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• How to get iOS App Preview video bitrate in range

  29 avril 2019, par JKaz

  Creating new App Previews for App Store Connect has always been difficult. Time to do it again (new app version) and running into same issue without resolution this time.

  Making the video is easy enough, recording it with Quicktime and either a connected device or through Simulator (and the xcrun simctl io booted recordVideo <filename>.<file extension="extension"></file></filename> Terminal command).

  I can open that in iMovie, create a new App Preview, and export/share the preview with proper size, length, frame rate per Apple specs. But the bit rate is always too low ( 4 mbps) and it’s required to be 10-12 mbps (and I’ve had video reject be/c of that). In the past I could always make some change to the .mp4, in conjunction with something like ffmpeg -i ~/appVideo.mp4 -b:v 11M ~/appPreview.mp4 to get the file into the target range, but that’s not helping today, and neither is Developer Tech Support.

  Apple’s documentation says :

  To export the final video, click Share in the toolbar, then choose App
  Preview. The export settings are automatically configured to meet App
  Store requirements. iMovie exports the final video at the correct
  resolution based on the device from which your clips were captured.

  I’ve done that and more, and bit rate is still out of range (every other attribute is in spec). I’ve tried the recommendations from a bunch of other threads here for http://video.online-convert.com/convert-to-mp4 and others, and none seem to do the trick. Am I missing something obvious re bitrate ? Is it this hard for everyone ?

  Thank you.

• Xcode with ffmpeg support

  5 octobre 2013, par user2741735

  I wanted to know the procedure for compiling the xcode project with ffmpeg with special ./configure options and the gas-processor. I'm using direct input from IP Camera and storing it on my hard drive. However I'm doing this on terminal with ffmpeg. I want to do the same operations using code on xcode. Need help for that.

  I have heard that Apple doesn't support ffmpeg for ios apps on AppStore. Is it true ?

• My FFMPEG converter is not allowing mp4 to webm conversions.

  2 novembre 2016, par Fred Garbutt

  heres the command :

  ffmpeg -i videos/test.mp4 -c:v libvpx -level 216 -profile 0 -qmax 42 -qmin 10 -c:a libvorbis -f webm out.webm

  i keep getting this error :

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  here is the full response

  # ffmpeg -i videos/test.mp4 -c:v libvpx -level 216 -profile 0 -qmax 42 -qmin 10 -c:a 
  
  
  
  libvorbis -f webm out.webm
  
  ffmpeg version N-49225-g7e059c9 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jan 24 2013 05:14:06 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-54)
  
    configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl --enable-postproc --enable-nonfree
  
    libavutil      52. 15.101 / 52. 15.101
  
    libavcodec     54. 90.100 / 54. 90.100
  
    libavformat    54. 61.104 / 54. 61.104
  
    libavdevice    54.  3.102 / 54.  3.102
  
    libavfilter     3. 33.100 /  3. 33.100
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/test.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      creation_time   : 2010-08-12 15:42:21
  
    Duration: 00:00:34.20, start: 0.000000, bitrate: 358 kb/s
  
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 100 kb/s
  
      Metadata:
  
        creation_time   : 2010-08-12 15:42:21
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x320, 251 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc
  
      Metadata:
  
        creation_time   : 2010-08-12 15:42:21
  
        handler_name    : Apple Video Media Handler
  
  Please use -profile:a or -profile:v, -profile is ambiguous
  
  File 'out.webm' already exists. Overwrite ? [y/N] y
  
  v0.9.6
  
  [libvpx @ 0x7e38d20] Failed to initialize encoder: ABI version mismatch
  
  Output #0, webm, to 'out.webm':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      Stream #0:0(eng): Video: vp8, yuv420p, 640x320, q=10-42, 200 kb/s, 90k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 2010-08-12 15:42:21
  
        handler_name    : Apple Video Media Handler
  
      Stream #0:1(eng): Audio: none, 44100 Hz, stereo, fltp
  
      Metadata:
  
        creation_time   : 2010-08-12 15:42:21
  
        handler_name    : Apple Sound Media Handler
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 -> libvpx)
  
    Stream #0:0 -> #0:1 (aac -> libvorbis)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  does anybody have any idea whats going on ? I am completely lost. I have tried so many different commands. converting from mp4 to ogg works fine, and i have had mp4 to webm working before, but i reinstalled ffmpeg to get the mp4 to ogg working and now ive lost my mp4 to webm conversions. >.< this whole installation process is such a damn nightmare. does anyone havea good tutorial for centos installation of ffmpeg that will work for mp4 ogg and webm ? I have used the centos tut that came off of the ffmpeg site, but it failed me. If anyone has any ideas that could point me in the right direction i would much appreciate it !