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• stop ffmpeg gently (to allow it to finish writing mp4 file) when streaming from udp

  22 juillet 2015, par user1913115

  i’m trying to receive a udp stream on a server and write it to an mp4 file. this works fine :

    ffmpeg -i udp://127.0.0.1:12345 -codec copy out.mp4

  if i press CTRL+C (or send SIGINT to the process) the ffmpeg quits and i have a working mp4 file.

  however, if the data stops coming in on the udp port (e.g. after 10 minutes of streaming) and i try to stop ffmpeg it requires 2 interrupt signals at which point ffmpeg exits abruptly and results in an unplayable mp4 file.

  does anyone know how to prevent ffmpeg from hanging when there’s no input data or to force it to write out the mp4 header ?

  i know i can specify a url option

   udp://127.0.0.1:12345?timeout=<microseconds>
  
  </microseconds>

  however, i need to be able to ignore occasional (5-10 minute long) pauses during the process of recording and only quit at the end.
  so even if i set timeout=60000000 it will cause my app to wait for 10 minutes when i want to stop the stream (e.g. if there’s no data) and i need it to quit immediately when i send a SIGINT to it

• How I can keep the camera preview fps same as that in CamcorderProfile.videoFrameRate

  30 janvier 2015, par suitianshi

  Say I have a video recording app. The user press down a start button to start recording and lifts finger up to stop. For some reason I am using Camera.onPreviewCallback to receive byte data from preview and output it as a mp4 file(with ffmpeg libs). Suppose the user long presses start button for 10s, and I get 100 frames totally.How can I let my video last for exactly 10 seconds ?

  There are some problems :

  1. The fps of camera preview is not stable, so I can only get total number of frames as well as the desired duration when the recording stops.
  2. ffmpeg requires a fps field to be set when encoding(). I don’t know if I could set the fps value at the last time(that is, when I get all frames). The documents says it should be set when calling avformat_write_header(), so I guess not.

• Error : No such filter : '"movie', what's the isssue ?

  16 mars 2019, par uno

  I am using the code to add watermarks to videos on upload for carrierwave-video :

  process encode_video: [:mp4, resolution: "640x480", watermark: {
  
      path: "app/assets/images/logo-nike.jpg",
  
      position: :bottom_right,
  
      pixels_from_edge: 10
  
    }]

  When i use this code, i get error :

  (in short)

  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [AVFilterGraph @ 0x55c8909bf180] No such filter: '"movie'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!
  
  ):

  my ffmpeg version is 4.1.1

  Is there something missing from ffmpeg i need to install ? I have looked around and found no issues with others using this code (most posts are years old though)

  I found this : No such filter : ’drawtext’

  but isn’t the same thing ?