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• How encrypt video file using ffmpeg with a single file output

  9 décembre 2016, par Akshay Kumar

  I am trying to encrypt a video(mp4) file having a single file output. Here is the command that I use :
  ffmpeg -i -c:v libx264 -preset slow -hls_list_size 0 -hls_key_info_file encrypt.keyinfo -f hls -hls_playlist_type vod -hls_time 20 -threads 0 .
  However when I play the generated m3u8 file in safari the video stop for seconds(timer goes on) and resume after few seconds. This is happens multiple times in a single video playback.
  Can anyone help me to encode video file with single output file.

  Full command :

  /usr/local/bin/ffmpeg -i MJ.mp4 -c:v libx264  -preset slow -hls_list_size 0 -hls_key_info_file encrypt.keyinfo -f hls -hls_playlist_type vod -hls_flags single_file -hls_time 20  -threads 0 encrypted15.m3u8

  It’s corresponding console output :

  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MJ.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.63.104
  
    Duration: 00:04:43.21, start: 0.000000, bitrate: 1070 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 938 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 0x7f8930818200] using SAR=1/1
  
  [libx264 @ 0x7f8930818200] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7f8930818200] profile High, level 3.1
  
  Output #0, hls, to 'encrypted15.m3u8':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.100
  
      Stream #0:0(und): Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.64.101 aac
  
  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
  
  frame= 7079 fps= 64 q=-1.0 Lsize=N/A time=00:04:43.21 bitrate=N/A speed=2.55x
  
  video:30401kB audio:4156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0x7f8930818200] frame I:66    Avg QP:16.19  size: 44529
  
  [libx264 @ 0x7f8930818200] frame P:2496  Avg QP:20.09  size:  7995
  
  [libx264 @ 0x7f8930818200] frame B:4517  Avg QP:21.77  size:  1823
  
  [libx264 @ 0x7f8930818200] consecutive B-frames:  5.7% 10.3% 52.4% 31.6%
  
  [libx264 @ 0x7f8930818200] mb I  I16..4: 34.7% 39.2% 26.0%
  
  [libx264 @ 0x7f8930818200] mb P  I16..4:  4.8%  7.0%  0.7%  P16..4: 31.6%  7.1%  2.6%  0.0%  0.0%    skip:46.2%
  
  [libx264 @ 0x7f8930818200] mb B  I16..4:  0.4%  0.4%  0.0%  B16..8: 24.8%  1.6%  0.1%  direct: 0.9%  skip:71.8%  L0:39.4% L1:57.4% BI: 3.2%
  
  [libx264 @ 0x7f8930818200] 8x8 transform intra:52.6% inter:73.7%
  
  [libx264 @ 0x7f8930818200] direct mvs  spatial:99.9% temporal:0.1%
  
  [libx264 @ 0x7f8930818200] coded y,uvDC,uvAC intra: 23.4% 41.8% 12.7% inter: 3.8% 6.4% 0.3%
  
  [libx264 @ 0x7f8930818200] i16 v,h,dc,p: 40% 25% 12% 23%
  
  [libx264 @ 0x7f8930818200] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 16% 36%  2%  3%  4%  4%  3%  4%
  
  [libx264 @ 0x7f8930818200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 19% 14%  5%  8%  7%  8%  6%  6%
  
  [libx264 @ 0x7f8930818200] i8c dc,h,v,p: 49% 21% 21%  8%
  
  [libx264 @ 0x7f8930818200] Weighted P-Frames: Y:6.7% UV:6.2%
  
  [libx264 @ 0x7f8930818200] ref P L0: 66.8% 10.5% 12.6%  4.9%  5.1%  0.2%  0.0%
  
  [libx264 @ 0x7f8930818200] ref B L0: 82.4% 12.1%  4.5%  1.0%
  
  [libx264 @ 0x7f8930818200] ref B L1: 99.2%  0.8%
  
  [libx264 @ 0x7f8930818200] kb/s:879.53
  
  [aac @ 0x7f8930811e00] Qavg: 7830.089

• Recording desktop with gdigrab ffmeg to mp4 file with too high video_size don't working

  4 juillet 2016, par tagry

  I try to recording my desktop with ffmpeg using the command :

  ffmpeg -f gdigrab -framerate 10 -video_size 1920x1200 -i desktop -pix_fmt yuv420p -vcodec libx264 -preset ultrafast output.mp4

  The problem is when the video_size option is higher than some size, (for example height higher 1089), the video can’t be read with Windows Media. I noticed that with this high size, the video which be recorded doesn’t have informations about size. I don’t understand why the record don’t work with a too big size. If somebody can help me.
  Thank you very much and very sorry for my English.

  [edit]

      ffmpeg version N-78758-g5156578 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 27.100 / 57. 27.100
  
    libavformat    57. 26.100 / 57. 26.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 37.100 /  6. 37.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [gdigrab @ 00861860] Capturing whole desktop as 1920x1200x16 at (0,0)
  
  Input #0, gdigrab, from 'desktop':
  
    Duration: N/A, start: 1467631308.011542, bitrate: 368644 kb/s
  
      Stream #0:0: Video: bmp, rgb555le, 1920x1200, 368644 kb/s, 10 tbr, 1000k tbn, 10 tbc
  
  [libx264 @ 00863fe0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 00863fe0] profile Constrained Baseline, level 5.0
  
  [libx264 @ 00863fe0] 264 - core 148 r2665 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=10 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf57.26.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1200, q=-1--1, 10 fps, 10240 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc57.27.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (bmp (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=    6 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   11 fps= 11 q=10.0 size=     277kB time=00:00:00.40 bitrate=5664.4kbits/s speed=0.396x    
  
  frame=   16 fps= 11 q=9.0 size=     393kB time=00:00:00.90 bitrate=3578.8kbits/s speed=0.595x    
  
  frame=   21 fps= 10 q=9.0 size=     429kB time=00:00:01.40 bitrate=2507.4kbits/s speed=0.695x    
  
  frame=   26 fps= 10 q=9.0 size=     429kB time=00:00:01.90 bitrate=1849.3kbits/s speed=0.754x    
  
  frame=   31 fps= 10 q=18.0 size=     430kB time=00:00:02.40 bitrate=1466.1kbits/s speed=0.793x    
  
  frame=   36 fps= 10 q=10.0 size=     511kB time=00:00:02.90 bitrate=1442.6kbits/s speed=0.823x    
  
  frame=   41 fps= 10 q=10.0 size=     562kB time=00:00:03.40 bitrate=1353.0kbits/s speed=0.844x    
  
  frame=   46 fps= 10 q=10.0 size=     565kB time=00:00:03.90 bitrate=1185.9kbits/s speed=0.861x    
  
  frame=   51 fps= 10 q=9.0 size=     575kB time=00:00:04.40 bitrate=1070.8kbits/s speed=0.874x    
  
  frame=   56 fps= 10 q=12.0 size=     582kB time=00:00:04.90 bitrate= 972.3kbits/s speed=0.885x    
  
  frame=   61 fps= 10 q=10.0 size=     598kB time=00:00:05.40 bitrate= 907.7kbits/s speed=0.893x    
  
  frame=   66 fps= 10 q=10.0 size=     601kB time=00:00:05.90 bitrate= 834.5kbits/s speed=0.901x    
  
  frame=   71 fps= 10 q=10.0 size=     603kB time=00:00:06.40 bitrate= 772.3kbits/s speed=0.907x    
  
  frame=   76 fps= 10 q=12.0 size=     606kB time=00:00:06.90 bitrate= 719.8kbits/s speed=0.913x    
  
  frame=   81 fps= 10 q=10.0 size=     625kB time=00:00:07.40 bitrate= 691.8kbits/s speed=0.917x    
  
  frame=   86 fps= 10 q=10.0 size=     629kB time=00:00:07.90 bitrate= 652.2kbits/s speed=0.922x    
  
  frame=   91 fps= 10 q=12.0 size=     634kB time=00:00:08.40 bitrate= 618.2kbits/s speed=0.926x    
  
  frame=   97 fps= 10 q=10.0 size=     757kB time=00:00:09.00 bitrate= 689.3kbits/s speed=0.94x    
  
  frame=  100 fps= 10 q=-1.0 Lsize=     772kB time=00:00:10.00 bitrate= 632.8kbits/s speed=0.998x    
  
  video:771kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.153975%
  
  [libx264 @ 00863fe0] frame I:1     Avg QP:20.00  size:242961
  
  [libx264 @ 00863fe0] frame P:99    Avg QP:10.67  size:  5517
  
  [libx264 @ 00863fe0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 00863fe0] mb P  I16..4:  0.8%  0.0%  0.0%  P16..4:  2.9%  0.0%  0.0%  0.0%  0.0%    skip:96.3%
  
  [libx264 @ 00863fe0] coded y,uvDC,uvAC intra: 23.6% 15.1% 13.9% inter: 1.2% 1.3% 0.8%
  
  [libx264 @ 00863fe0] i16 v,h,dc,p: 65% 33%  1%  1%
  
  [libx264 @ 00863fe0] i8c dc,h,v,p: 61% 25% 13%  0%
  
  [libx264 @ 00863fe0] kb/s:631.31

• Dreamcast Track Sizes

  1er mars 2015, par Multimedia Mike — Sega Dreamcast

  I’ve been playing around with Sega Dreamcast discs lately. Not playing the games on the DC discs, of course, just studying their structure. To review, the Sega Dreamcast game console used special optical discs named GD-ROMs, where the GD stands for “gigadisc”. They are capable of holding about 1 gigabyte of data.

  You know what’s weird about these discs ? Each one manages to actually store a gigabyte of data. Each disc has a CD portion and a GD portion. The CD portion occupies the first 45000 sectors and can be read in any standard CD drive. This area is divided between a brief data track and a brief (usually) audio track.

  The GD region starts at sector 45000. Sometimes, it’s just one humongous data track that consumes the entire GD region. More often, however, the data track is split between the first track and the last track in the region and there are 1 or more audio tracks in between. But the weird thing is, the GD region is always full. I made a study of it (click for a larger, interactive graph) :

  
  
  

  Some discs put special data or audio bonuses in the CD region for players to discover. But every disc manages to fill out the GD region. I checked up on a lot of those audio tracks that divide the GD data and they’re legitimate music tracks. So what’s the motivation ? Why would the data track be split in 2 pieces like that ?

  I eventually realized that I probably answered this question in this blog post from 4 years ago. The read speed from the outside of an optical disc is higher than the inside of the same disc. When I inspect the outer data tracks of some of these discs, sure enough, there seem to be timing-sensitive multimedia FMV files living on the outer stretches.

  One day, I’ll write a utility to take apart the split ISO-9660 filesystem offset from a weird sector.