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• Decrypt or decode ultraviolet videos

  29 mai 2017, par argetlam5

  I was on Vudu because I have some Ultraviolet movies in my collection and I saw you could download them from their site for offline usage.

  The files on the computer from that download are an h264-2000.mp4 file and aac-256.mp4 file (along with a json subtitle file and some other meta data stuff). When I try to run them individually however nothing happens and when I try to convert to m4v with ffmpeg it fails.

  • Are these files encrypted so that only their video player can play it ?
  • Is there a way to combine all of these files that I’m just not aware of ?

  Vudu uses Adobe Air if that gives you any more information.

  Also, if it is encrypted, does that mean it’s illegal for me to try to be messing with these ? I thought since I bought the movie it would be fine to try. I know I could rip the movie with something like handbrake but the quality from Vudu & other Ultraviolet sites is really nice and my computer doesn’t have a bluray reader to try and rip from a bluray.

• FFmpeg screen blend mode turns image pink

  18 mai 2021, par IAmDamoSuzuki

  I'm having trouble using the screen blend mode. I'm trying to create a video delay/echo effects. I have things working fairly well, but whenever I try to use the screen blend mode I get a pink image. Other blend modes don't have this issue, but the screen mode is likely going to give me the best visual results.

  


  I see that someone else asked a similar question here, and the answers suggested converting to RGBa before doing the blends. I've tried this and it didn't work. Here's my code and ffmpeg info.

  


  ffmpeg -i sampleVideo.mov -c:v prores -profile:v 3 -filter_complex "split[dry][toEcho];[toEcho]setpts=PTS+0.2/TB[wet];[wet][dry]blend=all_mode=screen:all_opacity=1,format=yuv422p10le[out]" -map [out] sampleVideo_echo.mov


  


  ffmpeg info :

  


  ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/morgan/Movies/AVAA/TapeDamage01.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:05.16, start: 0.000000, bitrate: 3717 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 81:80 DAR 27:20], 3560 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : Apple Video Media Handler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler
File '/Users/morgan/Movies/AVAA/TapeDamage01_echo.mov' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 (h264) -> split
  format -> Stream #0:0 (prores)
Press [q] to stop, [?] for help
Output #0, mov, to '/Users/morgan/Movies/AVAA/TapeDamage01_echo.mov':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Stream #0:0: Video: prores (HQ) (apch / 0x68637061), yuv422p10le, 640x480 [SAR 81:80 DAR 27:20], q=2-31, 200 kb/s, 29.97 fps, 30k tbn, 29.97 tbc (default)
    Metadata:
      encoder         : Lavc58.54.100 prores


  


  Here's a sample of the input file :

  


  

  


  and here's the pink output

  


  

  


• How make video out of images on the fly when using Qt with C++ on Android & iOS

  3 août 2017, par Programist

  I am using Qt 5.9 on Android & iOS. I need to create an .mp4 video out of an std::vector of images that I have on main memory.

  First basic question :
  Which is the correct multimedia framework to choose which works both on android & iOS and the one that can work with Qt & C++ ?

  I learnt that gstreamer, ffmpeg & libvnc are some options. Firstly I want to know which is the correct option.

  Qt has an example here which uses ffmpeg but it looks quite naive since it saves all images on to the disk & then creates a video out of it.

  Second question :
  Is it possible to do the same on the fly by taking the images to encode from the main memory ?