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• Unable to open symbol file. Error (20) : Not a directory

  29 octobre 2015, par grzebyk

  I am using ffmpeg library on android to stream live video feed. I have complied ffmpeg for android following roman10 instructions. The application is working correctly - it connects to the server, download the feed, transcode it, rescale it and displays on the device’s screen. However after a certain random moment the app crashes with Fatal signal 11 (SIGSEGV), code 1. I have used ndk-stack to find the source of the problem. Here is the crash dump :

  ********** Crash dump: **********
  
  Build fingerprint: 'google/hammerhead/hammerhead:5.0.1/LRX22C/1602158:user/release-keys'
  
  pid: 25241, tid: 25317, name: AsyncTask #5  >>> com.grzebyk.streamapp <<<
  
  signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x98e74c9c
  
  Stack frame #00 pc 00047924  /data/app/com.grzebyk.streamapp-1/lib/arm/libswscale-3.so: Unable to open symbol file /Users/grzebyk/Documents/New_Eclipse_Projects/StreamApp/libs/armeabi/libStreamApp.so/libswscale-3.so. Error (20): Not a directory
  
  Stack frame #01 pc 00034be8  /data/app/com.grzebyk.streamapp-1/lib/arm/libswscale-3.so (sws_scale+2648): Unable to open symbol file /Users/grzebyk/Documents/New_Eclipse_Projects/StreamApp/libs/armeabi/libStreamApp.so/libswscale-3.so. Error (20): Not a directory

  My native code is located in the StreamApp.cpp file. For me it looks like the app is trying to access libswscale-3.so (part of the ffmpeg) located inside the libStreamApp.so. This seems weird for me…

  All the ffmpeg’s .so files are located in /libs/armeabi/lib*.so. Naturally this includes the "missing" libswscale-3.so. The most disturbing thing is a fact that the app is working perfectly, but it crashes suddenly and it does not need any specific trigger to do so.

  What can I do to either put libswscale-3.so inside labStreamApp.so or to avoid referencing one .so file from another ?

• sws_scale generates malformed video

  29 juillet 2024, par GiuTor

  I have to encode a series of frames from CAIRO_FORMAT_ARGB32 to AV_PIX_FMT_YUV420P with sws_scale. From the ffmpeg docs I came to know the AV equivalent of the source format is AV_PIX_FMT_ARGB so here is my code :

  


   // Set up conversion context
    img->sws_ctx = sws_getCachedContext(
        img->sws_ctx,
        img->video_size[0],
        img->video_size[1],
        AV_PIX_FMT_ARGB,
        img->video_size[0],
        img->video_size[1],
        AV_PIX_FMT_YUV420P,
        SWS_BILINEAR,
        NULL,
        NULL,
        NULL);

    width  = cairo_image_surface_get_width( surface );
    height = cairo_image_surface_get_height( surface );
    stride = cairo_image_surface_get_stride( surface );
    pix    = cairo_image_surface_get_data( surface );
    const int in_linesize[1] = { stride };
    
    sws_scale(  img->sws_ctx, (const uint8_t * const *) &pix, in_linesize, 0,
                img->video_size[1], img->video_frame->data, img->video_frame->linesize);
    img->video_frame->pts++;


  


  Sadly the video doesn't play and VLC shows a bunch of these useless messages :

  


  [h264 @ 0x7f6ce0cbc1c0] mmco: unref short failure
[h264 @ 0x7f6ce0c39a80] co located POCs unavailable
[h264 @ 0x7f6ce0c82800] co located POCs unavailable
[h264 @ 0x7f6ce0c9f400] mmco: unref short failure


  


  The encoding process runs just fine. I also tried with const int in_linesize[1] = 3 * width  ; Where am I wrong ?

  


• 'ffmpeg' or 'handbrake cli' for video conversion on server ? [closed]

  18 juin 2013, par AaronJiang

  I want to convert videos on my server using command line, maily mp4 -> flv or flv -> mp4. I googled and found these two products 'ffmpeg' and 'HandBrake cli'.

  http://ffmpeg.org/ffmpeg.html

  https://trac.handbrake.fr/wiki/CLIGuide

  Which one is better ?

  Plus I am running on ubuntu server.