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• Android : mp4 file plays when downloaded but when choosing "Video" player gets "Cannot play video"

  11 juillet 2019, par gview

  I’ve converted the video to an mp4 with ffmpeg using the h264 codec and AAC, and used the baseline profile.

  Videos are 540x360x250kbps

  I then ran qt-faststart on the file to move the atoms into the right order.

  I’ve stuck the file up on a wiki we use and created a link to it.

  My test phone is a Samsung Galaxy S3.

  When I browse to the page that has links to the mp4’s on it, and I click on them, I get a popup window with 2 options : Internet and Video.

  If I download the videos using the "Internet" option, I can play them on the phone without issue.

  I’ve done other encodings with the main profile as well, and these also play fine. I thought that a powerful phone like the s3 would be able to handle the more advanced compression schemes available in h264, however I’ve also browsed the Android docs in regards to supported video formats, and it seems to state that only the "baseline" compression profile is supported.

  Regardless, what doesn’t work is trying to use the "Video" option which I assume tries to stream the video.

  For the wiki in question, clicking on the link reveals that the content-type and content-length headers are being set :

  Content-Length  6175996
  
  Content-Type    video/mp4;charset=UTF-8

  Clicking on the link with a browser invokes a player (Quicktime in most cases) that can play the mp4’s.

  Is there more to having the file HTTP streamable beyond making a link to it ? Why won’t my Android 4 play these files ?

  UPDATE :
  I decided to make a quick HTML5 page using the video tag, and the videos do play on both my Galaxy S3 and the latest IOS.

• How to make timelapse with ffmpeg from files with date-time names ?

  4 novembre 2019, par LA_

  I understand how to make timelapse video from the sequence of files.
  But what if my files have names like YYYYMMDDHHmmSS.jpg ? How can I pass them in the correct order ? I would prefer not to rename them (there are 55’000 files, almost 10 Gb).

• FFmpeg cannot recognize a preset even though it does exist Ubuntu 12.04

  6 septembre 2017, par Ahmad Tahboub

  I have installed ffmpeg and x264 folloowing the steps in this documentation :http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide

  Now I have this line to execute :

  sudo /usr/bin/ffmpeg -i input_file.flv -f flv -vcodec libx264 -vpre normal -r 25 -s 0x0 -aspect 1.7777777777778 -padcolor 000000 -padtop 0 -padbottom 0 -padleft 0 -padright 0 -acodec libfaac -ab 128000 -ar 22050 output_file.flv
  
  
  
  Input #0, flv, from 'WIN! Jwow.flv':
  
    Metadata:
  
      starttime       : 0
  
      totalduration   : 101
  
      totaldatarate   : 865
  
      bytelength      : 10897460
  
      canseekontime   : true
  
      sourcedata      : BD58B2E43HH1338284027987695
  
      purl            : 
  
      pmsg            : 
  
    Duration: 00:01:40.66, start: 0.000000, bitrate: 877 kb/s
  
      Stream #0.0: Video: h264 (Main), yuv420p, 640x360, 745 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
  
      Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 131 kb/s
  
  **File for preset 'normal' not found**

  I have the presets in the the following directories :

  /usr/share/ffmpeg
  
  /usr/local/share/ffmpeg
  
  /home/user/.ffmpeg
  
  /usr/local/src/ffmpeg/presets

  And still getting the same error : File for preset ’normal’ not found

  What is the problem here ?

  Extra info - this is what i get when i do ffmpeg -version

  ffmpeg version git-2012-05-31-60de761
  
  built on May 31 2012 15:54:11 with gcc 4.6.3
  
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab