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• Stream webcam using ffmpeg/avconv to RTMP libx264 doesn't work

  15 mars 2016, par Erez Posner

  i have been trying to stream my webcam to Ustream using RTMP.

  using the standard command works great :

  "avconv -f video4linux2 -r 25 -s 320x240 -i /dev/video0 -f flv rtmp ://host/pass"

  but i encoutner a 15 seconds latency !
  therefore i decided to compress the video using libx264.
  i downloaded it and confirmed it is installed properly.
  but when running this command :

  "avconv -f video4linux2 -r 25 -s 320x240 -i /dev/video0 -c:v libx264 -pix_fmt yuv420p-f flv rtmp ://host/pass"

  on ffmpeg i get "Illegal instruction"
  and under avconv it starts to stream but nothing is shown in Ustream channel.

  output from avconv command

  avconv version 9.14-6:9.14-1rpi1rpi1, Copyright (c) 2000-2014 the
  
  Libav developers
  
  built on Jul 22 2014 15:08:12 with gcc 4.6 (Debian 4.6.3-14+rpi1)
  
  [video4linux2 @ 0x709740] The driver changed the time per frame from 1/5 to 1/30
  
      [video4linux2 @ 0x709740] Estimating duration from bitrate, this may
  
      be inaccurate
  
      Input #0, video4linux2, from '/dev/video0':
  
        Duration: N/A, start: 5069.991764, bitrate: 36864 kb/s
  
          Stream #0.0: Video: rawvideo, yuyv422, 320x240, 36864 kb/s, 1000k    tbn, 30 tbc
  
      [libx264 @ 0x70a9e0] using cpu capabilities: none!
  
      [libx264 @ 0x70a9e0] profile High, level 1.2
  
      [libx264 @ 0x70a9e0] 264 - core 130 r2282 1db4621 - H.264/MPEG-4 AVC
  
      codec - Copyleft 2003-2013 - 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=1 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=5 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, flv, to
  
      'rtmp:host/pass:
  
        Metadata:
  
          encoder         : Lavf54.20.4
  
          Stream #0.0: Video: libx264, yuv420p, 320x240, q=-1--1, 1k tbn, 5 tbc
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
      Press ctrl-c to stop encoding
  
      frame=   44 fps=  3 q=23.0 size=      26kB time=0.20
  
      bitrate=1071.8kbits/s    bits/s

  what could be the problem ?
  thank you in advanced

• 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

• Remove Rotate metadata from mp4

  2 avril 2014, par mbajur

  I'm trying to remove or modify a rotate param from my mp4 file using ffmpeg. Based on some google results, i've ended up with such command (i've tried a few more but none of them worked) :

  $ ffmpeg -i ./source.mp4 -metadata rotate=0 ./output.mp4

  But it's not working at all. The rotate=270 metadata param is still there in the output file. Can you please advise me on how it should be done ?

  I'm using

  ffmpeg version 1.2.4 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Dec  9 2013 20:00:03 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid

  ---

  Output :

  ffmpeg version 1.2.4 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Dec  9 2013 20:00:03 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/michal/Downloads/mp4_c8ffe9a587b126f152ed3d89a146b445.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.63.104
  
    Duration: 00:00:13.80, start: 0.021333, bitrate: 437 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 313 kb/s, 7.50 fps, 7.50 tbr, 15360 tbn, 15 tbc
  
      Metadata:
  
        rotate          : 270
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 134 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  File '/Users/michal/Desktop/mp4.mp4' already exists. Overwrite ? [y/N] y 
  
  using SAR=1/1
  
  [libx264 @ 0x7fb17b01ec00] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 0x7fb17b01ec00] profile High, level 2.2
  
  [libx264 @ 0x7fb17b01ec00] 264 - core 125 - 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=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=7 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 '/Users/michal/Desktop/mp4.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      rotate          : 0
  
      encoder         : Lavf54.63.104
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 15360 tbn, 7.50 tbc
  
      Metadata:
  
        rotate          : 270
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libfaac)
  
  Press [q] to stop, [?] for help
  
  frame=   99 fps= 39 q=32766.0 Lsize=     730kB time=00:00:13.80 bitrate= 433.1kbits/s    
  
  video:497kB audio:226kB subtitle:0 global headers:0kB muxing overhead 0.821272%
  
  [libx264 @ 0x7fb17b01ec00] frame I:8     Avg QP:14.85  size: 11183
  
  [libx264 @ 0x7fb17b01ec00] frame P:68    Avg QP:17.68  size:  5348
  
  [libx264 @ 0x7fb17b01ec00] frame B:23    Avg QP:18.26  size:  2419
  
  [libx264 @ 0x7fb17b01ec00] consecutive B-frames: 53.5% 46.5%  0.0%  0.0%
  
  [libx264 @ 0x7fb17b01ec00] mb I  I16..4: 31.9% 55.9% 12.1%
  
  [libx264 @ 0x7fb17b01ec00] mb P  I16..4:  8.2%  9.1%  0.3%  P16..4: 54.3% 13.0%  7.6%  0.0%  0.0%    skip: 7.4%
  
  [libx264 @ 0x7fb17b01ec00] mb B  I16..4:  0.2%  0.2%  0.0%  B16..8: 49.9%  4.0%  0.3%  direct: 8.6%  skip:36.8%  L0:45.5% L1:50.9% BI: 3.6%
  
  [libx264 @ 0x7fb17b01ec00] 8x8 transform intra:53.3% inter:90.4%
  
  [libx264 @ 0x7fb17b01ec00] coded y,uvDC,uvAC intra: 41.7% 90.1% 55.3% inter: 23.9% 56.7% 7.1%
  
  [libx264 @ 0x7fb17b01ec00] i16 v,h,dc,p: 12% 20% 10% 59%
  
  [libx264 @ 0x7fb17b01ec00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 28%  8%  8%  4%  8%  5%  5%
  
  [libx264 @ 0x7fb17b01ec00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 23% 18%  6% 11%  5%  8%  3%  3%
  
  [libx264 @ 0x7fb17b01ec00] i8c dc,h,v,p: 57% 22% 18%  4%
  
  [libx264 @ 0x7fb17b01ec00] Weighted P-Frames: Y:5.9% UV:0.0%
  
  [libx264 @ 0x7fb17b01ec00] ref P L0: 61.2%  2.2% 23.5% 12.5%  0.6%
  
  [libx264 @ 0x7fb17b01ec00] ref B L0: 74.2% 25.8%
  
  [libx264 @ 0x7fb17b01ec00] kb/s:308.34