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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.

• Revision 20cf22a128 : Enforce effective motion vector search range This commit explicitly enforces th

  21 janvier 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_mcomp.c

  
  
  Enforce effective motion vector search range

  This commit explicitly enforces the effective motion vector range
  in the motion search stage. The range needs to be the intersection
  of UMV border, effective absolute motion vector value range, and
  the target search area.

  Change-Id : I1cf7c563e02b1086040dad6c1f4f6be1538635a6

• ffmpeg is cutting video length incorrectly

  1er mars 2018, par jameshwart lopez

  I use ffmpeg to check the length of the video and to cut video.

  I have a video with the lenght of 19.458333 seconds that’s why i want to cut it to only have 19 seconds because i don’t want the floating point.

  I check the video length using below command

  ffprobe -i "video.avi" -show_entries format=duration -v quiet -of csv="p=0"

  And I use below command to cut video the video

  ffmpeg -i  "video.avi" -ss 00:00:00 -t 00:00:19.000 -c copy out.mp4

  or

  ffmpeg -i  "video.avi" -ss 00:00:00 -t 19 -c copy output.avi

  The problem i have is when i cut the video with the above command and check the length the output file’s length is 19.018 seconds. Can someone help me with this problem ?