Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• FFmpeg video to still images and back to video lossless

  28 novembre 2012, par Rigoni

  I'm trying to extract an image from an uncompressed AVI video using FFmpeg with the command:

  ffmpeg -i sorce.avi -f image2 -pix_fmt bgr24 images/%1d.bmp
  

  All is okay, but now I need to convert these images back to a video file.
  I'm trying using this command:

  ffmpeg -f image2 -r 24 -i marked/%1d.bmp -y -vcodec ffv1 -pix_fmt bgr24 test.avi
  

  But the output video is compressed and poor quality.

  Is there any way to extract the images in RGB format and than back to a lossless video?

  I also tryed to use -vcodec rawvideo, but the quality still bad.

• How to distinguish end of stream from other errors in Xuggler's readNextPacket() method ?

  28 novembre 2012, par Dims

  How to distinguish end of stream from other errors in IContainer.readNextPacket(IPacket packet)?

  I can distinguish thread interrupt with IError.make(int), but other errors tagged as "unknown".

  May be the only reading error is EOF?

• Looking for method to combine images to make a video through phonegap platform for android and ios

  28 novembre 2012, par Pat

  I'm looking to write an application that could combine images and then to form a video. I'm working with Phonegap framework to be available for use on Android and IOS.

  My question is what sort of process is involved to achieve this?

  At this stage I've tried to read about ffmpeg, most of the questions existing on stackoverflow talk of having to get the source, compiling to make a series of libraries for use. With those libraries it needs to be tied in with the Android/IOS libraries? (I notice there is an 'android.jar' with the project file in eclipse. Would it exist in there?) Afterwards my confusion lies with how is this implemented into Phonegap. Develop a plugin?

  Just to add, libav according to wiki, has hardware accelerated H.264 decoding whilst using x.264 for encoding for Android. How does that work? Is this something accessed from libav libraries and then have to compiled in within the android.jar?

  I may have confused terms in trying to describe what I do not know.

  Any help would be appreciated.

• How YouTube identifies if a movie is shaky [closed]

  28 novembre 2012, par MollyRazor

  After uploading a movie to Youtube, it analyzes the movie and if it's shaky, then it gives the option to correct it. The correction works with ffmpeg, but is there any open source method to analyze whether a movie is shaky?

  I can't understand StackOverflow moderators. This place is full of self righteous bastards.

  Mr. Moderator says in a comment: ffmpeg is open source. O REALLY? Then what parameters to use so ffmpeg outputs => yes, this is a shaky movie or no, this isnt. Ah, you can't answer that, so you close this question.

  Have you even read the question thoroughly? Then do so again please. I think by the age of 50 you can correctly interpret what was written and what the question was.

  Thank you.

• Write video in a memory stream using libav

  28 novembre 2012, par Dídac Pérez

  I am successfully capturing video packets from the network using libav. Currently, I have an AVFormatContext object in which I can write the header, the packets, etc... The point is that I want to dump everything on this context into a file when required. What should I do ?

  Thanks in advance, Dídac Pérez