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• FFMPEG - C# - Audio and Video out of sync on certain videos after concatenation

  10 décembre 2016, par iamanoob

  Hey guys I’ve been trying to make this work for a while now and I can’t seem to find how to make the audio/video synced after the concatenation, I’ve searched and tested some solutions but couldn’t get it working.

  Here is what I do right now, Everything is working but I must be doing something wrong.

  So First, I split the videos into the video that I want

  System.Diagnostics.Process.Start(ffmpegPath, "-i " + 
  
  video.Path + " -ss " + StartTime + " -t " + Duration + " " + video.Output);

  After "cutting/splitting" the videos that I want like I want, I tried concatenating the videos together ( using -safe 0 to use the absolute path, else it wasn’t working ) :

  System.Diagnostics.Process.Start(ffmpegPath, 
  
  "-f concat -safe 0 -i " + txtFile + " C:\\Downloads\\Build\\" + rdn.Next(0,1000) + ".mp4");

  After that , I’ve noticed the audio/video was sometime out of sync so I searched and found this

  so I decided to Pad all the videos after splitting them :

  System.Diagnostics.Process.Start(ffmpegPath, 
  
  "-i " + video.Output + " -af apad -c:v libx264 -shortest -avoid_negative_ts make_zero -fflags +genpts -report " + padding);

  and then building it again, but it ended up having the same audio desync.

  It’s my first time working with mp4s and with FFMPEG and I’m sure I’m missing something.

• ffmpeg - convert movie AND show original input (as a resized picture-in-picture, e.g., bottom-right corner) in the final output file

  3 octobre 2019, par raven

  this is my first post on this forum, so please be gentle in case I accidentally do trip over any forum rules that I would not know of yet :).

  I would like to apply some color-grading to underwater GoPro footage. To quicker gauge the effect of my color settings (trial-and-error, as of yet), would like to see the original input video stream as a PIP (e.g., scaled down to 50% or even 30%), in the bottom-right corner of the converted output movie.

  I have one input movie that is going to be color graded. The PIP should use the original as an input, just a scaled-down version of it.

  I would like to use ffmpeg’s "-filter_complex" option to do the PIP, but all examples I can find on "-filter_complex" would use two already existing movies. Instead, I would like to make the color-corrected stream an on-the-fly input to "-filter_complex", which then renders the PIP.

  Is that doable, all in one go ?

  Both the individual snippets below work fine, I now would like to combine these and skip the creation of an intermediate color-graded TMP output which then gets combined, with the original, in a final PIP creation process.
  Your help combining these two separate steps into one single "-filter_complex" action is greatly appreciated !

  Thanks in advance,
  raven.

  [existing code snippets (M$ batch files)]
  
  
  
  ::declarations/defines::
  
  set "INPUT="
  
  set "TMP="
  
  set "OUTPUT="
  
  set "FFMPG="
  
  set "QU=9" :: quality settings
  
  
  
  set "CONV='"0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 
  
  0 -1 0:0 -1 0 -1 5 -1 0 -1 0'"" :: sharpening convolution filter
  
  
  
  ::color-grading part::
  
  %FFMPG% -i %INPUT% -vf convolution=%CONV%,colorbalance=rs=%rs%:gs=%gs%:bs=%bs%:rm=%rm%:gm=%gm%:bm=%bm%:rh=%rh%:gh=%gh%:bh=%bh% -q:v %QU% -codec:v mpeg4 %TMP%
  
  
  
  ::PIP part::
  
  %FFMPG% -i %TMP% -i %INPUT% -filter_complex "[1]scale=iw/3:ih/3 
  
  [pip]; [0][pip] overlay=main_w-overlay_w-10:main_h-overlay_h-10" -q:v 
  
  %QU% -codec:v mpeg4 %OUTPUT%
  
  
  
  [/existing code]

• Init improvement : Don’t fail if Flash URL is null in normal include + init case. Instead, show note in debug input and wait for soundManager.setup() with url param, then treat as delayed init case. Improved experience if including , then trying to do setup() after DOM Ready (common jQuery case)

  9 septembre 2012, par Scott Schiller

  m script/soundmanager2-jsmin.js m script/soundmanager2-nodebug-jsmin.js m script/soundmanager2-nodebug.js m script/soundmanager2.js Init improvement : Don’t fail if Flash URL is null in normal include + init case. Instead, show note in debug input and wait for soundManager.setup() with url (...)