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• is it possible to play h264-mpegts format in ios ?

  11 octobre 2012, par jAckOdE

  Server transcodes the video to the h264/aac, and send video data to client simultaneously. To play and save the video data at the same time, I use mpegts as the container format, but the problem is that ios MediaPlayer can not play mpegts file.

  Google said that i can used ios-build of ffmpeg to do the task, but it seem to be an overkill. is there any other ways to play mpegts in iphone using just iOS SDK ?

• MP4 video slightly asynchronous - but only on initial play

  3 mai 2012, par TheSHEEEP

  Here is our procedure :

  1. We create live MP4 videos using ffmpeg (H264/AAC), both as API and as command line tool.*
  2. qt-faststart is used to move the metadata to the beginning of the file to enable fast playback in our Flash client.
  3. Video is renamed to *.m4v.
  4. User uses our Flash client to download the video and starts playing immediatly due to the metadata being at the beginning.

  Edit :
  *First, a MPG video is created with the ffmpeg API, this is then copied together with an intro and an outro video (you can simply chain MPG videos). The resulting MPG is then converted to MP4 using the following command :

  ffmpeg -i inputvideo.mpg -sameq -b 3000000 -vcodec libx264 -acodec libvo_aacenc -ac 2 -g 60 -y outputvideo.mp4

  Basically, this does work.

  The problem :

  We noticed that during the initial playback (the user hasn't clicked anything yet, video still downloading or not does not make a difference), the audio is playing asychnronous, noticeable if you look out for it.

  But as soon as you click around in the video (one time is enough, no matter where you click), the audio becomes more synchronous (still not perfect !) for the rest of the video.

  This behaviour is the same, no matter if you view it via our Flash player or Windows Media Player. Is there anything we can do from our side (in ffmpeg or qt-faststart) to make it synchronous from the start ?

• Video time reduced while conversion using ffmpeg and php

  1er mars 2013, par Ravi

  I am converting video files to .flv using ffmpeg and php.
  Here is my code

  $cmd = $this->ffmpeg . ' -i ' . $filein . ' -sameq -ar 22050 -b 2048k -f ' . $parameters['convert'] . ' ' . $fileout;

  Where $parameters['convert'] = flv

  Its working great for many files, but when i upload and ~80MB and ~9minutes .mp4 file, its is successfully converted to flv but the time reduces to 2 seconds. What may be the problem and possible solution.

  upload limit is set to 200MB