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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.

• How use FFMPEG to merege multiple audios and videos with delay and offset for any streams

  9 juillet 2020, par Morak

  I want to use FFMPEG to merge multiple audios and videos.

  


  Materials are :

  


  

  1. three short audio clips (S1.mp4, S2.mp4, S3.mp4) without video(files
only have audio stream),

  


  2. three video clips (V1.mp4, V2.mp4, V3.mp4) without sound(files only have video stream).

  


  


  I have start-time of all materials(i.e :

  


  start-time of "S1.mp4" is 0 sec...
start-time of "S2.mp4" is 1220.5 sec...
start-time of "S3.mp4" is 2500.12 sec...


  


  and

  


  start-time of "V1.mp4" is 15.22 sec...
start-time of "V2.mp4" is 853.99 sec...
start-time of "V3.mp4" is 2901.37 sec...)


  


  My goal is :

  


  Merge all videos and audios to single file with entering in their start time.

  


  The requirement is depicted like below(D=delay).

  


  D <—V1.mp4—> D <----------V2.mp4-------------> D <-V3.mp4->blank

  &#xA;

  <------------S1.mp4-----> D <-------S2.mp4—> D <-------S3.mp4------->

  &#xA;

  The command I use is as below, but it does not work as expected.

  &#xA;

  1st:prepare V.mp4(merging all videos) :

  &#xA;

  ffmpeg -itsoffset {OFFSET.V1} -i V1.mp4  -itsoffset {OFFSET.V2} -i V2.mp4  -itsoffset {OFFSET.V3} -i V3.mp4 -map 0:v -map 1:v -map 2:v -c:v copy V.mp4

  &#xA;

  2nd:prepare S.mp4(merging all audios) :

  &#xA;

  ffmpeg -i S1.mp4 -i S2.mp4 -i S3.mp4 -filter_complex "[0]adelay=0[aud1];[1]adelay=1220.5[aud2];[2]adelay=2500.12[aud3];[aud1][aud2][aud3]amix=3[a]" -map "[a]" -c:a copy S.mp4

  &#xA;

  final:merging V.mp4 with S.mp4 :

  &#xA;

  ffmpeg -i V.mp4 -i S.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy final.mp4

  &#xA;

  Any hint is appreciated !

  &#xA;

• Cannot include ffmpeg.exe using auto-py-to-exe

  4 avril 2024, par YYY

  I'm trying to generate an exe for my PyQT application that uses ffmpeg using auto-py-to-exe.

  &#xA;

  Within the application, there are calls to ffmpeg as an os command (like 'ffmpeg -i file ... output) .&#xA;As I have ffmpeg installed on my machine and accessible from the Windows Path, when I run the app exe on my machine, I don't have any issue.

  &#xA;

  However, when it's someone that doesn't have ffmpeg installed, he/she encounters an error like "'ffmpeg' is not recognized as an internal or external command, operal program or batch file"

  &#xA;

  I don't want to put ffmpeg within a folder of the app as I call local modules that already call ffmpeg as an os command.

  &#xA;

  I have tried first to add ffmpeg.exe as a file (as recommended in one stackoverflow post) and then as a binary but without success&#xA;

  &#xA;

  I've already tried with the configuration stated in this

  &#xA;

  Can anyone help me on this ?

  &#xA;

  EDIT N°2

  &#xA;

  It turns out that when I export the exe on my machine by including ffmpeg as a binary either with pyinstaller or auto-py-to-exe, the final exe doesn't recognize the ffmpeg command even if it's in the folder.

  &#xA;

  

  &#xA;

  However, I've tried the same configuration on another machine and it worked without any error.

  &#xA;

  I've tried to install another ffmpeg version and link this version on the final exe but without success

  &#xA;