Recherche avancée

Sur d’autres sites (9790)

• Correctly Allocate And Fill Frame In FFmpeg

  14 avril 2022, par Michel Feinstein

  I am filling a Frame with a BGR image for encoding, and I am getting a memory leak. I think I got to the source of the problem but it appears to be a library issue instead. Since FFmpeg is such a mature library, I think I am misusing it and I would like to be instructed on how to do it correctly.

  



  I am allocating a Frame using :

  



  AVFrame *bgrFrame = av_frame_alloc();


  



  And later I allocate the image in the Frame using :

  



  av_image_alloc(bgrFrame->data, bgrFrame->linesize, bgrFrame->width, bgrFrame->height, AV_PIX_FMT_BGR24, 32);


  



  Then I fill the image allocated using :

  



  av_image_fill_pointers(bgrFrame->data, AV_PIX_FMT_BGR24, bgrFrame->height, originalBGRImage.data, bgrFrame->linesize);


  



  Where originalBGRImage is an OpenCV Mat.

  



  And this has a memory leak, apparently, av_image_alloc() allocates memory, and av_image_fill_pointers() also allocates memory, on the same pointers (I can see bgrFrame->data[0] changing between calls).

  



  If I call

  



  av_freep(&bgrFrame->data[0]);


  



  After av_image_alloc(), it's fine, but if I call it after av_image_fill_pointers(), the program crashes, even though bgrFrame->data[0] is not NULL, which I find very curious.

  



  Looking FFmpeg's av_image_alloc() source code, I see it calls av_image_fill_pointers() twice inside it, once allocating a buffer buff....and later in av_image_fill_pointers() source code, data[0] is substituted by the image pointer, which is (I think) the source of the memory leak, since data[0] was holding buf from the previous av_image_alloc() call.

  



  So this brings the final question : What's the correct way of filling a frame with an image ?.

  


• Correctly Allocate And Fill Frame In FFmpeg

  24 février 2016, par mFeinstein

  I am filling a Frame with a BGR image for encoding, and I am getting a memory leak. I think I got to the source of the problem but it appears to be a library issue instead. Since FFmpeg is such a mature library, I think I am misusing it and I would like to be instructed on how to do it correctly.

  I am allocating a Frame using :

  AVFrame *bgrFrame = av_frame_alloc();

  And later I allocate the image in the Frame using :

  av_image_alloc(bgrFrame->data, bgrFrame->linesize, bgrFrame->width, bgrFrame->height, AV_PIX_FMT_BGR24, 32);

  Then I fill the image allocated using :

  av_image_fill_pointers(bgrFrame->data, AV_PIX_FMT_BGR24, bgrFrame->height, originalBGRImage.data, bgrFrame->linesize);

  Where originalBGRImage is an OpenCV Mat.

  And this has a memory leak, apparently, av_image_alloc() allocates memory, and av_image_fill_pointers() also allocates memory, on the same pointers (I can see bgrFrame->data[0] changing between calls).

  If I call

  av_freep(&bgrFrame->data[0]);

  After av_image_alloc(), it’s fine, but if I call it after av_image_fill_pointers(), the program crashes, even though bgrFrame->data[0] is not NULL, which I find very curious.

  Looking FFmpeg’s av_image_alloc() source code, I see it calls av_image_fill_pointers() twice inside it, once allocating a buffer buff....and later in av_image_fill_pointers() source code, data[0] is substituted by the image pointer, which is (I think) the source of the memory leak, since data[0] was holding buf from the previous av_image_alloc() call.

  So this brings the final question : What’s the correct way of filling a frame with an image ?.

• Shared Hosting + Static FFMPEG + PHP (or other scripting language) == failure on finding codec

  7 juillet 2012, par Ethan Allen

  here is the following environment :

  1. 1and1 shared hosting (they do not have ffmpeg installed, all good)
  2. i built a static ffmpeg binary that does not require dynamic loading of shared libaries (i built this on an Ubuntu system)
  3. ffmpeg binary is fully accessible and is able to get access
  4. executing the same command terminal or executing a php/perl script via terminal works fine...however, both scripts through a browser/web request fails with the following :

      Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
      array
  
        0 => string 'ffmpeg version git-2012-07-06-6936111 Copyright (c) 2000-2012 the FFmpeg developers' (length=83)
  
        1 => string '  built on Jul  5 2012 23:04:34 with gcc 4.4.3' (length=46)
  
        2 => string '  configuration : —prefix=' /ffmpeg' —enable-gpl —enable-libfaac —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libtheora —enable-libvorbis —enable-libvpx —enable-libx264 —enable-nonfree —enable-version3 —enable-static —disable-shared —extra-libs=-static —extra-cflags=-static' (length=323)
  
        3 => string '  libavutil      51. 64.100 / 51. 64.100' (length=40)
  
        4 => string '  libavcodec     54. 33.100 / 54. 33.100' (length=40)
  
        5 => string '  libavformat    54. 15.100 / 54. 15.100' (length=40)
  
        6 => string '  libavdevice    54.  1.100 / 54.  1.100' (length=40)
  
        7 => string '  libavfilter     3.  0.101 /  3.  0.101' (length=40)
  
        8 => string '  libswscale      2.  1.100 /  2.  1.100' (length=40)
  
        9 => string '  libswresample   0. 15.100 /  0. 15.100' (length=40)
  
        10 => string '  libpostproc    52.  0.100 / 52.  0.100' (length=40)
  
        11 => string 'Input #0, image2, from 'http://axiomchurch.co/main/wp-content/plugins/video-embed-thumbnail-generator/flash/skin/images/PlayNormal.png':' ; (length=136)
  
        12 => string '  Duration : 00:00:00.04, start : 0.000000, bitrate : N/A' (length=54)
  
        13 => string '    Stream #0:0 : Video : png, rgba, 100x100, 25 tbr, 25 tbn, 25 tbc' (length=66)
  
        14 => string '[graph 0 input from stream 0:0 @ 0x9482000] w:100 h:100 pixfmt:rgba tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2' (length=109)
  
        15 => string '[output stream 0:0 @ 0x948ccc0] No opaque field provided' (length=56)
  
        16 => string '[auto-inserted scaler 0 @ 0x948d160] w:100 h:100 fmt:rgba sar:0/1 -> w:100 h:100 fmt:yuvj420p sar:0/1 flags:0x4' (length=111)
  
        17 => string '[mjpeg @ 0x948c760] ff_frame_thread_encoder_init failed' (length=55)
  
        18 => string 'Output #0, image2, to '/homepages/17/d411786663/htdocs/main/wp-content/uploads/2012/07/ffmpeg_exists_test%d.jpg' :' (length=113)
  
        19 => string '    Stream #0:0 : Video : mjpeg, yuvj420p, 100x100, q=2-31, 200 kb/s, 90k tbn, 25 tbc' (length=83)
  
        20 => string 'Stream mapping :' (length=15)
  
        21 => string '  Stream #0:0 -> #0:0 (png -> mjpeg)' (length=36)
  
        22 => string 'Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height' (length=119)
  

  The command being executed :

   /kunden/homepages/17/.../htdocs/bin/ffmpeg -i http://....co/main/wp-content/plugins/video-embed-thumbnail-generator/flash/skin/images/PlayNormal.png -ac 2 /homepages/17/.../htdocs/main/wp-content/uploads/2012/07/ffmpeg_exists_test.jpg

  You can see i have the full path of my ffmpeg binary and that it is executing. Here is what it looks like successfully via terminal :

      ffmpeg version git-2012-07-06-6936111 Copyright (c) 2000-2012 the FFmpeg developers
  
        built on Jul  5 2012 23:04:34 with gcc 4.4.3
  
        configuration : —prefix=' /ffmpeg' —enable-gpl —enable-libfaac —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libtheora —enable-libvorbis —enable-libvpx —enable-libx264 —enable-nonfree —enable-version3 —enable-static —disable-shared —extra-libs=-static —extra-cflags=-static
  
        libavutil      51. 64.100 / 51. 64.100
  
        libavcodec     54. 33.100 / 54. 33.100
  
        libavformat    54. 15.100 / 54. 15.100
  
        libavdevice    54.  1.100 / 54.  1.100
  
        libavfilter     3.  0.101 /  3.  0.101
  
        libswscale      2.  1.100 /  2.  1.100
  
        libswresample   0. 15.100 /  0. 15.100
  
        libpostproc    52.  0.100 / 52.  0.100
  
      Input #0, image2, from 'http://axiomchurch.co/main/wp-content/plugins/video-embed-thumbnail-generator/flash/skin/images/PlayNormal.png':
  
        Duration : 00:00:00.04, start : 0.000000, bitrate : N/A
  
          Stream #0:0 : Video : png, rgba, 100x100, 25 tbr, 25 tbn, 25 tbc
  
      [graph 0 input from stream 0:0 @ 0x9482000] w:100 h:100 pixfmt:rgba tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
  
      [output stream 0:0 @ 0x948ccc0] No opaque field provided
  
      [auto-inserted scaler 0 @ 0x948d160] w:100 h:100 fmt:rgba sar:0/1 -> w:100 h:100 fmt:yuvj420p sar:0/1 flags:0x4
  
      Output #0, image2, to '/homepages/17/d411786663/htdocs/main/wp-content/uploads/2012/07/ffmpeg_exists_test.jpg' :
  
        Metadata :
  
          encoder : Lavf54.15.100
  
          Stream #0:0 : Video : mjpeg, yuvj420p, 100x100, q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
      Stream mapping :
  
        Stream #0:0 -> #0:0 (png -> mjpeg)
  
      Press [q] to stop, [?] for help
  
      frame=    1 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.04 bitrate=   0.0kbits/s    
  
      video:2kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000000%
  

  The user running the script at terminal AND the apache user are the same user...i have verified this.

  Something about the environment apache is running through is killing me...i dont have access to apache error logs unfortunately.

  As a side note...i am trying to utilize the Video Embed & Thumbnail Generator for wordpress.

  Any help appreciated, thanks !