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• How to efficiently upload a GIF to twitter from a MP4 ?

  29 septembre 2019, par arl505

  I’m writing a Java (Spring-Boot) application which, when prompted, downloads media from Twitter via the twitter-api. Then, when prompted later, reposts the media.

  Twitter stores GIFs as MP4s. So when a tweet is sent with a GIF, I download it as a MP4. Then, when reposting, it is tweeted as a video.

  How can I best overcome this conversion issue so that media that is originally sent as a GIF is reposted as a GIF also ?

  I am thinking that I will need to use ffmpeg to convert the downloaded MP4 into a GIF and then upload the GIF. This just seems like potentially unnecessary overhead and so I was hoping to find a cleaner and more efficient solution.

  For a greater understanding on the requirements see the README here : https://github.com/arl505/twitter-memeDatabaseBot

• Error : ffmpeg : Failed to download resource "sqlite"

  22 février 2023, par nour

  i am trying to download ffmpeg but I am getting this error ! could anyone help ? I am using paperclip gem to add images and videos. I am getting this error on heroku when i try to add a new video Av::UnableToDetect (Unable to detect any supported library so that's why im trying to download ffmpeg. could someone help please ! thanks in advance

  


  brew install ffmpeg

  


  curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.
HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.
Error: ffmpeg: Failed to download resource "sqlite"
Download failed: https://sqlite.org/2022/sqlite-autoconf-3400100.tar.gz


  


  when i add a new video to my website on heroku I got this error

  


  2023-02-22T06:23:03.207072+00:00 app[web.1]: User Load (0.8ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
2023-02-22T06:23:03.208471+00:00 app[web.1]: Steptation Load (0.7ms)  SELECT  "steptations".* FROM "steptations" WHERE "steptations"."id" = $1 LIMIT 1  [["id", 1802]]
2023-02-22T06:23:03.210118+00:00 app[web.1]: [paperclip] Trying to link /tmp/RackMultipart20230222-2-1i28xon.mp4 to /tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-165fycl.mp4
2023-02-22T06:23:03.210923+00:00 app[web.1]: [paperclip] Trying to link /tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-165fycl.mp4 to /tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-p6icfm.mp4
2023-02-22T06:23:03.211217+00:00 app[web.1]: Command :: file -b --mime '/tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-p6icfm.mp4'
2023-02-22T06:23:03.218799+00:00 app[web.1]: [AV] Running command: if command -v avprobe 2>/dev/null; then echo "true"; else echo "false"; fi
2023-02-22T06:23:03.221000+00:00 app[web.1]: [AV] Running command: if command -v ffmpeg 2>/dev/null; then echo "true"; else echo "false"; fi
2023-02-22T06:23:03.222208+00:00 heroku[router]: at=info method=POST path= "/step_images?id=1802" host=www.mobileimplantlab.ca request_id=39f2b001-ab36-4a59-ae94-1f300d386a40 fwd="207.216.102.221" dyno=web.1 connect=0ms service=900ms status=500 bytes=234 protocol=https
2023-02-22T06:23:03.222987+00:00 app[web.1]: Completed 500 Internal Server Error in 18ms (ActiveRecord: 1.6ms)
2023-02-22T06:23:03.223510+00:00 app[web.1]: 
2023-02-22T06:23:03.223511+00:00 app[web.1]: Av::UnableToDetect (Unable to detect any supported library):
2023-02-22T06:23:03.223511+00:00 app[web.1]: app/controllers/step_images_controller.rb:15:in `create'
2023-02-22T06:23:03.223512+00:00 app[web.1]: 
2023-02-22T06:23:03.223512+00:00 app[web.1]: 
2023-02-22T06:23:14.356278+00:00 app[web.1]: Started POST "/step_images?id=1802" for 207.216.102.221 at 2023-02-22 06:23:14 +0000
2023-02-22T06:23:14.357993+00:00 app[web.1]: Processing by StepImagesController#create as HTML
2023-02-22T06:23:14.358067+00:00 app[web.1]: Parameters: {"utf8"=>"✓", "authenticity_token"=>"PgRtPGgyOSPP8lQlbf9fAgOSZre/XlYcKBKJhe81oOz9Ge81GZZzEfc4Xcnz0zzZ35S7PpsfKOse3Q73mxhjEA==", "step_image"=>{"product_id"=>"4", "text"=>"", "text2"=>"", "text3"=>"", "text4"=>"", "text5"=>"", "video"=>#, @original_filename="IMG_2826.mp4", @content_type="video/mp4", @headers="Content-Disposition: form-data; name=\"step_image[video]\"; filename=\"IMG_2826.mp4\"\r\nContent-Type: video/mp4\r\n">, "text6"=>"test", "user_id"=>"73", "case_id"=>"311", "step_id"=>"3"}, "commit"=>"Submit", "id"=>"1802"}
2023-02-22T06:23:14.359735+00:00 app[web.1]: User Load (0.8ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
2023-02-22T06:23:14.360954+00:00 app[web.1]: Steptation Load (0.7ms)  SELECT  "steptations".* FROM "steptations" WHERE "steptations"."id" = $1 LIMIT 1  [["id", 1802]]
2023-02-22T06:23:14.362132+00:00 app[web.1]: [paperclip] Trying to link /tmp/RackMultipart20230222-2-1stq4d4.mp4 to /tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-1jq0dqp.mp4
2023-02-22T06:23:14.362719+00:00 app[web.1]: [paperclip] Trying to link /tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-1jq0dqp.mp4 to /tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-9hfi7z.mp4
2023-02-22T06:23:14.362932+00:00 app[web.1]: Command :: file -b --mime '/tmp/847606d3771b12aa2d91db7647fe3a4920230222-2-9hfi7z.mp4'
2023-02-22T06:23:14.370045+00:00 app[web.1]: [AV] Running command: if command -v avprobe 2>/dev/null; then echo "true"; else echo "false"; fi
2023-02-22T06:23:14.372073+00:00 app[web.1]: [AV] Running command: if command -v ffmpeg 2>/dev/null; then echo "true"; else echo "false"; fi
2023-02-22T06:23:14.374070+00:00 app[web.1]: Completed 500 Internal Server Error in 16ms (ActiveRecord: 1.5ms)
2023-02-22T06:23:14.374254+00:00 heroku[router]: at=info method=POST path= "/step_images?id=1802" host=www.mobileimplantlab.ca request_id=4a0702a2-8d14-454a-9f1f-edf154e140fc fwd="207.216.102.221" dyno=web.1 connect=0ms service=267ms status=500 bytes=234 protocol=https
2023-02-22T06:23:14.374720+00:00 app[web.1]: 
2023-02-22T06:23:14.374721+00:00 app[web.1]: Av::UnableToDetect (Unable to detect any supported library):


  


  in my gem file

  


  source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.11.1'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.20.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
gem 'pry', '~> 0.13.1'
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development


group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

gem 'devise'
group :development, :test do
  gem "interactive_editor"
  gem "hirb"
  gem "awesome_print"
  gem 'byebug'
end
group :production do
  gem 'rails_12factor'
  gem 'puma'
end
gem 'mail_form'
gem 'font-awesome-sass', '~> 5.12.0'

gem 'bootsnap', '>= 1.1.0', require: false
gem 'bootstrap-sass', '~>3.2.0'

gem 'paperclip'

gem 'aws-sdk-s3'
gem 'aws-sdk', '< 2.0'

gem 'thor', '0.19.1'
gem 'omniauth-google-oauth2'
gem "recaptcha", require: "recaptcha/rails"
gem 'friendly_id', '~> 5.4.0'

gem 'activeadmin'

gem 'cocoon'
gem 'bigdecimal', '1.3.5'
gem 'bundler', '1.17.3'
gem 'paperclip-av-transcoder'
gem "paperclip-ffmpeg", "~> 1.2.0"
gem "will_paginate", "~> 3.0.4" 
gem 'rails-erd'
gem 'rails_autolink'

gem 'rails-erd', group: :development


  


  in the model

  


    has_attached_file :video, :styles => {
     :medium => { :geometry => "500x500", :format => 'jpg' },
     :thumb => { :geometry => "100x100", :format => 'jpg' }
  }, :processors => [:transcoder]

  validates_attachment_content_type :video,
    :content_type => [
      "video/mp4", 
      "video/quicktime",
      "video/3gpp",
      "video/x-ms-wmv",
      "video/mov",
      "video/flv",
      
      ]


  


• Decode a proprietary (Genetec) H264 network video stream

  2 mars 2023, par al_mukthar

  I have incoming byte streams probably encoded in H264 from a Genetec camera through a websocket in my spring boot application,

  


  I need to decode the incoming H264 streams to transmit the video to my frontend clients.
I have tried using javaCV/FFMpeg but nothing works.

  


  I think, Genetec is using some custom encoding which is different from normal encoding

  


  Any help would be appreciated

  


  this is the part of hex dump received through socket

  


  00000000: 01 00 00 00 04 48 32 36 34 00 00 00 24 38 65 34    .....H264...$8e4
00000010: 32 39 65 37 61 2D 32 66 34 66 2D 34 37 31 61 2D    29e7a-2f4f-471a-
00000020: 39 61 63 30 2D 66 66 62 38 64 64 37 63 37 64 37    9ac0-ffb8dd7c7d7
00000030: 32 00 00 00 D4 7B 22 49 73 49 6E 69 74 22 3A 66    2...T{"IsInit":f
00000040: 61 6C 73 65 2C 22 49 73 41 75 64 69 6F 22 3A 66    alse,"IsAudio":f
00000050: 61 6C 73 65 2C 22 54 6F 74 61 6C 53 65 63 6F 6E    alse,"TotalSecon
00000060: 64 73 22 3A 30 2E 30 36 2C 22 46 72 61 6D 65 54    ds":0.06,"FrameT
00000070: 69 6D 65 22 3A 22 32 30 32 33 2D 30 32 2D 32 33    ime":"2023-02-23
00000080: 54 30 34 3A 32 31 3A 35 33 2E 35 33 31 5A 22 2C    T04:21:53.531Z",
00000090: 22 53 65 71 75 65 6E 63 65 49 64 22 3A 31 2C 22    "SequenceId":1,"
000000a0: 42 61 73 65 44 65 63 6F 64 65 54 69 6D 65 22 3A    BaseDecodeTime":
000000b0: 32 36 35 38 37 2C 22 4D 65 64 69 61 54 69 6D 65    26587,"MediaTime
000000c0: 22 3A 32 36 35 38 37 2C 22 49 73 46 72 61 6D 65    ":26587,"IsFrame
000000d0: 48 69 64 64 65 6E 22 3A 66 61 6C 73 65 2C 22 49    Hidden":false,"I
000000e0: 73 4B 65 79 46 72 61 6D 65 22 3A 66 61 6C 73 65    sKeyFrame":false
000000f0: 2C 22 49 64 22 3A 34 34 35 2C 22 47 65 6E 65 72    ,"Id":445,"Gener
00000100: 61 74 69 6F 6E 22 3A 31 7D 00 00 3F 50 00 00 00    ation":1}..?P...
00000110: 68 6D 6F 6F 66 00 00 00 10 6D 66 68 64 00 00 00    hmoof....mfhd...
00000120: 00 00 00 01 BD 00 00 00 50 74 72 61 66 00 00 00    ....=...Ptraf...
00000130: 10 74 66 68 64 00 02 00 00 00 00 00 01 00 00 00    .tfhd...........
00000140: 14 74 66 64 74 01 00 00 00 00 00 00 00 00 00 67    .tfdt..........g
00000150: DB 00 00 00 24 74 72 75 6E 01 00 0F 01 00 00 00    [...$trun.......
00000160: 01 00 00 00 70 00 00 00 3C 00 00 3E E0 00 01 00    ....p...<..>`...
00000170: 00 00 00 00 00 00 00 3E E8 6D 64 61 74 00 00 3E    .......>hmdat..>
00000180: DC 41 E1 81 80 93 BE 16 2B 33 77 3D 4C B6 55 8B    \Aa...>.+3w=L6U.
00000190: D2 55 60 92 05 F7 F7 A4 97 54 4B 6C A6 68 48 84    RU`..ww$.TKl&hH.
000001a0: 68 FF D2 B6 6C 02 31 FC 24 01 78 EA BD 20 AD 15    h.R6l.1|$.xj=.-.
000001b0: F1 73 31 4B EB EF 18 1B 50 B3 13 F2 DC C6 4C E1    qs1Kko..P3.r\FLa
000001c0: 75 8B 94 52 6B C5 09 37 55 1E 45 66 6A 92 39 23    u..RkE.7U.Efj.9#
000001d0: C9 2D FD BB EC AD FD CF C4 30 75 FF 44 66 FA 85    I-};l-}OD0u.Dfz.
000001e0: D9 7C 18 72 AE 63 45 60 DD D7 65 44 84 49 95 8D    Y|.r.cE`]WeD.I..
000001f0: 2C 70 6C 57 8E E9 A9 EB B6 F6 78 BD D6 88 99 F6    ,plW.i)k6vx=V..v
00000200: FC 25 B1 0A FF DF CB 77 6A 67 37 24 A5 3D 8F A1    |%1.._Kwjg7$%=.!
00000210: 27 9B 4F 42 0E CD B8 87 6E C9 99 FC 6F 4C 53 4B    '.OB.M8.nI.|oLSK
00000220: 01 EA B6 AF 99 F8 22 C1 8F 1E C1 66 D6 8A 09 D6    .j6/.x"A..AfV..V
00000230: 99 79 91 F7 C1 2A 08 1F 81 CB 5E DD C3 CA 86 8F    .y.wA*...K^]CJ..
00000240: 57 BF 17 A2 64 6B 69 56 AE 19 1F 57 AD A6 D8 C2    W?."dkiV...W-&XB
00000250: 06 28 EB 46 D3 E4 85 51 3E E2 A5 40 50 50 85 7D    .(kFSd.Q>b%@PP.}
00000260: 72 6B 20 87 1A 6E 73 E1 B8 88 9E 20 23 48 6D FE    rk...nsa8...#Hm~
00000270: C2 0D 39 ED 24 B2 6D B5 9B 81 B6 BC F4 EE DE A2    B.9m$2m5..6..bB.{"&.!4.R^5
000002b0: 2A A6 E2 71 D7 4F 96 0A EC AE 8D 39 27 B8 CF 61    *&bqWO..l..9'8Oa
000002c0: CC ED E9 AF 74 C3 95 D3 E3 96 32 20 E6 31 0B E4    Lmi/tC.Sc.2.f1.d
000002d0: DC F4 FF 41 37 36 E7 DB 87 AE B3 7D BF CA F8 05    \t.A76g[..3}?Jx.
000002e0: 72 2A 38 AB B8 8E 98 43 97 C8 5E 80 57 C6 E7 1E    r*8+8..C.H^.WFg.
000002f0: 86 75 CE CD CE BF CF 10 C9 8A C2 C9 6E 33 41 AC    .uNMN?O.I.BIn3A,
00000300: 91 AC A8 F3 1B E6 D5 0A 22 A1 2C 4C 68 19 51 4D    .,(s.fU."!,Lh.QM
00000310: 17 DA AE E1 D7 BC 0E 2D F8 14 61 E2 4F BA 26 A3    .Z.aW<.-x.abO:&#
00000320: 0A E4 A6 BE 08 EA 3C 28 E6 C5 6B CA 3A 86 D2 59    .d&>.j<(fEkJ:.RY
00000330: 34 C2 ED 91 72 5A EF 2C BE D7 38 A4 60 D7 F3 97    4Bm.rZo,>W8$`Ws.
00000340: BB E6 FD C2 D0 29 10 B5 A4 79 D8 3E 61 48 8A F9    ;f}BP).5$yX>aH.y
00000350: C6 D8 13 D0 FD DB D6 FA 24 7F CD 5A BF 06 57 49    FX.P}[Vz$.MZ?.WI
00000360: 51 EC ED B2 74 AB 92 1D 37 68 70 A2 A5 31 B5 5F    Qlm2t+..7hp"%15_
00000370: EA CF 9E 3E 6A B1 78 16 B7 94 D1 46 7B 63 C1 67    jO.>j1x.7.QF{cAg
00000380: D2 B0 08 44 64 1E 68 15 39 80 E3 DD EB C0 E1 71    R0.Dd.h.9.c]k@aq
00000390: E8 EE D0 4D DF 4F 41 E0 96 C5 34 AD BC D3 9E 88    hnPM_OA`.E4-'.7pV%_>.T..
00000430: 7F FC AD 71 CE AF 54 8B 5D DC 27 34 20 A3 0A 73    .|-qN/T.]\'4.#.s
00000440: 76 A5 81 33 22 31 56 6B 1D 82 C4 32 FB 82 15 F6    v%.3"1Vk..D2{..v
00000450: 97 C8 47 29 3C 9E 59 9A C0 83 48 A0 55 CB C8 D6    .HG)<.Y.@.H.UKHV
00000460: 36 92 CC 54 A7 00 E3 28 9E 99 45 B2 E5 7E 88 A7    6.LT'.c(..E2e~.'
00000470: 28 4E CA 75 17 3C D3 B5 6C F5 FD AC 05 55 BF F7    (NJu.?{.T2Yr.h.wYGw
000004d0: 3C 19 C8 7B 81 9B 17 19 E9 81 A0 36 AD C6 62 71    <.H{....i..6-Fbq
000004e0: DB 68 72 8F 6A 37 45 D9 0E 6E DC 2C 5E 52 C2 75    [hr.j7EY.n\,^RBu
000004f0: 51 2F F9 CE 8A 10 12 E9 C8 68 A9 D6 A6 D7 5B 14    Q/yN...iHh)V&W[.
00000500: 11 51 42 FD BE B5 09 56 7F 19 C3 EB A7 A6 DF 6C    .QB}>5.V..Ck'&_l
00000510: 55 A3 11 DC EF 81 C3 CD DD 63 BF 38 F8 5A 4A 45    U#.\o.CM]c?8xZJE
00000520: 33 24 7B A4 55 B3 85 A6 87 75 3B 85 51 5C 03 B7    3${$U3.&.u;.Q\.7


  


  UPDATE TO THE CODE

  


  1st Packet find here
2nd Packet find here

  


  I have updated the code as per one of the comment to read only MDAT box to retrieve H264 stream from the incoming bytes[] through the socket, now I send only MDAT box contents (next byte after MDAT box)

  


  public Map.Entry> hasMdat(byte[] byteArray) {
    for (int i = 0; i < byteArray.length - 3; i++) {
        if (byteArray[i] == (byte) 109 &&
                byteArray[i + 1] == (byte) 100 &&
                byteArray[i + 2] == (byte) 97 &&
                byteArray[i + 3] == (byte) 116) {

            return Map.entry(true, Arrays.asList(i, i + 1, i + 2, i + 3));
        }
    }
    return Map.entry(false, List.of(0));
}


  


  This is my code which handles the byte stream

  


  initSocketConnection(new VideoStreamCallback() {
        @Override
        public void onVideoStreamReceived(byte[] bytes) {
           
Map.Entry> b = hasMdat(bytes);
        if (b.getKey()) {
            byte[] b1 = Arrays.copyOfRange(bytes, b.getValue().get(3) + 1, bytes.length);
  //write b1 back to client using spring SSE
            
        }

        }
    });