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• ffmpeg error - unknow error from vkcache m3u8

  18 juillet 2017, par Robert Smith

  Trying to download this stream to mp4 :

  http://f4h4he.vkcache.com/secip/0/Phhz9wn3_IawaUZtvvlVOw/NjguMjQxLjg3LjE1OQ==/1500346800/hls-vod-s1/flv/api/files/videos/2016/03/15/1458006491172bd.mp4.m3u8

  I am using the following command :

  ffmpeg -user-agent "Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us)" -i "http://f4h4he.vkcache.com/secip/0/Phhz9wn3_IawaUZtvvlVOw/NjguMjQxLjg3LjE1OQ==/1500346800/hls-vod-s1/flv/api/files/videos/2016/03/15/1458006491172bd.mp4.m3u8" -vcodec copy -acodec copy -bsf:a aac_adtstoasc output.mp4

  But am getting error from ffmpeg : "Unknown error"

  My question is what am I doing wrong or missing in the command ? Thanks.

  Here is an additional source of help I was using but did not help :

  https://forum.videohelp.com/threads/370243-download-video-from-hqq-tv

  Update #1

  I was able to retrieve the actual file :
  1458006491172bd.mp4.m3u8

  Here is the file :
  http://txt.do/dkyui

• How do I upscale an iOS App Preview video to 1080 x 1920 ? [closed]

  12 avril 2024, par Benjamin Thiel

  I just captured a video of my new app running on an iPhone 6 using QuickTime Player and a Lightning cable. Afterwards I created an App Preview project in iMovie, exported it and could successfully upload it to iTunes Connect.

  



  Apple requires developers to upload App Previews in different resolutions dependent on screen size, namely :

  



  

  • iPhone 5(S) : 1080 x 1920 or 640 x 1136

  


  • iPhone 6 : 750 x 1334 (what I have)

  


  • iPhone 6+ : 1080 x 1920

  


  



  Obviously, 1080 x 1920 is killing two birds with one stone. I know that upscaling isn't the perfect solution, but it's meeting my needs. Since I don't own a 6+, another recording session won't do the trick.

  



  Unfortunately, iTunes Connect is extremely picky about what to accept. Here's what I tried, to no avail :

  



  

  • Handbrake, iMovie, QuickTime do not support upscaling

  


  • MPEG Streamclip

  


  • ffmpeg -i input.mp4 -acodec copy -vf scale=1080:1920 output.mp4

  


  



  Strangely enough, iTunes Connect keeps complaining about the wrong resolution when I try to upload the output.mp4 of ffmpeg.

  


• time progress bar does not scale by sec in FFMPEG chopped mp4 in iOS and Android devices

  10 juillet 2017, par Xi Xiao

  I have used the below command to cut out a 44sec length video. The result video can be found here.

  ffmpeg -i friends.mkv -ss 00:15:30.0 -t 44 -vf scale=640:360  video.mp4

  One odd issue appears from the generated video.mp4.

  when playing it in iphone 7 and huawei honor8 android, the time progress bar does not scale by second.

  What I mean is, for example, the video can start to play either from 0 second or 6 second. But, if I drag the progress bar to time between 0 - 6, such as 4, the video player will jump to 0 and play, instead of playing from 4 second.

  When I use Javascript to setTime for 2 second for html5 video player, it does not work either, i.e. the player will play from 0 second instead of 2. Code is as below :

  var vid = document.getElementById("video1");
  
  vid.currentTime = 2;
  
  vid.play();

  screenshot made in iphone 7

  I stop the video, try set the progress bar between 0 and 6 as in screenshot. When I click play, the player will play from 0.

  

  In what devices have I tested it ?

  • This issue appears in iphone 7, huawei honor8 android phone.
  • This issue does not appear in PC browser, nor in ipad.

  At last, I suspect that the issue roots from video codec, but had no success to locate the keyword to explain my issue and google the solution.