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• Cannot find configure.ac file in ffmpeg

  23 février 2014, par Sudheesh

  Where can I find the configure.ac file of ffmpeg?. I downloaded the latest version of ffmpeg from git, but couldn't find the configure.ac ( input for autoconf ).

  I am in the process of adding a new proprietary media encoding/decoding in ffmpeg. I plan to enable it via --enable-mylib ( like libfaac ). Hence the question.

• Streaming webcam/video file from android device(Akash Tablet here) to rtmp server (RED5)

  22 février 2014, par Dev

  i am using ffmpeg for video streaming from android device to rtmp server red5 (ubuntu , and eclispe IDE for android programming). in my previous project simply i used commands of ffmpeg for video streaming and webcam streaming , in that project i was using window-7 and netbeans IDE , i was sending file from one desktop to another using red5 server, and same for webcam streaming , simply can i say i developed a video conferencing system (web-based, using window-7). now same thing i want for android platform. i want to send video fileand webcam capture video , from my android device to red5 srever. simply i want to develop a app for android - a video conferencing system , this is my project in my college. but here in this task i am facing many problems using ffmpeg, i can not use ffmpeg commands here i think. i am using android SDK and NDK/JNI , eclipse IDE ..plese suggest me how to use ffmpeg in android platform , thanks

• What is legacyNullReferencePolicy ?

  22 février 2014, par Sugrue

  We are getting mysterious SEHExceptions in our C# application which may be coming from some unmanaged code (FFMPEG). Its not being caught by the try-catch blocks - so we are not certain what is causing it, but it is perhaps due to a null reference.

  I found this on MSDN (SEHException MSDN Page) which says:

  The .NET Framework often encounters unmanaged SEH exceptions that are automatically mapped to managed equivalents. There are two common unmanaged SEH exceptions: STATUS_NO_MEMORY exceptions are automatically mapped to the OutOfMemoryException class. STATUS_ACCESS_VIOLATION exceptions are automatically mapped as follows:

  If legacyNullReferencePolicy is applied, all access violations are mapped to the NullReferenceException class.

  Now, this bit sounds interesting - if we could set this legacyNullReferencePolicy maybe these mysterious NullReferenceExceptions could be caught and we could find out where they are coming from.

  But I can't find any information online about legacyNullReferencePolicy. What is it? Where do I set it?

• What kind of ogg does Android Chrome support ?

  22 février 2014, par Nathan

  I've found that I can only play some ogg vorbis files in Android Chrome. Most notably, I cannot play the ogg files generated by Mauz Kahn's demo here: https://www.webrtc-experiment.com/ffmpeg/wav-to-ogg.html I used his demo to create some test ogg files using Windows Chrome and I could play them back while I was using Window's Chrome, but I could not play those same audio files in Android Chrome. I've played other ogg vorbis files in Android chrome so I suspect there is a subtle issue in the parameters that Khan's demo invokes ffmpeg with.

• trim MULTIPLE .mp4 files using ffmpeg in WINDOWS DOS

  22 février 2014, par user1530322

  My goal is to trim the first 4 seconds of, say 100 .mp4 files at once.

  I can easyly do it and in a quite quick way for one single .mp4 file at a time using:

  **ffmpeg -i MYFILE.mp4 -ss 00:00:04.000 -c:v copy -c:a copy Trimmed_MYFILE.**mp4

  I have a folder with those 100 mp4 files and want to bulk trim the first 4 seconds and save the new files on a folder in the same location called "newfiles".

  I'm imagining something like a loop, using FOR or so, but have no ideia how to do it.

  Thank you in advanced