Recherche avancée

Sur d’autres sites (7209)

• Non-monotonous DTS in output stream when concat videos using ffmpeg

  8 février 2018, par no name

  I have three videos which I want to concat together the problem it works fine for some videos but when I test a specific video it gives me an error and cause the resulting video to show in a strange way and everything is moving very fast in the video like I was forward up the video
  this the code I used to add the video together from a file this the out.txt

  file 'D:/Build/start.mp4'
  
  file 'D:/Build/a.mp4'
  
  file 'D:/Build/Song & Lyrics/2f.mp4'

  the command i used with ffmpeg

  ffmpeg -f concat -safe 0 -i out.txt -c copy -y go.mp4

  i faced this error

      [mov,mp4,m4a,3gp,3g2,mj2 @ 05c0dbc0] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'out.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 280 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 155 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
  Output #0, mp4, to 'go.mp4':
  
    Metadata:
  
      encoder         : Lavf58.7.100
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 155 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 05c38840] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 061b8f00] Non-monotonous DTS in output stream 0:0; previous: 624624, current: 88735; changing to 624625. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 061b8f00] Non-monotonous DTS in output stream 0:0; previous: 624625, current: 89247; changing to 624626. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 061b8f00] Non-monotonous DTS in output stream 0:0; previous: 624626, current: 89759; changing to 624627. This may result in incorrect timestamps in the output file.
  
  .....
  
  
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 05c38840] Auto-inserting h264_mp4toannexb   bitstream filtereed=69.7x
  
  frame= 8991 fps=2903 q=-1.0 Lsize=    8378kB time=00:05:58.22 bitrate= 191.6kbits/s speed= 116x
  
  video:2469kB audio:5625kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.500685%

  so what the problem make this error. the problem appear when i use this new start.mp4 to be merge with my videos i tried on other ones and it worked fine.
  Update
  i tested to convert the videos to MTS formate then concate them as an answer to similar problem but the problem is when i convert the mp4 videos to this formate the size of the file be too large from 6 MB to 42 MB !! so if there is a better answer. or a way to make the file still same size or less
  the linke of the answer is here but it worked fine
  Thanks in advance

• ffmpeg - how to use pipe with amovie parameter ?

  19 février 2018, par user1347009

  I am looking for a solution to overlay to mp3 files in which the longer one will be played in the background and the smaller one will continue to play like a loop with that.
  My current code is working without pipe :

  ffmpeg -i 'longer.mp3'  -filter_complex "amovie='small.mp3:loop=999'[s];[0][s]amix=duration=shortest" new.mp3

  This code works like a charm but what i want to achieve is this :

  curl "any-url-to-api-to-audio-file" | ffmpeg -i 'longer.mp3'  -filter_complex "amovie='pipe\:0:loop=999'[s];[0][s]amix=duration=shortest" new.mp3

  This code is not working and its giving me error as well,

  ffmpeg version N-89955-g118e1b0b33 Copyright (c) 2000-2018 the FFmpeg 
  
  developers
  
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
  
  configuration: --enable-openssl --enable-libmp3lame
  
  libavutil      56.  7.100 / 56.  7.100
  
  libavcodec     58.  9.100 / 58.  9.100
  
  libavformat    58.  7.100 / 58.  7.100
  
  libavdevice    58.  0.101 / 58.  0.101
  
  libavfilter     7. 11.101 /  7. 11.101
  
  libswscale      5.  0.101 /  5.  0.101
  
  libswresample   3.  0.101 /  3.  0.101
  
  Input #0, mp3, from 'morning_alarm.mp3':
  
  Duration: 00:00:28.06, start: 0.025057, bitrate: 128 kb/s
  
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  Metadata:
  
  encoder         : LAME3.97 
  
  Side data:
  
  replaygain: track gain - -9.200000, track peak - unknown, album gain - unknown, album peak - unknown, 
  
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                               Dload  Upload   Total   Spent    Left  Speed
  
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     
  
  0101  5088  101  5088    0     0  28080      0 --:--:-- --:--:-- --:--:--  160k
  
  Stream mapping:
  
  Stream #0:0 (mp3) -> amix:input0
  
  amix -> Stream #0:0 (libmp3lame)
  
  Press [q] to stop, [?] for help
  
  [Parsed_amovie_0 @ 0x26c76c0] Failed to avformat_open_input 'pipe:0'
  
  [AVFilterGraph @ 0x26c3d80] Error initializing filter 'amovie' with args 
  
  'pipe\:0:loop=999'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid data found when 
  
  processing input
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!

  All i want to do is to overlay two audio files via command line in which 1st audio file will be longer and the second one will be smaller.
  The smaller one will be repeated like a loop till the longer one play.

  Please tell me how can i do that ?

• How to keep personally identifiable information safe

  23 janvier 2020, par Joselyn Khor
  The protection of personally identifiable information (PII) is important both for individuals, whose privacy may be compromised, and for businesses that may have their reputation ruined or be liable if PII is wrongly accessed, used, or shared.

  Curious about what PII is ? Here’s your introduction to personally identifiable information.

  Due to hacking, data leaks or data thievery, PII acquired can be combined with other pieces of information to form a more complete picture of you. On an individual level, this puts you at risk of identity theft, credit card theft or other harm caused by the fraudulent use of your personal information.

  On a business level, for companies who breach data privacy laws – like Cambridge Analytica’s harvesting of millions of FB profiles – the action leads to an erosion of trust. It can also impact your financial position as heavy fines can be imposed for the illegal use and processing of personally identifiable information.

  So what can you do to ensure PII compliance ?

  On an individual level :

  1. Don’t give your data away so easily. Although long, it’s worthwhile to read through privacy policies to make sure you know what you’re getting yourself into.
  2. Don’t just click ‘agree’ when faced with consent screens, as consent screens are majorly flawed. Users mostly always opt in without reading and without being properly informed what they opt in to.
  3. Did you know you’re most likely being tracked from website to website ? For example, Google can identify you across visits and websites. One of the things you can do is to disable third party cookies by default. Businesses can also use privacy friendly analytics which halt such tracking. 
  4. Use strong passwords.
  5. Be wary of public wifi – hackers can easily access your PII or sensitive data. Use a VPN (virtual private network), which lets you create a secure connection to a server of your choosing. This allows you to browse the internet in a safe manner.

  A PII compliance checklist for businesses/organisations :

  1. Identify where all PII exists and is stored – review and make sure this is in a safe environment.
  2. Identify laws that apply to you (GDPR, California privacy law, HIPAA) and follow your legal obligations.
  3. Create operational safeguards – policies and procedures for handling PII at an organisation level ; and building awareness to focus on the protection of PII.
  4. Encrypt databases and repositories where such info is kept.
  5. Create privacy-specific safeguards in the way your organisation collects, maintains, uses, and disseminates data so you protect the confidentiality of the data.
  6. Minimise the use, collection, and retention of PII – only collect and keep PII if it’s necessary for you to perform your legal business function.
  7. Conduct privacy impact assessments (PIA) to find and prevent privacy risks (identify what and why it’s to be collected ; how the information will be secured etc.).
  8. De-identify within the scope of your data collection and analytics tools.
  9. Anonymise data.
  10. Keep your privacy policy updated.
  11. Pseudonymisation.
  12. A more comprehensive guide for businesses can be found here : https://iapp.org/media/pdf/knowledge_center/NIST_Protecting_PII.pdf

  Unsure of what information could be considered PII ? Check out this list of examples.

  Additional resources :

  • https://www.umassmed.edu/it/security/compliance/what-is-pii/
  • http://www.osec.doc.gov/opog/privacy/PII_BII.html