files with full FFmpeg ouput of each) :

  


  ffmpeg -i C :\Users\David\Videos\2020-06-23_17-39-32_corrupted.mkv -map 0:0 -c copy C :\Users\David\Videos\2020-06-23_17-39-32_corrupted_map0-0.mkv

  


  ffmpeg -i C :\Users\David\Videos\2020-06-23_17-39-32_corrupted.mkv -map 0:4 -c copy C :\Users\David\Videos\2020-06-23_17-39-32_corrupted_map0-4.mkv

  


  It seems the audio is intact, as I was able to map one of the audio streams into a wav file... although there seemed to be extra/repeated audio tacked onto where the video/audio should have ended...

  


  It looks to me like both video streams got written into stream 0:0, while stream 0:4 looks empty (because this map results in a very small file). However the thing that's weird (and maybe promising) is that when I play the corrupted file in VLC, it mostly looks like smeared digital colors, but if I click around to different times in the video, it sometimes shows good video, even though it won't show any good video if you just play it from the beginning.

  


  My life would saved if there is a way to extract good video/audio from this corrupted file. Any help would be greatly appreciated, thanks in advance !