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• OpenGL (GLEW) + FFMPEG + VS2010 release build

  6 décembre 2015, par rickhik

  Currently I am working on a application that uses OpenGL (GLEW) and FFMPEG (libav’s) in Visual Studio 2010. The GLEW libs are included as Additional Libraries. The libav is set via a header file with extern "c" and pragma comment lib.

  The application opens a OpenGL window which draws some quads with textures via FFMPEG. I want to use this application for my volunteer job at a TV station of a Childrens Hospital.

  The problem I have is building a release version of my project. When I am building a Debug version it all works fine. I get a OpenGL Window with the quads. When I change Debug into Release and start the Debugger, it gives me the message "entry point of procedure __GLEW_EXT_framebuffer_object not found in DLL avcodec-56.dll", which is a bit strange to me because of the fact that the GLEW is not part of the avcodec-56.dll ?

  I can solve this issue by going to the project settings -> Linker -> Optimization and switch References from Yes(/OPT:REF) to No(/OPT:NOREF). I start the debugger to build the solution and it works as well. Now when I go to the Release folder of the project and start the build executable, the OpenGL Window stays black without giving me an error message.

  I hope you guys can help me out.

  @michael-iv I saw you had a similar issue

• Trying to use openH264 as an alternative to libX264 in FFMPEG C project

  5 décembre 2015, par Tishu

  I have an application that transcodes a video frame by frame using FFMPEG and x264 encoder. I am looking to release this application but the licensing of x264 made me switch to using openh264 instead.

  I managed to compile everything smoothly (openh264 then FFMPEG with enable-openh264). I am now trying to correct the encoder setup in my C code as what worked for libx264 doesn’t work anymore. Unfortunately I found very limited C/C++ examples of FFMPEG/openh264, i would appreciate any link/hint.

  I am using the following code (dec_ctx is the AVCodecContext of the video I am decoding)

              enc_ctx->height = dec_ctx->height;
  
              enc_ctx->width = dec_ctx->width;
  
              enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
  
              /* take first format from list of supported formats */
  
              enc_ctx->pix_fmt = encoder->pix_fmts[0];
  
              /* video time_base can be set to whatever is handy and supported by encoder */
  
              enc_ctx->time_base = dec_ctx->time_base;
  
  
  
              enc_ctx->gop_size      = 120; /* emit one intra frame every twelve frames at most */
  
              enc_ctx->max_b_frames = 16;
  
              enc_ctx->scenechange_threshold = 0;
  
              enc_ctx->rc_buffer_size = 0;
  
              enc_ctx->me_method = ME_ZERO;
  
  
  
              enc_ctx->ticks_per_frame = dec_ctx->ticks_per_frame * ifmt_ctx->streams[i]->time_base.den * ifmt_ctx->streams[i]->r_frame_rate.num/ifmt_ctx->streams[i]->r_frame_rate.den;
  
              // Set Ultrafast profile. internal name for this preset is baseline
  
              av_opt_set(enc_ctx->priv_data, "preset", "placebo", AV_OPT_SEARCH_CHILDREN);

  I get the following errors in the output with the [OpenH264] tag :

  [OpenH264] this = 0x0000000019C126C0, Warning:bEnableFrameSkip = 0,bitrate can't be controlled for RC_QUALITY_MODE,RC_BITRATE_MODE and RC_TIMESTAMP_MODE without enabling skip frame.
  
  Output #0, mp4, to 'C:\Dev\temp\geoVid.mp4':
  
  Stream #0:0: Video: h264 (libopenh264), yuv420p, 720x480, q=2-31, 200 kb/s, 90k tbn, 180k tbc
  
  Stream #0:1: Audio: aac, 48000 Hz, stereo, fltp, 96 kb/s
  
  [OpenH264] this = 0x0000000019C126C0, Warning:Actual input framerate fAverageFrameRate = 0.000000 is quite different from framerate in setting 60.000000, please check setting or timestamp unit (ms), start_Ts = 0
  
  [OpenH264] this = 0x0000000019C126C0, Warning:Actual input framerate fAverageFrameRate = 0.000000 is quite different from framerate in setting 60.000000, please check setting or timestamp unit (ms), start_Ts = 0

  The output video file just plays black frames. Any hint or link to some doc would be appreciated. I have been trying to understand these errors but not too sure how to enable "skip frame" or why it is complaining about my input framerate (this is the same input as when I encode successfully with libx264)

• FFMPEG Always Show On New Window

  11 avril 2022, par Teguh.Saint

  Yesterday I tried to run an old version of ffmpeg, with new windows. everything works fine, and ffmpeg wants to run in the same command line window. but after i try the new version of ffmpeg, ffmpeg doesn't run in the same window. and that was not long, after appearing he immediately disappeared.
After that I decided to use the old version of ffmpeg, but it had the same effect and the result was the same.
Can anyone here give me a solution ? I only want ffmpeg to run on one command prompt window.

  


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