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• How do you set up carrierwave-video with ffmpeg ?

  24 septembre 2013, par Maleckai

  This has been doing my head in for the past 2 days, and I just cannot seem to get it working.

  I am building a simple Rails app with the sole purpose of uploading & processing images and videos. I'm working on Ubuntu Linux.

  Here's the relevant gems in my Gemfile :

  gem 'delayed_job_active_record'
  
  gem 'carrierwave'
  
  gem 'carrierwave-video'
  
  gem 'carrierwave_backgrounder'
  
  gem 'mini_magick'
  
  gem 'streamio-ffmpeg'

  At first I was having problems with ffmpeg complaining about certain arguments (I determined this by taking the command the rails app attempted to run when it was to convert a video, and running it manually outside rails), which I discovered was because the version of ffmpeg I was using was 'too new'. So I downgraded to 1.2.1, which is what streamio-ffmpeg says is the only version of ffmpeg they're tested against.

  After that, I could run the command manually, fine. But whenever I tried to convert through the app, I'd get the error :

  Failed to transcode with FFmpeg. Check ffmpeg install and verify video is not corrupt or cut short. Original error: nil is not a symbol

  I did a bit of Googling on the error, and only came up with one relevant result, but nothing in there has helped my situation.

  I'm at a total loss at this point, and am not sure where I can go from here. I assume many of people have tried this before, so I'm hoping someone can guide me on the exact steps they took to get carrierwave-video & ffmpeg working together.

• Defining moment of the audio attenuation through ffmpeg

  23 août 2016, par riki-tik

  There are audio tracks of different lengths in m4a format. And there’s ffmpeg library for working with the media. Many of the tracks have the effect of "decay" in the end, and it is necessary to determine at what point it occurs (determined once and the value entered in the database along with other information about the track). Those. we must somehow determine that the track begins to fade, and its volume reached 30% compared to the total volume of the song. Is it possible to solve by means of ffmpeg, and if so, how ?

• mediastreamvalidator "Error injecting segment data" and Can't deal with multiple sample timings per sample buffer

  18 août 2016, par Dathan Vance Pattishall

  So using ffmpeg

  /usr/local/bin/ffmpeg -i track.m4a -vn -c:a aac -b:a 192k  -f segment -segment_list 93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.m3u8 -segment_time 120 -segment_format_options movflags=faststart  93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.%03d.m4a

  a playlist file is created where

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:121
  
  #EXTINF:120.000726,
  
  93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.000.m4a
  
  #EXTINF:119.883175,
  
  93_jrf2niqb7n2s8pzjopkqvbbw1wmzz3foqrsa93bm.001.m4a
  
  #EXT-X-ENDLIST

  Then using mediastreamvalidator I get the following output which leads me to believe there are errors which I have no idea how to fix. I am assuming that ffmpeg is jacking up the segmenting.

  mediastreamvalidator http://**OMIT**/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8
  
  mediastreamvalidator: Version 1.2(160525)
  
  
  
  [/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8] Started root playlist download
  
  [/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8] Started media playlist download
  
  Error injecting segment data
  
  Can't deal with multiple sample timings per sample buffer
  
  Can't deal with multiple sample timings per sample buffer
  
  Can't deal with multiple sample timings per sample buffer
  
  Can't deal with multiple sample timings per sample buffer
  
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  Can't deal with multiple sample timings per sample buffer
  
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  Can't deal with multiple sample timings per sample buffer
  
  [/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8] All media files delivered and have end tag, stopping
  
  
  
  --------------------------------------------------------------------------------
  
  http://**OMIT**/AMP/1/92_y7lu9u1qy5wsw2fqn61mankqof7lkuu5qvk7asv5.m3u8
  
  --------------------------------------------------------------------------------
  
  Processed 1 out of 2 segments
  
  Average segment duration: 119.941950
  
  Total segment bitrates (all discontinuities): average: 130.88 kb/s, max: 131.25 kb/s
  
  
  
  
  
  Discontinuity: sequence: 0, parsed segment count: 1 of 2, duration: 239.884 sec, average: 130.88 kb/s, max: 131.25 kb/s
  
  Track ID: 1
  
  Audio Codec: AAC-LC
  
  Audio sample rate: 44100 Hz
  
  Audio channel layout: Stereo (L R)

  So, my question is what is "Error injecting segment data" and "Can’t deal with multiple sample timings per sample buffer" and why is the segment messed up ?