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• How to know the delay of frames between 2 videos, to sync an audio from video 1 to video 2 ?

  8 janvier 2021, par jaimepm

  world.

  


  I have many videos that I want to compare one-to-one to check if they are the same, and get from there the delay of frames, let's say. What I do now is opening both video files with virtualdub and checking manually at the beginning of video 1 that a given frame is at position, i.e., 4325. Then I check video 2 to see the position of the same frame, i.e., 5500. That would make a delay of +1175 frames. Then I check at the end of the video 1 another given frame, position let's say 183038. I check too the video 2 (imagine the position is 184213) and I calculate the difference, again +1175 : eureka, same video !
The frame I chose to compare aren't exactly random, it must be one that I know it is exactly one I can compare to (for example, a scene change, an explosion that appears from one frame to another, a dark frame after a lighten one...) and I always try to check for the first comparison frames within the first 10000 positions and for the second check I take at the end.
What I do next is to convert the audio from video 1 to video 2 calculating the number of ms needed, but I don't need help with that. I'd love to automatize the comparison so I just have to select video 1 and video 2, nothing else, that way I could forget forever virtualdub and save a lot of time.

  


  I'm tagging this post as powershell too because I'm making a script where at the moment I have to introduce the delay between frames (after comparing manually) myself. It would be perfect that I could add this at the beginning of the script.

  


  Thanks !

  


• The Mystery of the No such file or directory exception

  22 avril 2022, par JohnWick

  No idea what's going on here. Set a breakpoint after the for of loop in the following function. temp/concat.txt exists but the following exception is thrown :

  


  


  Uncaught Error Error : ffmpeg exited with code 1 : temp/concat.txt : No
such file or directory

  


  


  Outputting stderr gives a bit more info :

  


  


  [concat @ 000001e2e30124c0] Impossible to open
'temp/concat.txt#voiceover #funny #fall #lol.mp4' index.js:19
temp/concat.txt : No such file or directory

  


  


  And here is the contents of concat.txt, standard ffmpeg concat demuxer format :

  


  file '#voiceover #funny #fall #lol.mp4'
file 'part 2 repost 🙄 #fyp #funny @jordond262 @princemoonjq add my snap heroicdw333.mp4'
file 'This is my hair wet wet WOAHHH #GrowUpWithMe #fyp #foryoupage #love #funny #puppy #goldenretriever #cute #dog #wetwet.mp4'
file 'POV calling your friends when your 90#FootlongShuffle #GhostMode #funny #grandma  #fyp #halloween #collegegotmelike #tiktok #foryoupage.mp4'
file 'Sam Ki Singing Kaisi Lgi 😂😜 insta-samayranarula #foryou #trending #lockdown #queen_samayra #tiktokindia #funny #gharbaithoindia 🏠 #comedyindia.mp4'
file 'Reply to @juswa646  #fyp#funny #relatable.mp4'
file 'RaNdOm ViDeOs! #fy #fypシ #viral #meme #funny #xyzbca #funnyvideos #randomvideo.mp4'
file 'Reply to @bratzdoll.maya what should I do next 🙄 #fyp #foryoupage #leethe4th #memes #tall #funny #lol.mp4'
file 'Part 2 #fyp #foryou #viral #foryoupageofficiall #funny #trending.mp4'
file 'Lmfao 😂 (via @danibreezy01) #lmao #lmfao #funny #cousins #family #fyp #foryou #foryoupage.mp4'
file 'When you are a clumsy kitty #trend #joke #Khaleesi #funny #kittensoftiktok #foryou #fyp #foryoupage #cute #catsoftiktok.mp4'
file 'Tag That Friend That Always Be Falling Asleep 😂 #foryou #funny #fail #nap #sleep #pennsylvania #SHEINcares #viral #trending #meme #memes #foryoupage.mp4'
file '#funny #funnyvideos #girlfriend #crzy #Birdshit.mp4'
file 'He forgot he was a dog.                #dog #fyp #talkingdog #cute #pet #funny.mp4'
file 'Bad Day #part1 #badday #falling #funny #memes #viral #jokes #comedy #trending #fyp #foryou #share #likes #us #uk #xyzbca  #epic #pourtoi #fail #wee.mp4'
file 'I think he got offended ( #catsoftiktok #fyp #funny #catlover #MyJob #yellow #foryoupage.mp4'
file 'They took OFF today 🐶🤠🐶 #joshbutlertv #roxyandremi #funny #comedy #dogs #viral #memes.mp4'
file 'Had to make sure momma was there #funny #fyp #raccoons #love #bff #foryoupage #ThisorThatSBLV.mp4'
file 'That\'s not how you get out... #mysterymakers #escaperoom #foryou #fyp #crazystory #friends #funny #crazy #teammate.mp4'


  


  The function throwing the exception.

  


  async function makeCompilation(paths, outPath) {
  for (const filePath of paths) {
    await fs.appendFile(
      "temp/concat.txt",
      `file '${path.basename(filePath).replace("'", "\\'")}'${os.EOL}`
    );
  }
  return new Promise((resolve, reject) => {
    ffmpeg("temp/concat.txt")
      .inputOptions(["-f concat", "-safe 0"])
      .outputOption("-c copy")
      .on("stderr", (line) => console.log(line))
      .on("end", async () => {
        await fs.rm("temp/concat.txt");
        resolve();
      })
      .save(outPath);
  });
}


  


• How to write a filter for ffmpeg that burn subtitles using a subtitle stream directly

  20 mars 2014, par Filimindji

  Let say I have an MKV with a video stream, an audio stream and a subtitles stream.

  I would like to burn this subtitle into my video directly from the subtitle stream.

  so far, this is my command line :

  ffmpeg.exe -i "MyMovie.mkv" -map 0:0 -map 0:1 -vf subtitles=sub.srt out.mkv

  So far so good. But, my subtitles are inside the movie and I need to extract them before. I used this :

  ffmpeg.exe -i "MyMovie.mkv" -f srt sub.srt

  But this operation is too long : 25 sec on my PC for a 2.5Go MKV. I need something faster because I need to start streaming the output to an app as soon as possible. (I did not mentioned the others command line arguments I used to achieve this streaming properly because my question is not about that.)

  I know it is not possible to get the stream directly like this :

  ffmpeg.exe -i "MyMovie.mkv" -map 0:0 -map 0:1 -vf subtitles=[0:s:0] out.mkv

  But this is something I would love.

  edit :

  But I already know this kind of command line do not exist. (But if I'm wrong, please, let me know.)

  Now, I would like to write this kind of filter myself, and compile ffmpeg with it.
  But I have no idea where to start.

  Can anyone help me to start ?

  Thank you