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• FFMPEG : Invalid Pixel Format String -1 when converting MP3 to SWF

  22 janvier 2013, par James Riley

  I'm having an issue with FFMPEG - receiving an error when trying to convert an MP3 into an SWF. The full output contains :

  $ ffmpeg -i track1.mp3 -y -ar '44100' -ab '96k' 'sample.swf'
  
      FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
      configuration: --enable-libmp3lame --enable-libvorbis --enable-shared --disable-mmx
  
      libavutil     50.36. 0 / 50.36. 0
  
      libavcore      0.16. 1 /  0.16. 1
  
      libavcodec    52.108. 0 / 52.108. 0
  
      libavformat   52.93. 0 / 52.93. 0
  
      libavdevice   52. 2. 3 / 52. 2. 3
  
      libavfilter    1.74. 0 /  1.74. 0
  
      libswscale     0.12. 0 /  0.12. 0
  
      Input #0, nsv, from 'track1.mp3':
  
       Metadata:
  
         encoder         : Lavf52.93.0
  
         artist          : Test
  
         title           : Track02
  
         album           : Mixtape
  
         disc            : 1/1
  
         genre           : Acoustic
  
         date            : 2013
  
         track           : 2/2
  
         album_artist    : Test
  
         Duration: 00:00:00.00, start: 0.000000, bitrate: -2147483 kb/s
  
         Stream #0.0: Video: [216][195]2[138] / 0x8A32C3D8, 44318x50468, 24 fps, 24 tbr, 24 tbn, 24 tbc
  
         Stream #0.1: Audio: h[228][146][142] / 0x8E92E468, 0 channels
  
      [buffer @ 0x175cd00] Invalid pixel format string '-1'
  
      Error opening filters!

  I'm aware the FFmpeg version here is old, but the issue is only occuring for one of the MP3s I am testing here. I have many others that are working just fine.

  What can be causing this issue and what steps can I take to resolve this ?

  From what I understand, the pixel format relates to the video output, yet in this case, the SWF is only to be used for audio. I've tested this on a newer version of FFmpeg and the issue isn't occuring - I certainly plan to upgrade FFmpeg on the test server I'm using, but would like to get to the bottom of why this is happening and try to get this particular MP3 converting, where its currently failing despite many others not having the same issue.

  Thanks for any help !

• Breaking a video into frames with python

  30 juillet 2012, par user1481112

  I am trying to write a program that deletes frames of a video that don't have a particular symbol in them. My general plan :

  1. Split the audio from the video
  2. Split the video into frames
  3. Run the frames through a subroutine that looks for the symbol, by checking the pixels where it should be for being the correct color, and logging the ones that don't.
  4. Delete those frames and corresponding audio seconds
  5. Splices it all back together.

  I need some help finding libraries that can do this. I was wondering if wxpython could do the detection of pixel color. I have no idea what library could split audio and video and which could edit audio. I know ffmpeg could split the video into frames but after two days of work I still have not been able to install it for python 2.7, so I either need a way to install it or a different library to do it. Any ideas ?

• php and ffmpeg, how many converts can do, once ?

  19 mars 2014, par dleline

  php and ffmpeg, how many converts can do, once

  For exemple in a simple hosting plan

  I have a php script that read remote flv files, bad things is that seeking in flash player doesn't work, so if is posible i want to pull video from seeking position with ffmpeg..