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• Creating screenshot/image from Twitch stream

  22 juillet 2015, par danL

  I’ve messed around with FFmpeg some time ago and remember using it to fetch preview images for video files. My question is, is this the correct path to be going down for the purpose of getting images from a Twitch live stream ? What I need to do is get a screenshot of the end of a Twitch stream (the final scoreboard in a video game) and save that screen shot.

  I’m pretty sure I could get the code written, but I want to make sure there isn’t a better way of accomplishing this task because it seems like it would have gotten easier over the years. If there are any other libraries/APIs that would be more efficient than executing FFMpeg all the time.

  I hope there’s been some improvement in PHP video handling, but I’ve searched around and can’t find anything.

• Capture video using FFmpeg in Android

  3 juillet 2015, par Robert Miller

  I’ve made a simple camera app just to learn how to capture video on an Android device. The clip is currently recorded with the help of the MediaRecorder library. A preview is shown in a VideoView before recording starts, and continues to show this during the actual recording.
  As I have understood, recording of videos can also be done by creating an Intent and calling an external Activity, which would result in the previous activity to be paused and destroyed (correct ?).

  Anyways, for this project I prefer the first approach, to not leave the activity. But unfortunately, I experience issues with the MediaRecorder library due to a known bug (which by the way seems to have been around for years). So now I have come across FFmpeg and this "TouchToRecord" (link below) demo project that uses FFmpeg Recorder from JavaCV to capture videos by touching the screen. Awesome ! Except that I do not want to start the camera as a new activity, as they do in this example. I want to remain in the same activity and see the preview and record in a VideoView directly. To touch the VideoView to record isn’t necessary.
  Do you think it’s possible to use the same library (JavaCvVideoRecorder), as the creator of this demo project have been using, to do this ? Or is there a better way which I have not yet discovered ?

  In the end, all I want to do is being able to record video directly into a VideoView, without using the MediaRecorder library.

  Link to demo project : https://github.com/sourab-sharma/TouchToRecord

• Join a series of mp4 files using ffmpeg following a pattern in filenames

  26 juin 2015, par Slabo

  I’m trying to join a series of generated mp4 files with the filenames in the following order>>

  Vid1.mp4,Vid1s.mp4,Smiley.mp4,Vid2.mp4,Vid2s.mp4,Smiley.mp4, ..... VidN.mp4,VidNs.mp4,Smiley.mp4

  where the pattern is A1,A1s,C,A2,A2s,C .... AN,ANs,C ... where N is the half the number of files in the folder.. File names are actually in a format similar to AN.mp4 and ANs.mp4

  I know it’s going to be something like : :

  ffmpeg -f concat -i some regex -c copy FinalVid.mp4

  I used to know this stuff 10 years ago... ok, 9 years ago..

  Edit : Ok, so after trying to fix this myself, I can better describe the problem as follows

  if two files Vid-N.mp4 and Vid-Ns.mp4 exist, then should be appended to FinalVid.mp4. How do I solve this ? Just thinking out loud: :

  1. get list of mp4 files
  2. for every two pairs of files, append to
     FinalVid.mp4

  Any help appreciated, thanks.