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• No sound when capture screen

  10 janvier 2018, par scrapy

  To capture my pc screen with following ffmpeg command.

  ffmpeg -f pulse -ac 2 -i default -f x11grab -r 30 -s 1920x1080 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 0 -y /tmp/output.mkv

  The output displayed on my console when to execute the above command.

  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, pulse, from 'default':
  
    Duration: N/A, start: 1515543051.106987, bitrate: 1536 kb/s
  
      Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  [x11grab @ 0x564bda5b8520] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #1, x11grab, from ':0.0':
  
    Duration: N/A, start: 1515543052.415508, bitrate: N/A
  
      Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x564bda5c1560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 LZCNT
  
  [libx264 @ 0x564bda5c1560] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
  
  [libx264 @ 0x564bda5c1560] 264 - core 148 r2748 97eaef2 - 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=6 threads=3 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=25 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, matroska, to '/tmp/output.mkv':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1920x1080, q=-1--1, 30 fps, 1k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        encoder         : Lavc57.64.101 pcm_s16le
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))

  Playing a music when to make the screenshot,i can hear the music playing lound.
  It’s strange that vedio came out perfectly without sound when to play the captured /tmp/output.mkv.

  Open my volume control with pavucontrol.

  Nothing in recording window, maybe the blank recording window result in no souond when to capture screen !
  How to fix it ?

  

  

  

  

  

• Crop individual frames of a video and then concat for output

  27 juin 2024, par Ashish Padave

  I want to Crop individual frames of a video and then concat for output. This works with 2 ffmpeg commands. The first one extracts each frame and the second concats them.
I want to get it done without the intermediate frames.

  


  Tried with the following

  


  ffmpeg  -y -i input.mp4 -filter_complex "[0:v]split=890[v0][v1][v2][v3][v4][v5];[v0]select='eq(n\,0)',setpts=PTS-STARTPTS,crop=404:720:225:0[v0]; [v1]select='eq(n\,1)',setpts=PTS-STARTPTS,crop=404:720:225:0[v1]; [v2]select='eq(n\,2)',setpts=PTS-STARTPTS,crop=404:720:225:0[v2]; [v3]select='eq(n\,3)',setpts=PTS-STARTPTS,crop=404:720:225:0[v3]; [v4]select='eq(n\,4)',setpts=PTS-STARTPTS,crop=404:720:225:0[v4]; [v5]select='eq(n\,5)',setpts=PTS-STARTPTS,crop=404:720:225:0[v5];[v0][v1][v2][v3][v4][v5]concat=n=6:v=1:a=0[outv]" -map "[outv]" -map 0:a? -c:a copy -vsync 2 output.mp4


  


  The above is an abridged version of the command. The video I am working with has 890 frames and a frame rate of 25.

  


  The output log with 890 frames is

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.5.100
  Duration: 00:00:35.61, start: 0.000000, bitrate: 3380 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 3246 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 (h264) -> split
  concat -> Stream #0:0 (libx264)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 0x55963ad4b700] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x55963ad4b700] profile High, level 3.0
[libx264 @ 0x55963ad4b700] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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=12 lookahead_threads=2 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 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 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 404x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
frame=    3 fps=0.6 q=-1.0 Lsize=     586kB time=00:00:35.59 bitrate= 134.9kbits/s dup=0 drop=887 speed=6.73x
video:21kB audio:558kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.278277%
[libx264 @ 0x55963ad4b700] frame I:1     Avg QP:23.09  size: 17546
[libx264 @ 0x55963ad4b700] frame P:1     Avg QP:25.73  size:  2069
[libx264 @ 0x55963ad4b700] frame B:1     Avg QP:26.34  size:   845
[libx264 @ 0x55963ad4b700] consecutive B-frames: 33.3% 66.7%  0.0%  0.0%
[libx264 @ 0x55963ad4b700] mb I  I16..4:  8.4% 68.9% 22.7%
[libx264 @ 0x55963ad4b700] mb P  I16..4:  0.1%  0.6%  0.3%  P16..4: 28.5%  5.0%  3.9%  0.0%  0.0%    skip:61.6%
[libx264 @ 0x55963ad4b700] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 29.6%  3.4%  0.3%  direct: 0.2%  skip:66.4%  L0:59.3% L1:35.6% BI: 5.1%
[libx264 @ 0x55963ad4b700] 8x8 transform intra:68.8% inter:73.3%
[libx264 @ 0x55963ad4b700] coded y,uvDC,uvAC intra: 73.0% 80.1% 36.4% inter: 3.9% 7.0% 0.7%
[libx264 @ 0x55963ad4b700] i16 v,h,dc,p:  2% 74%  6% 18%
[libx264 @ 0x55963ad4b700] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 36% 20%  8%  4%  2%  6%  4%  8%
[libx264 @ 0x55963ad4b700] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 41% 10%  4%  7%  4%  5%  3%  5%
[libx264 @ 0x55963ad4b700] i8c dc,h,v,p: 44% 37% 14%  6%
[libx264 @ 0x55963ad4b700] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x55963ad4b700] kb/s:1364.00


  


  So it is basically dropping 887 frames. The output file has the full audio but no video.
Is this even possible ?

  


• Converting avi to mp4 (use ffmpeg library) is very slow [closed]

  7 décembre 2012, par yAnTar

  I have task - convert any video from user to mp4 format.
  I use command

  ffmpeg -i $file -vcodec libx264 -vpre ultrafast -bt 500k -acodec libfaac -ab 56k -ac 2 -s 480x320 $outputFileMp4

  I try to change options bitrate, dimensions, but spped of converting is slow - 3 mbytes convert arround 90 seconds.

  If i convert avi to flv - no problem.

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  Input #0, avi, from 'intro.avi':
  
    Duration: 00:07:48.53, start: 0.000000, bitrate: 244 kb/s
  
      Stream #0.0: Video: camtasia, bgr24, 800x600, 15 tbr, 15 tbn, 15 tbc
  
      Metadata:
  
        strn            : Camtasia Producer_render549ab1f.avi Video #1
  
      Stream #0.1: Audio: pcm_s16le, 12000 Hz, 1 channels, s16, 192 kb/s
  
      Metadata:
  
        strn            : Microsoft Waveform: Camtasia Producer_render549ab1f.wav
  
  [libx264 @ 0x1202e40]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
  
  [libx264 @ 0x1202e40]profile Constrained Baseline, level 2.2
  
  [libx264 @ 0x1202e40]264 - core 107 - H.264/MPEG-4 AVC codec - Copyleft 2003-2010 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0x1:0 me=dia subme=0 psy=1 psy_rd=0.00:0.00 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=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=200 ratetol=2.5 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.41 aq=0
  
  Output #0, mp4, to 'test2.mp4':
  
    Metadata:
  
      encoder         : Lavf52.64.2
  
      Stream #0.0: Video: libx264, yuv420p, 640x480, q=10-51, 200 kb/s, 15 tbn, 15 tbc
  
      Metadata:
  
        strn            : Camtasia Producer_render549ab1f.avi Video #1
  
      Stream #0.1: Audio: libfaac, 12000 Hz, 2 channels, s16, 5 kb/s
  
      Metadata:
  
        strn            : Microsoft Waveform: Camtasia Producer_render549ab1f.wav
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1

  and result of executing

  frame= 7028 fps= 52 q=10.0 Lsize=    2654kB time=468.31 bitrate=  46.4kbits/s
  
  video:1883kB audio:672kB global headers:0kB muxing overhead 3.876805%
  
  [libx264 @ 0xe1ee40]frame I:29    Avg QP:10.83  size: 25781
  
  [libx264 @ 0xe1ee40]frame P:6999  Avg QP:10.08  size:   169
  
  [libx264 @ 0xe1ee40]mb I  I16..4: 80.1%  0.0% 19.9%
  
  [libx264 @ 0xe1ee40]mb P  I16..4:  0.2%  0.0%  0.0%  P16..4:  0.2%  0.0%  0.0%  0.0%  0.0%    skip:99.6%
  
  [libx264 @ 0xe1ee40]final ratefactor: 5.71
  
  [libx264 @ 0xe1ee40]coded y,uvDC,uvAC intra: 37.1% 3.3% 3.1% inter: 0.1% 0.0% 0.0%
  
  [libx264 @ 0xe1ee40]i16 v,h,dc,p: 87% 12%  1%  0%
  
  [libx264 @ 0xe1ee40]i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 23% 27%  8%  6%  3%  3%  2%  8%
  
  [libx264 @ 0xe1ee40]i8c dc,h,v,p: 94%  6%  0%  0%
  
  [libx264 @ 0xe1ee40]kb/s:32.91