Newest 'ffmpeg' Questions - Stack Overflow

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• Compiling ffmpeg with mingw + libx264

  31 janvier 2012, par Pat

  I'm installed most necessary components to build ffmpeg and x264. Here's the process:

  Launched msys, went ahead and moved the x264 source folder, ran the following configure with make and make install after:

  ./configure --enable-static --enable-shared --enable-win32thread
  

  Worked like a charm, had my .dll's, the .a link file.

  Moved over to ffmpeg's folder, downloaded the source from zeranoe's build website, ran the following procedure:

  export CPPFLAGS="$CPPFLAGS -IC:/MinGW/msys/1.0/local/include"
  export LDFLAGS="$LDFLAGS -LC:/MinGW/msys/1.0/local/lib" 
  ./configure --enable-shared --enable-decoder=h264 --enable-w32threads --enable-gpl --enable-libx264 --extra-libs=C:/MinGW/msys/1.0/local/lib/libx264.a --extra-cflags=-IC:/MinGW/msys/1.0/local
  

  I do the make, and it fails after 5 minutes: http://pastie.org/3290141

• Is it possible to stream mp3 playlist file with ffmpeg ?

  31 janvier 2012, par faridv

  I have playlists for mp3 files stored in mysql database, so I can create any kind of plalist file (m3u, xml, etc.). I need a program to stream these mp3 files on Internet. Streaming type is not that important, it can be rtp, udp or whatever, it's supposed to play with JWPlayer. How can I do this with FFMPEG or VLC or any other free softwares?

• How to mirror swscale PIX_FMT_YUYV422

  31 janvier 2012, par superg

  I'm trying to mirror libswscale PIX_FMT_YUYV422-type image horizontally. Using simple loop for each line with 16-bits per pixel results in having colors wrong, for example blue objects are orange. Here is my code:

     typedef unsigned short YUVPixel; // 16 bits per pixel
      for (int y = 0; y < outHeight; y++)
      {
          YUVPixel *p1 = (YUVPixel*)pBits + y * outWidth;
          YUVPixel *p2 = p1 + outWidth - 1;
          for (int x = 0; x < outWidth/2; x++) // outWidth is image width in pixels
          {
              // packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
              unsigned short tmp;
              tmp = *p1;
              *p1 = *p2;
              *p2 = tmp;
          }
      }
  

  Then I tried redefining YUVPixel as 32-bit type and modifying my loop accordingly. This results in correct colors, but looks like neighboring pixels are swapped. Any ideas, I'm totally lost with this?

• apache /etc/ld.so.conf path error

  31 janvier 2012, par user346443

  Hi I have just installed ffmpeg and am getting the following error:

  ./ffmpeg: error while loading shared libraries: libavfilter.so.1: cannot open shared object file: No such file or directory
  

  So I add the paths /usr/local/lib and /usr/local/bin to my /etc/ld.so.conf so it looks like:

  include ld.so.conf.d/*.conf
  /usr/local/lib
  /usr/local/bin
  

  Then run ldconfig -v and ffmpeg works successfully.

  My problem is when i add the paths to the /etc/ld.so.conf file all my perl sql modules stop working.

  How can I add the paths to the ld.so.conf file without disrupting the perl sql modules?

  Thanks in advance

  UPDATE : SOLUTION

  I removed the paths from /etc/ld.so.conf leaving just include ld.so.conf.d/*.conf then created a file /etc/ld.so.conf.d/ffmpeg.conf and added the paths to it. Ran ldconfig -v and i was good to go

• Perl FFMpeg print output

  31 janvier 2012, par user346443

  Hi im using the following perl command to convert files with ffmpeg:

  system ("/usr/local/bin/ffmpeg -i $inputFile $outputFile");
  

  I would like to know if its possible to print the ffmpeg output?

  Cheers

  UPDATE

  The solution was to use backticks

  my $output = qx{/usr/local/bin/ffmpeg -i $inputFile $outputFile 2>&1};
  print $output
  

  This prints out the following:

  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers built on Jan 31 2012 12:30:35 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6) configuration: --enable-libmp3lame --disable-mmx --enable-shared libavutil 50.36. 0 / 50.36. 0 libavcore 0.16. 1 / 0.16. 1 libavcodec 52.108. 0 / 52.108. 0 libavformat 52.93. 0 / 52.93. 0 libavdevice 52. 2. 3 / 52. 2. 3 libavfilter 1.74. 0 / 1.74. 0 libswscale 0.12. 0 / 0.12. 0 [wav @ 0x8af94c0] max_analyze_duration reached Input #0, wav, from 'a.wav': Duration: 00:00:05.84, bitrate: 1537 kb/s Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s Output #0, mp3, to 'a.mp3': Metadata: TSSE : Lavf52.93.0 Stream #0.0: Audio: libmp3lame, 48000 Hz, 2 channels, s16, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Press [q] to stop encoding size= 42kB time=5.42 bitrate= 64.0kbits/s size= 46kB time=5.88 bitrate= 64.0kbits/s video:0kB audio:46kB global headers:0kB muxing overhead 0.070153%