Body: <p>I have a directory of 100 mp4 files. All are working well on my ipad but most of them do not have a working thumb.</p>
  
  <p>I want to generate these thumbs with a command line command (on macosx) based on a frame of the movies (at second 30 for example).</p>
  
  <p>Thank you in advance</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-17T18:43:37.357Z
Comments.Text: What's the difference between the videos that do have a "working thumb" and ones that do not?
Comments.UserDisplayName: llogan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-18T07:41:45.630Z
Comments.Text: I dont have any idea. It is very weird because i dont have the same results in OSX.
Comments.UserDisplayName: Sucrenoir
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-18T18:23:48.503Z
Comments.Text: Do you see any differences within the `ffmpeg` console output? `ffmpeg -i works.mp4 -i notwork.mp4`?
Comments.UserDisplayName: llogan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-18T23:11:48.607Z
Comments.Text: Is this in the iPad's native *Videos* app?
Comments.UserDisplayName: Duvrai
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-19T08:58:23.047Z
Comments.Text: This is how it looks in Finder http://dl.dropboxusercontent.com/s/cb653aicns4xtql/2014-02-19%20at%2009.57.png
Comments.UserDisplayName: Sucrenoir
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-19T09:01:06.150Z
Comments.Text: It's worse on ipad with the native Video app https://dl.dropboxusercontent.com/s/n629jjphzkjqv6z/2014-02-19%20at%2010.00.png
Comments.UserDisplayName: Sucrenoir
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-19T09:07:07.393Z
Comments.Text: When i try to update the illustration with iTunes, the tab is just disabled for some videos. https://dl.dropboxusercontent.com/s/1q7phyyqwypxc6v/2014-02-19%20at%2010.07.png
Comments.UserDisplayName: Sucrenoir
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-02-19T09:10:36.467Z
Comments.Text: I get errors when using ffmpeg https://gist.github.com/iesta/9088516
Comments.UserDisplayName: Sucrenoir
Tags: <ffmpeg><mp4><mac>
Title: Set ipad compatible thumbs for mp4 videos based on a frame of the video with command line
UserDisplayName: Sucrenoir
ThreadText: # Set ipad compatible thumbs for mp4 videos based on a frame of the video with command line
  
  (Asked by: username_0 on 2014-02-17)
  
  I have a directory of 100 mp4 files. All are working well on my ipad but most of them do not have a working thumb.
  
  I want to generate these thumbs with a command line command (on macosx) based on a frame of the movies (at second 30 for example).
  
  Thank you in advance
  
  **Tags:** ffmpeg, mp4, mac
  
  > **Comments:**
  > **username_1**: What's the difference between the videos that do have a "working thumb" and ones that do not?  
  > **username_0**: I dont have any idea. It is very weird because i dont have the same results in OSX.  
  > **username_1**: Do you see any differences within the `ffmpeg` console output? `ffmpeg -i works.mp4 -i notwork.mp4`?  
  > **username_2**: Is this in the iPad's native *Videos* app?  
  > **username_0**: This is how it looks in Finder http://dl.dropboxusercontent.com/s/cb653aicns4xtql/2014-02-19%20at%2009.57.png  
  > **username_0**: It's worse on ipad with the native Video app https://dl.dropboxusercontent.com/s/n629jjphzkjqv6z/2014-02-19%20at%2010.00.png  
  > **username_0**: When i try to update the illustration with iTunes, the tab is just disabled for some videos. https://dl.dropboxusercontent.com/s/1q7phyyqwypxc6v/2014-02-19%20at%2010.07.png  
  > **username_0**: I get errors when using ffmpeg https://gist.github.com/iesta/9088516  
  
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  ## 0 answers
  
  