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• What option controls whether GLSLang gets built in FFmpeg ?

  10 février 2023, par TigerhawkT3

  I'm using Media Autobuild Suite to build a more comprehensive FFmpeg executable for Windows than what's available in binaries distributed online, but I've encountered issues. I've resolved errors in a couple libraries by skipping them (commenting them out in ffmpeg_options.txt), but I'm stuck on the GLSLang module (OpenGL Shader Language). I've already disabled it and OpenGL in ffmpeg_options.txt as well as other switches labeled "options that add shared dependencies," and the suite is still trying to build it.

  


  Disabled options :

  


  #--enable-fontconfig
#--enable-libmfx
#--enable-decklink
#--enable-librist
#--enable-librtmp
#--enable-libssh
#--enable-libtesseract
#--enable-vapoursynth
#--enable-liblensfun
#--enable-libglslang
#--enable-vulkan
#--enable-opencl
#--enable-opengl
#--enable-cuda-nvcc
#--enable-libnpp
#--enable-libopenh264


  


  The failed build generates an entire folder of logs, but here's the error message that prints in the console :

  


    Running git clone for glslang...
  Running git update for glslang...
┌ glslang git  ........................................ [Recently updated]
├ Running dependencies...
Likely error (tail of the failed operation logfile):
CPPFLAGS: -D_FORTIFY_SOURCE=0 -D__USE_MINGW_ANSI_STDIO=1
CFLAGS: -mthreads -mtune=generic -O2 -pipe
CXXFLAGS: -mthreads -mtune=generic -O2 -pipe
LDFLAGS: -pipe -static-libgcc -static-libstdc++
/usr/bin/python ./update_glslang_sources.py
/usr/bin/python: can't open file '/build/glslang-git/./update_glslang_sources.py': [Errno 2] No such file or directory
dependencies failed. Check C:/mab_suite/build/glslang-git/ab-suite.dependencies.log
This is required for other packages, so this script will exit.
  Creating diagnostics file...

Attach C:\mab_suite\build\logs.zip to the GitHub issue.
Make sure the suite is up-to-date before reporting an issue. It might've been fixed already.

Try running the build again at a later time.


  


  What modules/libraries do I have to fix or skip to prevent this error from causing the build to fail ?

  


• Can FFMPEG be used to change the transparency of a single PNG ?

  19 juillet 2020, par Chameleon

  I know that FFMPEG can manipulate transparency using fade in/fade out over a series of frames. I just haven't found a way to generate a png with a specified transparency setting.

  


  I am in the process of creating a lot (20 in first set) of procedurally-generated videos. Each video requires several starts and stops, where with each stop, a png overlay describing what is seen will be displayed for several (actual number TBD, and may vary) frames. I'd like each overlay to fade in over x frames, display for y frames at full opacity and then fade out over y frames. The documentation on FFMPEG really sucks at explaining fade effects, and no one I've found showing usage actually explains what all of the parameters do.

  


  The original sources for the videos are CGI png frames with a transparent background. I will be making the descriptive overlays with transparent backgrounds (same resolution as the CGI frames) - I'm really hoping to not have to manually save each overlay (8 overlays per video at a minimum) with 4 to 6 (or more) transparency settings - The company is being real indecisive as to the length of the fade in/out or the "hang time" of the descriptive overlays.

  


  I have already created a Python script that uses FFMPEG to place overlays on specific frames, then uses FFMPEG to stitch all frames into a single video, adds a background to the video and then places the company's watermark on the video. It already manages the key frames and what images should be overlaid (and for how many frames). It is working well, but the company doesn't like the lack of fade. I already have the framework in place to manage the fade in/out duration (I'm just missing the answer to this question). I created the script because I have no doubt that I'll have to generate the final output on the first couple of videos a number of times to appease the stakeholders.

  


  I'm really hoping to find a fairly easy way to hand FFMPEG a png with a transparent background and have FFMPEG hand me a copy of the image whose non-transparent part is now "x percent" transparent (or "y percent" opaque). I know from failed attempts that FFMPEG doesn't choke trying to make a region more than 100% transparent.

  


  It's a real pain to get approval to install new software on the workstation, so I'm not actually interested in any suggestion that doesn't use FFMPEG or a pretty vanilla Python installation. - It's not that the other software might not be useful, it just means that if other software is needed, I'll have to manually create the frames.

  


• FFMPEG - Scrambled Output converting from VOB with ffmpeg

  24 décembre 2013, par MattD

  I've concatenated a series of VOB files from a DVD into a single VOB file and I am trying to convert it to MP4 or other similar format. I see a lot of errors when converting and the output appears scrambled.

  >ffmpeg.exe" -i file.vob -sameq file.mp4
  
  FFmpeg version git-N-29181-ga304071, Copyright (c) 2000-2011 the FFmpeg develope
  
  rs
  
    built on Apr 18 2011 21:24:03 with gcc 4.5.2
  
    configuration: --enable-gpl --enable-version3 --enable-runtime-cpudetect --ena
  
  ble-memalign-hack --enable-avisynth --enable-bzlib --enable-frei0r --enable-libo
  
  pencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --
  
  enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger
  
   --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enabl
  
  e-libx264 --enable-libxavs --enable-libxvid --enable-zlib --cross-prefix=i686-w6
  
  4-mingw32- --target-os=mingw32 --arch=x86_32 --extra-cflags=-I/home/kyle/softwar
  
  e/ffmpeg/external-libraries/win32/include --extra-ldflags=-L/home/kyle/software/
  
  ffmpeg/external-libraries/win32/lib --pkg-config=pkg-config
  
    libavutil    50. 40. 1 / 50. 40. 1
  
    libavcodec   52.120. 0 / 52.120. 0
  
    libavformat  52.108. 0 / 52.108. 0
  
    libavdevice  52.  4. 0 / 52.  4. 0
  
    libavfilter   1. 79. 0 /  1. 79. 0
  
    libswscale    0. 13. 0 /  0. 13. 0
  
  [mpeg2video @ 01751A90] ac-tex damaged at 5 16
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 1
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 2
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 3
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 4
  
  
  
  [...]

  I'm guessing this is CSS scrambling and I need to do some sort of DeCSS. Does FFMpeg have an option for this ? Cringe if you'd like, but is there C# source to achieve this ?

  My end goal is really just to get some DVDs that I own onto my media server. I've tried a few demo-ware products with limited success including Acala DVD Ripper, Click to Disk, AVIDemux to name a few. I even paid for a couple of them to get the full version, but Acala only works for about half of my DVDs and Click to Disk can decode the VOB, but I need to use FFMpeg to convert. I'd like to have it all in one app that works and I am willing to write some code for it.