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• Concatenate 2 WMC Recordings

  9 septembre 2015, par user7415369

  I have two recorded tv shows from Windows Media Center that recorded one after the other. I want to be able to combine them into one file, so they play right after one another. They are both in .wtv format. I’d like to combine them losslessly if possible.

  I’ve tried the lossless methods here : https://trac.ffmpeg.org/wiki/Concatenate but can’t seem to get anything to work.

  I’ve tried :

  ffmpeg -f concat -i mylist.txt -c copy out.wtv

  with this mylist.txt :

  file '1.wtv'
  
  file '2.wtv'

  But I just get a file that doesn’t play.

  I’ve also tried :

  ffmpeg -i "concat:1.wtv|2.wtv" -c copy out.wtv

  But this gives me a playable file but only includes the first video, although the file size is bigger.

  I also attempted something similar to the example in the link above converting the files to transport streams first, but ran into problems combining the two, probably because the example uses aac audio and I have ac3. Maybe there is a different option for -bsf:a for ac3 audio ?

  ffmpeg -i 1.wtv -c copy -bsf:v imxdump -f mpegts intermediate1.ts
  
  ffmpeg -i 2.wtv -c copy -bsf:v imxdump -f mpegts intermediate2.ts
  
  ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output.mp4

  Any help or ideas on what else I could try would be much appreciated. Maybe this isn’t possible without re-encoding, but it seems like it should be simple enough.

  Here is info for the input files I am using :

  Input #0, wtv, from '1.wtv':
  
    Duration: 00:39:57.16, start: 1.828128, bitrate: 14820 kb/s
  
      Stream #0:0[0x2d](eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:1[0x2e](spa): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  
      Stream #0:2[0x2f]: Video: mpeg2video (Main), yuv420p(tv), 1920x1080 [SAR 1:1
  
   DAR 16:9], Closed Captions, max. 24000 kb/s, 29.97 fps, 29.97 tbr, 10000k tbn,
  
  59.94 tbc
  
      Stream #0:3[0x30]: Subtitle: eia_608
  
  
  
  Input #0, wtv, from '2.wtv':
  
    Duration: 00:25:12.04, start: 1.616899, bitrate: 14737 kb/s
  
      Stream #0:0[0x19](eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:1[0x1a](spa): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  
      Stream #0:2[0x1b]: Video: mpeg2video (Main), yuv420p(tv), 1920x1080 [SAR 1:1
  
   DAR 16:9], Closed Captions, max. 24000 kb/s, 29.97 fps, 59.94 tbr, 10000k tbn,
  
  59.94 tbc
  
      Stream #0:3[0x1c]: Subtitle: eia_608
  
      Stream #0:4[0xffffffff]: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown)
  
  , 200x113 [SAR 96:96 DAR 200:113], 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : TV Thumbnail

• Paperclip Video Skewed (does not maintain aspect ratio)

  3 septembre 2015, par zreitano

  The video uploaded does not maintain aspect ratio. In the readme (paperclip av-transcoder) it says, " ’ !’ - Keep the same aspect of the image/video, but with the passed dimension." I have also tried the other options(<># !) and none of them effect the size of the video.

  My goal is to be able to be able to have the video returned in a square (while maintaining the aspect ratio). Cropping from the center would be ideal, as well.

  Any help would be greatly appreciated. I included my code below.

  class Video < Post
  
  
  
    Paperclip.interpolates :id do |attachment, style|
  
      attachment.instance.id
  
    end
  
  
  
    #basename/extension is paperclip interpolation from attachment, can write own interpolations as needed
  
  
  
    # have to link /usr/local/bin to the linuxbrew version of ffmpeg
  
    has_attached_file :video,  path: "/posts/videos/:id/:style.:extension",
  
    :styles => {
  
      :square => {:geometry => "500x500!", :format => 'mp4', :streaming => true }
  
    },
  
    :processors => [:transcoder]
  
  
  
    validates_attachment :video, :presence => true,
  
                             :content_type => { content_type: ["video/mp4", "video/mov", "video/mpeg","video/mpeg4", "video/quicktime"] }
  
  
  
    def video_url
  
      video = self.video
  
      if video.present?
  
        return video.url(:square)
  
      end
  
    end
  
  
  
  end

• Ubuntu ffmepg watermark position

  8 juillet 2015, par Arnas Pečelis

  so I have command :

  ffmpeg -i prepared/video.mp4 -i units/video_watermark.png -filter_complex overlay=main_w-overlay_w-10:main_h-overlay_h-10 -codec:a copy moved/video_test.mp4

  which should describe watermark position on bottom right but the watermark appears on the bottom center. what i’m doing wrong ?

  also I tried this command :

  ffmpeg -i prepared/video.mp4 -vf "movie=units/video_watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" moved/output.mp4

  but with it watermark was not added, video was corrupted becouse of response :

  [aac @ 0x3556540] The encoder ’aac’ is experimental but experimental codecs are not enabled, add ’-strict -2’ if you want to use it.

  where is the clue ?