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• sending udp cbr content using ffmpeg makes memory problem

  30 décembre 2020, par Przemo

  I am struggling with muxing a few UDP inputs (SPTS from file) in one UDP output (MPTS).
When I use following command

  


  ffmpeg -thread_queue_size 2048 -i "udp://233.0.0.1:4005?fifo_size=1000000&buffer_size=10000000" -thread_queue_size 2048 -i "udp://233.0.0.1:4000?fifo_size=1000000&buffer_size=10000000" -thread_queue_size 2048 -i "udp://233.0.0.1:4001?fifo_size=1000000&buffer_size=10000000" -thread_queue_size 2048 -i "udp://233.0.0.1:4002?fifo_size=1000000&buffer_size=10000000" -thread_queue_size 2048 -i "udp://233.0.0.1:4003?fifo_size=1000000&buffer_size=10000000" -thread_queue_size 2048 -i "udp://233.0.0.1:4004?fifo_size=1000000&buffer_size=10000000" -map 0 -map 1 -map 2 -map 3 -map 4 -map 5 -program title=Program0:st=0:st=1 -program title=Program1:st=2:st=3 -program title=Program2:st=4:st=5 -program title=Program3:st=6:st=7 -program title=Program4:st=8:st=9 -program title=Program5:st=10:st=11 -c copy -metadata service_provider=FILE -f mpegts -muxrate 40000000 -flush_packets 0 "udp://239.2.2.2:2222?overrun_nonfatal=1&fifo_size=1000000&buffer_size=10000000&pkt_size=1316&ttl=1"


  


  I can play (with VLC) the MPTS content many hours with no problems.

  


  When I add a bitrate parameter to make UDP output stream as CBR

  


  "udp://239.2.2.2:2222?overrun_nonfatal=1&fifo_size=1000000&buffer_size=10000000&pkt_size=1316&ttl=1&bitrate=40000000"


  


  instead of

  


  "udp://239.2.2.2:2222?overrun_nonfatal=1&fifo_size=1000000&buffer_size=10000000&pkt_size=1316&ttl=1"


  


  a hear many audio cuts, and from VLC I see then :

  


  


  main warning : timing screwed (drift : -89659 us) : stopping resampling
  
main warning : playback too early (-89367) : down-sampling
  
main warning : playback way too early (-126525) : playing silence
  
main debug : inserting 6073 zeroes
  
main warning : playback too early (-47858) : down-sampling
  
main warning : timing screwed (drift : -97495 us) : stopping resampling
  
main warning : playback too early (-96807) : down-sampling
  
main warning : playback way too early (-134672) : playing silence
  
main debug : inserting 6464 zeroes

  


  


  and after some random time (several minutes) ffmpeg stops working due to following error :

  


  


  av_interleaved_write_frame() : Cannot allocate memory

  


  


  How to make it work with CBR UDP bitrate ?
  
I tired changing parameters of buffer_size and fifo_size but with no success.
  
I've increased OS UDP buffers to improve performance but same memory problem is visible

  


• Thumbs depending on the video duration

  28 février 2017, par MaelLacour

  as said in the title, i would like to add thumbs, depending on the video duration.

  It it possible to define time using percentage ? Or to use a variable duration ? I know that the duration can be found in the _meta, but is it possible to retrieve it before saving the video ?
  (I can certainly do it by using ffmpeg command, but it should be available using paperclip command ?)

  Here is my code :

  validates :title,
  
          length: { in: 2..60 }
  
  validates :description,
  
          length: { minimum: 2 }
  
  
  
  
  
  has_attached_file :content, styles: {
  
      :medium => {
  
          :format => 'mp4',
  
          #convert_options: {
  
              #output: {
  
                #name: 'value' # Results in `-name value` in the command line
  
              #}
  
          #}
  
      },
  
    :thumb0 => { :geometry => '320x180#', :format => 'jpeg', :time => 1.0 * duration / 6.0},
  
    :thumb1 => { :geometry => '320x180#', :format => 'jpeg', :time => 2.0 * duration / 6.0},
  
    :thumb2 => { :geometry => '320x180#', :format => 'jpeg', :time => 3.0 * duration / 6.0},
  
    :thumb3 => { :geometry => '320x180#', :format => 'jpeg', :time => 4.0 * duration / 6.0},
  
    :thumb4 => { :geometry => '320x180#', :format => 'jpeg', :time => 5.0 * duration / 6.0},
  
    }, :processors => [:transcoder]
  
  
  
    validates_attachment :content, presence: true,
  
                         content_type: { content_type: /\Avideo\/.*\Z/ },
  
                         size: { :less_than => 2.gigabytes }

  Thx in advance for your reply ! If it’s not clear or if you need extra-data let me know :)

  (I posted my question here, after wrongly posted it in GitHub, don’t be surprise if you found it on the issue repo)

  EDIT

  I made it to work with the following code,even if it’s not elegant at all :

    has_attached_file :content, styles: {
  
        :medium => {
  
            :format => 'mp4',
  
        },
  
        :thumb0 => { :geometry => '320x180#', :format => 'jpeg', :time => ->(attachment) { attachment.instance.method(:style_time_for0) } },
  
        :thumb1 => { :geometry => '320x180#', :format => 'jpeg', :time => ->(attachment) { attachment.instance.method(:style_time_for1) } },
  
        :thumb2 => { :geometry => '320x180#', :format => 'jpeg', :time => ->(attachment) { attachment.instance.method(:style_time_for2) } },
  
        :thumb3 => { :geometry => '320x180#', :format => 'jpeg', :time => ->(attachment) { attachment.instance.method(:style_time_for3) } },
  
        :thumb4 => { :geometry => '320x180#', :format => 'jpeg', :time => ->(attachment) { attachment.instance.method(:style_time_for4) } },
  
        }, :processors => [:transcoder]
  
  
  
    def style_time_for0(meta, _options)
  
      1*meta[:duration].to_f / 6
  
    end
  
    def style_time_for1(meta, _options)
  
      2*meta[:duration].to_f / 6
  
    end
  
    def style_time_for2(meta, _options)
  
      3*meta[:duration].to_f / 6
  
    end
  
    def style_time_for3(meta, _options)
  
      4*meta[:duration].to_f / 6
  
    end
  
    def style_time_for4(meta, _options)
  
      5*meta[:duration].to_f / 6
  
    end

  I should add a loop and a parameter to the style_time_for, but i can’t get it to work. Does someone have an idea ?

• How do I compose three overlapping videos w/audio in ffmpeg ?

  10 avril 2021, par Idan Gazit

  I have three videos : let's call them intro, recording and outro. My ultimate goal is to stitch them together like so :

  


  

  


  Both intro and outro have alpha (prores 4444) and a "wipe" to transition, so when overlaying, they must be on top of the recording. The recording is h264, and ultimately I'm encoding out for youtube with these recommended settings.

  


  I've figured out how to make the thing work correctly for intro + recording :

  


  $ ffmpeg \
  -i intro.mov \
  -i recording.mp4 \
  -filter_complex \
  "[1:v]tpad=start_duration=10:start_mode=add:color=black[rv]; \
   [1:a]adelay=delays=10s:all=1[ra]; \
   [rv][0:v]overlay[v];[0:a][ra]amix[a]" \
  -map "[a]" -map "[v]" \
  -movflags faststart -c:v libx264 -profile:v high -bf 2 -g 30 -crf 18 -pix_fmt yuv420p \
  out.mp4 -y


  


  However I can't use the tpad trick for the outro because it would render black frames over everything.

  


  I've tried various iterations with setpts/asetpts as well as passing -itsoffset for the input, but haven't come up with a solution that works correctly for both video and audio. This tries to start the outro at 16 seconds into the recording (10s start + 16s of recording is how I got to setpts=PTS+26/TB). del, but doesn't work correctly, I get both intro and outro audio from the first frame, and the recording audio cuts out when the outro overlay begins :

  


  $ ffmpeg \
  -i intro.mov \
  -i recording.mp4 \
  -i outro.mov \
  -filter_complex \
  "[1:v]tpad=start_duration=10:start_mode=add:color=black[rv]; \
   [1:a]adelay=delays=10s:all=1[ra]; \
   [2:v]setpts=PTS+26/TB[outv]; \
   [2:a]asetpts=PTS+26/TB[outa]; \
   [rv][0:v]overlay[v4]; \
   [0:a][ra]amix[a4]; \
   [v4][outv]overlay[v]; \
   [a4][outa]amix[a]" \
  -map "[a]" -map "[v]" \
  -movflags faststart -c:v libx264 -profile:v high -bf 2 -g 30 -crf 18 -pix_fmt yuv420p \
  out.mp4 -y


  


  I think the right solution lies in the direction of using setpts correctly but I haven't been able to wrap my brain fully around it. Or, maybe I'm making life complicated and there's an easier approach ?

  


  In the nice-to-have realm, I'd love to be able to specify the start of the outro relative to the end of the recording. I will be doing this to a bunch of recordings of varying lengths. It would be nice to have one command to invoke on everything rather than figuring out a specific timestamp for each one.

  


  Thank you !