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• How do I get the duration of the codec video file that prefix .264 using the FFmpeg library ?

  16 août 2018, par lscodex

  I use FFmpeg library for android ndk. There is no problem when I run .mp4 format video. Actually, I play the video file that has the .264 suffix. However, when I run .264 format video, the code returns a negative number like that -232132.

  this is code :

  extern "C"
  
  JNIEXPORT jint JNICALL
  
  Java_com_lscodex_just_videoplayertesting2_H264Decode_getDuration(JNIEnv *env, jobject instance) {
  
  
  
    AVFormatContext *formatContext = gvs->pFormatCtx;
  
  
  
      if (NULL != formatContext) {
  
  
  
  
  
           int durations = static_cast<jint>(formatContext->duration / AV_TIME_BASE);
  
           logd("VIDEO DURATION ---> %d", durations);
  
           return durations;
  
       } else {
  
           return -1;
  
       }
  
  }
  
  </jint>

  the output is VIDEO DURATION ---> -2077252342

  Do you have any suggestions for me ?

• Revision 08348d9cab : prefix vp8 asm_{com,dec,enc}_offsets files make them symmetrical with the gener

  2 mars 2013, par James Zern

  Changed Paths : Modify /build/make/Android.mk Modify /build/make/Makefile Modify /build/make/obj_int_extract.c Modify /build/x86-msvs/obj_int_extract.bat Delete /vp8/common/asm_com_offsets.c Add /vp8/common/vp8_asm_com_offsets.c (from /vp8/common/asm_com_offsets.c (...)

• How to "filter" a file through command line before apache sends it to client ?

  1er septembre 2020, par Timothe Jahan

  I have large collection of video files which are available on our website.
For each video we have multiple quality and language, so in order to save space we store only 1 file, which contains all audio and video tracks.

  


  Our streaming server can handle these multitrack files in order to serve only the useful part to each user, but we also make them available for download through the apache web server.
Currently, when a user request a file (certain quality, certain language), we first create a temporary file with only his needs, and give him for download.
I would like to remove this intermediate step and extract on the fly.
Extraction can be done by ffmpeg, but I need to have apache "pipe" the file through ffmpeg before sending the bytes out. Do you have any way of doing this.

  


  example :

  


  


  Filename_multi.mp4 [SD,HD,fr,en,ru]
User request : Filename_HD_fr.mp4 [HD,fr]
Apache fetch the file Filename_multi.mp4 and pipe it through an ffmpeg command and send the bytes as > they are encoded, not waiting for the end.

  


  


  Note this is on linux, and the ffmpeg part is not a problem.

  


  Thx
Timothé