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• 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

• 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

• What's the relationship between AVPacket in FFMpeg and H.264 NAL Uint ?

  8 juin 2016, par Ello

  I use FFMpeg’s api to encode images to H.264 stream, the code is like this encode code. When I called the function avcodec_encode_video2 I got one AVPacket’s data, then I saved it to file. I use several images to get several files for test.
  Based on the startcode 00 00 00 01 or 00 00 01, I found that the 1st and 2nd files’ data both contain several H.264 NAL Uints. But start from the third file, I can’t found the startcode. Like followed image.
  

  I feel confused. Base on the FFMpeg’s code I think one AVPacket’s data should contain at least one NAL Uint, but the result is unexpected. Is that means one NAL Uint may be divided to two AVPackets’ data ? What’s the relationship between AVPacket and H.264 NAL Uint ?