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• Unable to record video without audio in windows using ffmpeg

  20 janvier 2017, par Syam Pradeep

  I am using ffmpeg to record the desktop on windows.Everything works fine if i play the audio in PC,when i try to record without playing any audio i am not able to get the desired output file.

  Used the following command to start the recording

  "-f gdigrab -framerate 10 -i desktop -f dshow -i audio="virtual-audio-capturer" -ac 2 -ar 44100 -acodec aac -ab 192k -pix_fmt yuv420p -r 30 -vcodec h264 -crf 27 -preset ultrafast -f mp4 Recording_2017-18-1--18-42-12.mp4"

  Got the following output in cmd line

  [gdigrab @ 037abaa0] Capturing whole desktop as 1600x900x32 at (0,0)
  
  [gdigrab @ 037abaa0] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, gdigrab, from 'desktop':
  
    Duration: N/A, start: 1484893527.269157, bitrate: 460804 kb/s
  
      Stream #0:0: Video: bmp, bgra, 1600x900, 460804 kb/s, 10 fps, 1000k tbr, 1000k tbn, 1000k tbc
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, dshow, from 'audio=virtual-audio-capturer:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  [libx264 @ 052e50a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 052e50a0] profile Constrained Baseline, level 4.0
  
  [libx264 @ 052e50a0] 264 - core 148 r2744 b97ae06 - 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=12 lookahead_threads=2 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=27.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  Output #0, mp4, to 'fileName.mp4':
  
    Metadata:
  
      encoder         : Lavf57.61.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1600x900, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.70.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc57.70.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (bmp (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=N/A
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [aac @ 052e7360] Qavg: nan
  
  Exiting normally, received signal 2.

  The output file is 1 kb.

• FFMPEG error while converting flv1 (flv) -> h264 (libx264)

  3 juillet 2016, par Kalivarapu

  I am trying to covert flv format video to h264 codec with mp4 format video, but am facing the following error :

  Command I executed :

  ffmpeg -i input_video.flv -c:v libx264 output.mp4

  Error :
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  Logs :

  ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --enable-opencl --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, flv, from 'input.flv':
  
    Metadata:
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:53.32, start: 0.000000, bitrate: 787 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 500 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC), 48000 Hz, 5.1, fltp, 384 kb/s
  
  [libx264 @ 0x7ff885000c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7ff885000c00] profile High, level 1.3
  
  [libx264 @ 0x7ff885000c00] 264 - core 144 r2533 c8a773e - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=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=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
  
  [libvo_aacenc @ 0x7ff885001e00] Unable to set encoding parameters
  
  Output #0, mp4, to 'output1.mp4':
  
    Metadata:
  
      encoder         : Lavf53.24.2
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 320x240, q=-1--1, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libx264
  
      Stream #0:1: Audio: aac, 0 channels, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.41.100 libvo_aacenc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv1 (flv) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  What could be the reason for this ?

• Ffmpeg : Audio/Video mixing but no sound

  14 janvier 2014, par user2914878

  I'm trying to add an audio file to a video file generated from images with FFmpeg.

  The command i am using on a Debian distrib is this one

  ffmpeg -r 1 -i edit%0d.jpg outputName.mp4 -i Test.mp3

  The video file is created but the audio is not working .

  Output : :

  > ffmpeg version 0.8.9-6:0.8.9-1, Copyright (c) 2000-2013 the Libav developers
  
    built on Nov  3 2013 00:54:50 with gcc 4.7.2
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [image2 @ 0x2283b20] max_analyze_duration reached
  
  Input #0, image2, from 'edit%0d.jpg':
  
    Duration: 00:00:24.00, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 800x600 [PAR 1:1 DAR 4:3], 1 fps, 1 tbr, 1 tbn, 1 tbc
  
  [mp3 @ 0x22d8840] max_analyze_duration reached
  
  [mp3 @ 0x22d8840] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, mp3, from 'Test.mp3':
  
    Duration: 00:00:46.04, start: 0.000000, bitrate: 128 kb/s
  
      Stream #1.0: Audio: mp3, 16000 Hz, mono, s16, 128 kb/s
  
  [buffer @ 0x2287480] w:800 h:600 pixfmt:yuvj420p
  
  [libx264 @ 0x22d7d20] using SAR=1/1
  
  [libx264 @ 0x22d7d20] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x22d7d20] profile Main, level 3.1
  
  [libx264 @ 0x22d7d20] 264 - core 123 r2189 35cf912 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=0 b_adapt=1 b_bias=0 direct=1 weightb=0 open_gop=1 weightp=2 keyint=250 keyint_min=1 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=1.25 aq=1:1.00
  
  Output #0, mp4, to '6953289.mp4':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0: Video: libx264, yuvj420p, 800x600 [PAR 1:1 DAR 4:3], q=-1--1, 1 tbn, 1 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  frame=   24 fps= 16 q=17.0 Lsize=    1247kB time=23.00 bitrate= 444.1kbits/s
  
  video:1246kB audio:0kB global headers:0kB muxing overhead 0.079555%
  
  frame I:1     Avg QP:14.91  size: 65650
  
  [libx264 @ 0x22d7d20] frame P:23    Avg QP:14.94  size: 52587
  
  [libx264 @ 0x22d7d20] mb I  I16..4: 11.8%  0.0% 88.2%
  
  [libx264 @ 0x22d7d20] mb P  I16..4: 29.8%  0.0% 60.5%  P16..4:  6.8%  0.2%  0.3%  0.0%  0.0%    skip: 2.4%
  
  [libx264 @ 0x22d7d20] coded y,uvDC,uvAC intra: 73.2% 58.6% 49.7% inter: 9.2% 8.0% 1.2%
  
  [libx264 @ 0x22d7d20] i16 v,h,dc,p: 56% 24%  6% 14%
  
  [libx264 @ 0x22d7d20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 22% 12%  7%  7%  7%  7%  7%  7%
  
  [libx264 @ 0x22d7d20] i8c dc,h,v,p: 60% 17% 13%  9%
  
  [libx264 @ 0x22d7d20] Weighted P-Frames: Y:17.4% UV:17.4%
  
  [libx264 @ 0x22d7d20] ref P L0: 12.9%  8.0% 66.4% 12.8%
  
  [libx264 @ 0x22d7d20] kb/s:425.05

  On Windows it is working fine, i tried multiple scenarios but i can't seem to find the issue, maybe a codec problem ?

  Thank you !

  Update :

  I manage to fix it this way :

  ffmpeg -r 1 -i edit%0d.jpg -i Test.mp3 -ar 44100 -strict experimental