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• How to get Updated Shared Object Files of OpenCV and FFMPEG libraries to overcome Libpng vulnerability ? [duplicate]

  3 mars 2017, par Liya

  This question already has an answer here :

  • Libpng vulnerability
    
    2 answers
    

  We seek a technical help on a current issue which we are facing with one of our android application.

  Our application is for live video streaming and recording (both audio and video) using wifi camera . We have completed the development process and every functionality of the application is working as expected in current version. but once we tried to upload the application to Google has rejected the application stating that vulnerability issue with Libpng library version.

  Our application uses OpenCV, FFMPEG, JavaCV and JavaCPP libraries for Image processing for Video generation. But when we tried to upload to play store google have rejected application with following message :

  “ Hello Google Play Developer,

  We rejected Application name, for violating our Malicious Behavior or
  User Data policy. If you submitted an update, the previous version of
  your app is still available on Google Play.

  This app uses software that contains security vulnerabilities for
  users or allows the collection of user data without proper disclosure.

  Below is the list of issues and the corresponding APK versions that
  were detected in your recent submission. Please upgrade your app(s) as
  soon as possible and increment the version number of the upgraded APK.

  Vulnerability APK Version(s) Libpng library

  The vulnerabilities were fixed in libpng v1.0.66, v.1.2.56, v.1.4.19,
  v1.5.26 or higher. You can find more information about how resolve the
  issue in this Google Help Center article.”

  Since we have not used libpng library directly in our application we assume the problem is with opencv lib version which may be using libpng , so we replaced the opencv jar file with its gradle dependency and .so files of different libraries are combined in an armeabi.jar file and once we deleted the .so files from libs/armeabi.jar folder and uploaded to play store, then Google didn’t rejected with vulnerability issue and it got uploaded to the play store but the recording isn’t working in that version because we have removed the .SO files from the Project.

  So as per our assumptions the libpng vulnerability is not only due to opencv but also due to the other libraries or the .so files .So please kindly suggest us which all .SO files we can remove from the library , so our application functionality for video recording works properly .

  We tried to update the OpenCV, FFMPEG libraries and since the SO files are not getting regenerated so could not resolve this issue yet

  We already refer following links to find a solution :

  1. libpng-vulnerability

  2. opencv-in-android

  3. FFmpegAndroid

  For more information please read our stackover flow post regarding this issue :Libpng vulnerability

  We need help to solve this issue. Please let us know if you can help us to solve this issue since we are running out of time.

  PS : These are the assumptions we made on this issue, May be we are wrong , so please guide us to the right path so we can achieve our goal.

• FFMPEG : Adding font to Video gives error

  7 juin 2016, par janki gadhiya

  I am trying to execute ffmpeg on android. I have successfully executed 2-3 commands also. But i am stuck at one point where i am adding text to the video.

  Here is the command i am executing.

  NOT WORKING : because the text argument has a space between two words.

  "-i "+path+"out.mp4 -vf drawtext=fontfile="+path+"f1.ttf:text='Stack OverFlow' -y -c:v libx264 -c:a copy -movflags +faststart "+path+"output.mp4"

  WORKING : just removed space.

  "-i "+path+"out.mp4 -vf drawtext=fontfile="+path+"f1.ttf:text='StackOverFlow' -y -c:v libx264 -c:a copy -movflags +faststart "+path+"output.mp4"

  Here path contains my external Sd card’s path. out.mp4 and f1.ttf exists in my folder.

  My Question is why it is not working with space.

  Here is the stack trace i am getting.

  FAILED with output : WARNING: linker: /data/data/com.github.hiteshsondhi88.sampleffmpeg/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
  
  ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.8 (GCC)
  
  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/i686-linux-android- --arch=x86 --cpu=i686 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/x86 --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -march=i686' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
  libavutil      55. 17.103 / 55. 17.103
  
  libavcodec     57. 24.102 / 57. 24.102
  
  libavformat    57. 25.100 / 57. 25.100
  
  libavdevice    57.  0.101 / 57.  0.101
  
  libavfilter     6. 31.100 /  6. 31.100
  
  libswscale      4.  0.100 /  4.  0.100
  
  libswresample   2.  0.101 /  2.  0.101
  
  libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Testing/out.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf57.25.100
  
  Duration: 00:00:05.00, start: 0.000000, bitrate: 117 kb/s
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 300x300 [SAR 40:33 DAR 40:33], 113 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
  Metadata:
  
  handler_name    : VideoHandler
  
  [NULL @ 0xb585f000] Unable to find a suitable output format for 'text='Stack'
  
  text='Stack: Invalid argument

  Why it is saying invalid argument. It will be great if any ffmpeg expert can guide me in what i am doing wrong here.

  I have refered this Question of SO : Text on video ffmpeg

• Live streaming .webm file with ffmpeg and nginx

  9 décembre 2017, par seekahead

  Hi I am new to ffmpeg and I need some help with live streaming of .webm file which is still being written into. I have a .webm file containing only video in vp9 codecwhich needs to be live streamed (preferably without transcoding and streamed using DASH`. I have compiled nginx along with nginx-ts-module from (https://github.com/arut/nginx-ts-module#features) with the following configuration

  nginx version: nginx/1.12.1
  
  built by gcc 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) 
  
  built with OpenSSL 1.0.1f 6 Jan 2014
  
  TLS SNI support enabled
  
  configure arguments: --with-cc-opt='-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_sub_module --with-stream=dynamic --with-stream_ssl_module --with-stream_ssl_preread_module --with-mail=dynamic --with-mail_ssl_module --add-dynamic-module=/home/ubuntu/NGINX/nginx-ts-module-master

  The mediafile has the following properties(obtained with mediainfo) :

  General
  
  Complete name                            : video_4_1_Admin_0.webm
  
  Format                                   : WebM
  
  Format version                           : Version 2
  
  File size                                : 19.7 MiB
  
  Duration                                 : 1ms
  
  Overall bit rate                         : 165 Gbps
  
  Writing library                          : libwebm-0.2.1.0
  
  Video
  
  ID                                       : 1
  
  Format                                   : VP9
  
  Codec ID                                 : V_VP9
  
  Width                                    : 320 pixels
  
  Height                                   : 180 pixels
  
  Display aspect ratio                     : 16:9
  
  Frame rate mode                          : Variable
  
  Language                                 : English
  
  Default                                  : Yes
  
  Forced                                   : No

  I am trying to stream the file with the following

  ffmpeg -re -i video_4_1_Admin_0.webm -bsf:v vp9_superframe -c copy -f webm_chunk  http://127.0.0.1:8000/publish/sintel

  And I am getting the following error

  Input #0, matroska,webm, from 'video_4_1_Admin_0.webm':
  
    Metadata:
  
      encoder         : libwebm-0.2.1.0
  
    Duration: 00:00:00.00, start: 0.000000, bitrate: 174444152 kb/s
  
      Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 320x180, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
  Output #0, webm_chunk, to 'http://127.0.0.1:8000/publish/sintel':
  
  Output file #0 does not contain any stream

  I am not sure what are the exact options to be passed to ffmpeg so that it creates the .mpd and needed chunks which will allow me to LiveStream the media, I tried replacing the options given in the example (https://github.com/arut/nginx-ts-module#features) with what seems like vp9 equivalent., but, I am not sure. Can someone help me out here ? Thanks in advance