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• FFmpeg skips generating thumbs

  25 janvier 2018, par Awais fiaz

  I am using ffmpeg for creating thumbs out of videos within php script however ffmpeg skips creating thumbs sometimes but sometimes it goes okay and works fine i am a little confused of this strange behavior.

  Command which fails :

  Command : /opt/bin/ffmpeg -ss 00:00:06 -i /home/my/public_html/files/conversion_queue/1516767375521d6.mp4 -an -r 1 -y -f image2 -vframes 1 /home/my/public_html/files/thumbs/2018/01/24/1516767375521d6-original-1.jpg 

  Output error

  [image2 @ 0x2eaab00] Could not open file : /home/my/public_html/files/thumbs/2018/01/24/1516767375521d6-original-1.jpg
  
  av_interleaved_write_frame(): Input/output error
  
  frame= 1 fps=0.0 q=7.1 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=25.3x 
  
  video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed! 

  Command which works fine :

  Command : /opt/bin/ffmpeg -ss 00:01:01 -i /home/my/public_html/files/conversion_queue/1516867108c557e.mp4 -an -r 1 -y -f image2 -vframes 1 /home/my/public_html/files/thumbs/2018/01/25/1516867108c557e-original-1.jpg

  Output

  frame= 1 fps=0.0 q=3.1 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=49.9x 
  
  video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  Although both are same but still i am facing this issue.
  Any help regarding this would be really appreciated.

• How to speed up creating video mosaic with ffmpeg

  7 janvier 2020, par DALER RAHIMOV

  I’m looking to speed up ffmpeg pipeline in some way (camera configuration, different filters or any other ideas would be appreciated).

  I have a device that captures videos streams and later creates mosaic video view from 4 cameras. The main issue I’m having is that it’s taking too long to create mosaic video. There is no GPU on the device that could be used to accelerate the process so I’m left with camera configurations (Hikvision).

  Here is what I have so far

  About 160 sec on Intel J-1900 :

  - 5 min video files,
  
  - 640*480 resolution,
  
  - h264 encoding,
  
  - 10 fps,
  
  - 1024 max bitrate,
  
  - 10 I-frame interval,      

  Command that I’m using :

  ffmpeg -y -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 \
  
     -filter_complex " \
  
        color=c=black:size=1280x720 [base]; \
  
        [0:v] setpts=PTS-STARTPTS, scale=640x360 [cam0]; \
  
        [1:v] setpts=PTS-STARTPTS, scale=640x360 [cam1]; \
  
        [2:v] setpts=PTS-STARTPTS, scale=640x360 [cam2]; \
  
        [3:v] setpts=PTS-STARTPTS, scale=640x360 [cam3]; \
  
        [base][cam0] overlay=shortest=1:x=0:y=0  [z1]; \
  
        [z1][cam1] overlay=shortest=1:x=640:y=0  [z2]; \
  
        [z2][cam2] overlay=shortest=1:x=0:y=360  [z3]; \
  
        [z3][cam3] overlay=shortest=1:x=640:y=360 \
  
      " \
  
      -an -c:v libx264  -x264-params keyint=10 \
  
      -movflags faststart -preset fast -nostats -loglevel quiet -r 10.000000 mosaic.mp4

  Thanks

  Here is full output as requested

  ffmpeg -y -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 \
  
  >    -filter_complex " \
  
  >       color=c=black:size=1280x720 [base]; \
  
  >       [0:v] setpts=PTS-STARTPTS, scale=640x360 [cam0]; \
  
  >       [1:v] setpts=PTS-STARTPTS, scale=640x360 [cam1]; \
  
  >       [2:v] setpts=PTS-STARTPTS, scale=640x360 [cam2]; \
  
  >       [3:v] setpts=PTS-STARTPTS, scale=640x360 [cam3]; \
  
  >       [base][cam0] overlay=shortest=1:x=0:y=0  [z1]; \
  
  >       [z1][cam1] overlay=shortest=1:x=640:y=0  [z2]; \
  
  >       [z2][cam2] overlay=shortest=1:x=0:y=360  [z3]; \
  
  >       [z3][cam3] overlay=shortest=1:x=640:y=360 \
  
  >     " \
  
  >     -an -c:v libx264  -x264-params keyint=10 \
  
  >     -movflags faststart -preset fast -nostats -r 10.000000 mosaic.mp4
  
  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg -y -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4 -i 1578324600-1-stitched.mp4    -filter_complex " \
  
        color=c=black:size=1280x720 [base]; \
  
        [0:v] setpts=PTS-STARTPTS, scale=640x360 [cam0]; \
  
        [1:v] setpts=PTS-STARTPTS, scale=640x360 [cam1]; \
  
        [2:v] setpts=PTS-STARTPTS, scale=640x360 [cam2]; \
  
        [3:v] setpts=PTS-STARTPTS, scale=640x360 [cam3]; \
  
        [base][cam0] overlay=shortest=1:x=0:y=0  [z1]; \
  
        [z1][cam1] overlay=shortest=1:x=640:y=0  [z2]; \
  
        [z2][cam2] overlay=shortest=1:x=0:y=360  [z3]; \
  
        [z3][cam3] overlay=shortest=1:x=640:y=360 \
  
      "     -an -c:v libx264  -x264-params keyint=10     -movflags faststart -preset fast -r 10.000000 mosaic.mp4
  
  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1578324600-1-stitched.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:05:00.07, start: 0.000000, bitrate: 96 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x480, 95 kb/s, 10 fps, 25 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '1578324600-1-stitched.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:05:00.07, start: 0.000000, bitrate: 96 kb/s
  
      Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x480, 95 kb/s, 10 fps, 25 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '1578324600-1-stitched.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:05:00.07, start: 0.000000, bitrate: 96 kb/s
  
      Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x480, 95 kb/s, 10 fps, 25 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '1578324600-1-stitched.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:05:00.07, start: 0.000000, bitrate: 96 kb/s
  
      Stream #3:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x480, 95 kb/s, 10 fps, 25 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [libx264 @ 0x171c9e0] using SAR=1/1
  
  [libx264 @ 0x171c9e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0x171c9e0] profile High, level 3.1
  
  [libx264 @ 0x171c9e0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=10 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'mosaic.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 10 fps, 10240 tbn, 10 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts
  
    Stream #1:0 (h264) -> setpts
  
    Stream #2:0 (h264) -> setpts
  
    Stream #3:0 (h264) -> setpts
  
    overlay -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x1730600] Starting second pass: moving the moov atom to the beginning of the filerop=4497
  
  frame= 3002 fps= 17 q=-1.0 Lsize=   51052kB time=00:05:00.00 bitrate=1394.1kbits/s dup=0 drop=4498
  
  video:51017kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.068308%
  
  [libx264 @ 0x171c9e0] frame I:301   Avg QP:15.80  size:154257
  
  [libx264 @ 0x171c9e0] frame P:959   Avg QP:21.69  size:  5486
  
  [libx264 @ 0x171c9e0] frame B:1742  Avg QP:22.73  size:   315
  
  [libx264 @ 0x171c9e0] consecutive B-frames: 22.0%  0.0%  5.8% 72.2%
  
  [libx264 @ 0x171c9e0] mb I  I16..4:  9.7% 31.0% 59.4%
  
  [libx264 @ 0x171c9e0] mb P  I16..4:  0.6%  0.7%  0.2%  P16..4: 14.5%  2.8%  2.4%  0.0%  0.0%    skip:78.7%
  
  [libx264 @ 0x171c9e0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  2.7%  0.3%  0.0%  direct: 1.4%  skip:95.5%  L0:25.9% L1:73.3% BI: 0.9%
  
  [libx264 @ 0x171c9e0] 8x8 transform intra:31.8% inter:43.5%
  
  [libx264 @ 0x171c9e0] coded y,uvDC,uvAC intra: 83.2% 85.2% 69.5% inter: 3.0% 6.3% 0.7%
  
  [libx264 @ 0x171c9e0] i16 v,h,dc,p: 35% 21%  8% 36%
  
  [libx264 @ 0x171c9e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 42% 10%  3%  2%  3%  6%  4%  5%
  
  [libx264 @ 0x171c9e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 33%  9%  6%  5%  5%  7%  5%  6%
  
  [libx264 @ 0x171c9e0] i8c dc,h,v,p: 44% 29% 20%  7%
  
  [libx264 @ 0x171c9e0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x171c9e0] ref P L0: 93.8%  6.2%
  
  [libx264 @ 0x171c9e0] ref B L0: 91.7%  8.3%
  
  [libx264 @ 0x171c9e0] ref B L1: 89.3% 10.7%
  
  [libx264 @ 0x171c9e0] kb/s:1392.16

• 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