Newest 'ffmpeg' Questions - Stack Overflow

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  • Can some one tell me how www.catchvideo.net works ? [on hold]

    10 décembre 2015, par asmitB

    Some one please help me to understand the underlying mechanism and technology using which this video downloader website can download videos from almost all websites that have embedded video inside them.

    I had analyzed that a particular site had a shockwave player which was taking encrypted JSON as input. The video source could not be determined. But this website had actually found the source, fetched the content as stream and downloaded the video.

    Some one please tell me how this site or any other such video downloader works.

  • Translating lame arguments to ffmpeg

    10 décembre 2015, par Lewistrick

    I'm trying to translate a lame command to ffmpeg, but I'm not really sure what I'm doing. The first command is not applicable for all audio formats because LAME can't handle them. The second command yields a file that differs 1 kb from the first, but I figured that might be due to frame rate corrections and rounding. Anyway.

    Are the two following commands synonymous?

    lame -q 9 -b 16 input.wav output.mp3

    and

    ffmpeg -i input.wav -codec:a libmp3lame -compression_level 9 -b:a 16k output.mp3

  • Android ffmpeg streaming via 4G

    10 décembre 2015, par user5599807

    I'm using ffmpeg to play audio stream. it works fine when device connected to internet via 3G or WI-FI, but stopped (after ~1 second playing) in case of 4G used

  • AR.DRone C# Library [closed]

    10 décembre 2015, par Geaper on PC

    Can anyone teach me how to install this?

    https://github.com/Ruslan-B/AR.Drone

    I've tried installing many times and every time I find errors because of FFmpeg.AutoGen.

    I've tried this:

    Download the project Download x64 static ffmpeg.zeranoe(dot)com/builds/ Run the .bat file

    And nothing works. I am new in visual studio and I can't seem to put it to work. There is no detailed help on installation.

  • video after ffmpeg command conversion is not playing on windows

    10 décembre 2015, par Hemant Kumar

    I am stuck at a very weird and complex problem, hoping if anyone know the solution:

    I am converting user uploaded video using ffmpeg command on server and it was working fine as well. Today I found that if a video is recorded by a webcam from windows, is playing well in linux as well as on windows where as if user is creating a video by webcam from linux, is playing only on linux (any browser). On window it's screen either show loading icon or black screen while audio is working fine.

    I am using following codec:

    ['-strict', '-2', '-preset slow', '-maxrate 500k', '-bufsize 1000k', vfOption, '-threads 0', '-ab 64k', '-movflags faststart','-vf scale=-1:480', '-metadata:s:v:0 rotate=0', '-vcodec libx264']

    I work on linux and using html5 player on my website. I am converting video in mp4 format.

    Input:

    ffmpeg -i //stream_FE2AF05B-E630-1F7B-390B-37325B31B362.flv -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 //testing.mp4

    Output:

    ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  libavutil      52. 66.100 / 52. 66.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.102 /  2.  5.102
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, flv, from '//stream_FE2AF05B-E630-1F7B-390B-37325B31B362.flv':
  Metadata:
    canSeekToEnd    : true
  Duration: 00:00:04.04, start: 0.000000, bitrate: 636 kb/s
    Stream #0:0: Video: flv1, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
    Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
[libx264 @ 0x23c5340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x23c5340] profile High, level 5.2
[libx264 @ 0x23c5340] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '//testing.mp4':
  Metadata:
    canSeekToEnd    : true
    encoder         : Lavf55.33.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 500 kb/s, 16k tbn, 1k tbc
    Metadata:
      rotate          : 0
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (flv -> libx264)
  Stream #0:1 -> #0:1 (nellymoser -> aac)
Press [q] to stop, [?] for help
[mp4 @ 0x23c0200] Starting second pass: moving the moov atom to the beginning of the file2 drop=0    
frame= 4020 fps=706 q=-1.0 Lsize=     355kB time=00:00:04.08 bitrate= 712.0kbits/s dup=3931 drop=0    
video:271kB audio:32kB subtitle:0 data:0 global headers:0kB muxing overhead 16.957901%
[libx264 @ 0x23c5340] frame I:17    Avg QP:27.55  size:  7119
[libx264 @ 0x23c5340] frame P:1013  Avg QP:25.37  size:    88
[libx264 @ 0x23c5340] frame B:2990  Avg QP:27.32  size:    22
[libx264 @ 0x23c5340] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
[libx264 @ 0x23c5340] mb I  I16..4: 42.0% 55.1%  2.9%
[libx264 @ 0x23c5340] mb P  I16..4:  0.3%  0.4%  0.0%  P16..4:  0.6%  0.1%  0.0%  0.0%  0.0%    skip:98.6%
[libx264 @ 0x23c5340] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:35.7% L1:64.3% BI: 0.0%
[libx264 @ 0x23c5340] 8x8 transform intra:55.0% inter:84.5%
[libx264 @ 0x23c5340] direct mvs  spatial:87.6% temporal:12.4%
[libx264 @ 0x23c5340] coded y,uvDC,uvAC intra: 33.4% 51.9% 0.7% inter: 0.0% 0.1% 0.0%
[libx264 @ 0x23c5340] i16 v,h,dc,p: 26% 54% 15%  5%
[libx264 @ 0x23c5340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 16% 53%  3%  1%  2%  2%  3%  3%
[libx264 @ 0x23c5340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 13% 14%  5%  7%  7% 11%  8%
[libx264 @ 0x23c5340] i8c dc,h,v,p: 43% 31% 23%  3%
[libx264 @ 0x23c5340] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x23c5340] ref P L0: 80.9%  9.0%  6.9%  2.6%  0.7%
[libx264 @ 0x23c5340] ref B L0: 89.4%  8.6%  1.8%  0.2%
[libx264 @ 0x23c5340] ref B L1: 91.0%  9.0%
[libx264 @ 0x23c5340] kb/s:551.72

    Outout from file recorded on window:

    Input:

    ffmpeg -i //stream_window.flv -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 //testing_1.mp4

    Output:

    ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  libavutil      52. 66.100 / 52. 66.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.102 /  2.  5.102
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, flv, from '//stream_window.flv':
  Metadata:
    canSeekToEnd    : true
  Duration: 00:00:09.22, start: 0.000000, bitrate: 420 kb/s
    Stream #0:0: Video: flv1, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
    Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
[libx264 @ 0x1e09fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x1e09fc0] profile High, level 5.2
[libx264 @ 0x1e09fc0] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '//testing_1.mp4':
  Metadata:
    canSeekToEnd    : true
    encoder         : Lavf55.33.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 500 kb/s, 16k tbn, 1k tbc
    Metadata:
      rotate          : 0
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (flv -> libx264)
  Stream #0:1 -> #0:1 (nellymoser -> aac)
Press [q] to stop, [?] for help
[mp4 @ 0x1e06220] Starting second pass: moving the moov atom to the beginning of the file7 drop=0    
frame= 8936 fps=703 q=-1.0 Lsize=     771kB time=00:00:09.26 bitrate= 681.5kbits/s dup=8907 drop=0    
video:585kB audio:73kB subtitle:0 data:0 global headers:0kB muxing overhead 17.106213%
[libx264 @ 0x1e09fc0] frame I:40    Avg QP:29.54  size:  7449
[libx264 @ 0x1e09fc0] frame P:2248  Avg QP:30.88  size:    69
[libx264 @ 0x1e09fc0] frame B:6648  Avg QP:39.17  size:    22
[libx264 @ 0x1e09fc0] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
[libx264 @ 0x1e09fc0] mb I  I16..4: 36.8% 60.7%  2.5%
[libx264 @ 0x1e09fc0] mb P  I16..4:  0.2%  0.3%  0.0%  P16..4:  0.4%  0.0%  0.0%  0.0%  0.0%    skip:98.9%
[libx264 @ 0x1e09fc0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:34.2% L1:65.8% BI: 0.0%
[libx264 @ 0x1e09fc0] 8x8 transform intra:60.6% inter:87.6%
[libx264 @ 0x1e09fc0] direct mvs  spatial:72.8% temporal:27.2%
[libx264 @ 0x1e09fc0] coded y,uvDC,uvAC intra: 36.3% 62.8% 4.7% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x1e09fc0] i16 v,h,dc,p: 33% 46% 15%  7%
[libx264 @ 0x1e09fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 19% 46%  3%  1%  1%  1%  2%  4%
[libx264 @ 0x1e09fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 17% 14%  9%  4%  4%  5%  5%  7%
[libx264 @ 0x1e09fc0] i8c dc,h,v,p: 42% 31% 23%  4%
[libx264 @ 0x1e09fc0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x1e09fc0] ref P L0: 82.6%  9.9%  5.2%  1.7%  0.5%
[libx264 @ 0x1e09fc0] ref B L0: 87.1% 11.0%  1.4%  0.4%
[libx264 @ 0x1e09fc0] ref B L1: 90.3%  9.7%
[libx264 @ 0x1e09fc0] kb/s:536.03

    Can anyone figure what could be the problem?

    @LordNeckbeard: Please find the command and its output above. Thanks

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