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• How to edit video (cut some scenes) without increasing the video's size

  18 février 2016, par 123iamking

  [Introduction]

  I have a video : Input.mp4 - length : 29 min 6 sec - size : 120 MB

  I use Microsoft Movie Maker 2012 (Movie Maker is included in the Windows Essentials 2012 program suite), to cut some boring scenes and keep the cool scenes and I get the video : Output.mp4 - length : 15 min 22 sec - size : 155 MB.

  And it’s take a long time to create the Output.mp4 and the size is ridiculously increased. I can’t use this kind of software anymore, I need to create a new software to serve my purpose.

  [Question]

  Is there anyway with C# .Net to simply cut and merge video without increasing the video’s size and have to be fast ?

  [What I have tried]

  I intend to use ffmpeg to cut the clip and merge the clip and I found something about cut video here , but the console said something about "Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future." - should I still use this ?

  Should I use ffmpeg or there’s better way to do this.

• FFmpeg GIF dump & video slideshow errors

  27 avril 2017, par Techie Android

  I’m running Windows 10 and have the latest static 64bit nightly FFmpeg version. Here are my scripts, I’ve been trying to get them fixed but I can’t seem to get either to work.

  I have a GIF file named gif.gif that I need the frames dumped out of and named in this order : img000.png img001.png img002.png and so forth.

  ffmpeg -i "gif.gif" "%img%%03d.png"

  It’s error message is :

  [NULL @ 052857c0] Unable to find a suitable output format for ’C :\Users\username’
  C :\Users\username : Invalid argument

  This is where I need the individual frames to be encoded into a video file and get it to duplicate the frames necessary to make it a slideshow. It should copy each frame 150 times so that they will last for 5s each at 30fps.
  The filename is video maker.bat

  ffmpeg -i %img%%03d.png -framerate 1/5 -c:v libx264 -r 30 -pix_fmt yuv420p "output.mp4"

  It’s error message is :

  imgC :\myfilesdirectoryhere\video maker.bat3d.png : Protocol not found

• FFMpeg image sequence to video using VP9 encoder [migrated]

  29 janvier 2016, par user778968

  I’m trying to transcode mp4 to webm format in a lossless way. I tried two ways to do that.

  For that purpose, I extracted mp4 video to image sequences (png). Then, I converted image sequence(without changing any frame) to webm video with a lossless flag. But, when i extract webm video to image sequences and compared with the images that i extracted from mp4 video, i realized that PSNR values were not infinity. It changes from between around 53-55 dB.

  On the other hand, I directly transcoded mp4 to webm with a lossless flag. Then, I extracted image sequences from mp4 and webm format and compared PSNR values. This time i realized that PSNR values are infinity.

  Encoding image sequences to webm video with lossless flag is not actually lossless. Is this true or am i doing something wrong ?