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  • capture my webcam and encode to mp4 with ffmpeg, but the x264 works bad

    17 septembre 2015, par zhangxm1991

    here is my version :
    ffmpeg version : 2.3.3
    libx264 version:142.x

    I wat to capture my video and use ffmpeg and x264 to a mp4 file. the solution is 320x240.
    But i found that the video file is so big. Then i found that the P frame and B frame is very big, even nearly equal to the I frame.I do not know why.

    here is my code :

        c->codec_id = codec_id;
    
    c->bit_rate = 400000;
    
    c->width    = 320;
    
    c->height   = 240;
    
    c->time_base.den = 10;
    
    c->time_base.num = 1;
    
    c->pix_fmt       = AV_PIX_FMT_YUV420P;

    Here is my program output :

    [libx264 @ 0xb6200fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
    

    
[libx264 @ 0xb6200fc0] profile High, level 1.3
    

    
[libx264 @ 0xb6200fc0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    

    
Output #0, mp4, to '/home/2014_09_12/0002b6429579/5/2014_09_12_18_39_12_600.mp4':
    

    
    Stream #0:0: Video: h264 (libx264), yuv420p, 320x240, q=-1--1, 400 kb/s, 10 tbc
    

    
    Stream #0:1: Audio: aac, 8000 Hz, mono, fltp, 32 kb/s
    

    
[mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
    

    
[mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
    

    
[mp4 @ 0xb62005e0] Encoder did not produce proper pts, making some up.
    

    
[libx264 @ 0xb6200fc0] frame I:3     Avg QP: 2.79  size: 72996
    

    
[libx264 @ 0xb6200fc0] frame P:383   Avg QP: 0.14  size: 54075
    

    
[libx264 @ 0xb6200fc0] frame B:216   Avg QP: 1.95  size: 64784
    

    
[libx264 @ 0xb6200fc0] consecutive B-frames: 30.1% 63.2%  6.0%  0.7%
    

    
[libx264 @ 0xb6200fc0] mb I  I16..4: 16.1% 12.7% 71.2%
    

    
[libx264 @ 0xb6200fc0] mb P  I16..4:  3.5%  5.1% 15.9%  P16..4: 20.3% 22.8% 14.0%  0.0%  0.0%    skip:18.3%
    

    
[libx264 @ 0xb6200fc0] mb B  I16..4:  0.4%  2.5%  8.2%  B16..8: 32.6% 19.8% 13.5%  
    
direct:22.2%  skip: 0.8%  L0:25.5% L1:12.8% BI:61.6%
    

    
[libx264 @ 0xb6200fc0] final ratefactor: -32.89
    

    
[libx264 @ 0xb6200fc0] 8x8 transform intra:21.0% inter:29.6%
    

    
[libx264 @ 0xb6200fc0] coded y,uvDC,uvAC intra: 100.0% 100.0% 100.0% inter: 83.3% 80.9% 80.9%
    

    
[libx264 @ 0xb6200fc0] i16 v,h,dc,p:  5%  7% 42% 46%
    

    
[libx264 @ 0xb6200fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 12% 23%  8%  6%  6%  8%  9% 14%
    

    
[libx264 @ 0xb6200fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 19% 10%  8%  8% 10% 10% 12%
    

    
[libx264 @ 0xb6200fc0] i8c dc,h,v,p: 78%  3%  4% 15%
    

    
[libx264 @ 0xb6200fc0] Weighted P-Frames: Y:0.5% UV:0.3%
    

    
[libx264 @ 0xb6200fc0] ref P L0: 43.4% 14.6% 19.0% 22.9%  0.1%
    

    
[libx264 @ 0xb6200fc0] ref B L0: 63.3% 35.7%  1.1%
    

    
[libx264 @ 0xb6200fc0] ref B L1: 97.0%  3.0%
    

    
[libx264 @ 0xb6200fc0] kb/s:4.53
    

    
[aac @ 0xb6201ba0] 2 frames left in the queue on closing

  • capture my webcam and encode to mp4 with ffmpeg, but the x264 works bad

    17 septembre 2015, par zhangxm1991

    here is my version :
    ffmpeg version : 2.3.3
    libx264 version:142.x

    I wat to capture my video and use ffmpeg and x264 to a mp4 file. the solution is 320x240.
    But i found that the video file is so big. Then i found that the P frame and B frame is very big, even nearly equal to the I frame.I do not know why.

    here is my code :

        c->codec_id = codec_id;
    
    c->bit_rate = 400000;
    
    c->width    = 320;
    
    c->height   = 240;
    
    c->time_base.den = 10;
    
    c->time_base.num = 1;
    
    c->pix_fmt       = AV_PIX_FMT_YUV420P;

    Here is my program output :

    [libx264 @ 0xb6200fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
    

    
[libx264 @ 0xb6200fc0] profile High, level 1.3
    

    
[libx264 @ 0xb6200fc0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    

    
Output #0, mp4, to '/home/2014_09_12/0002b6429579/5/2014_09_12_18_39_12_600.mp4':
    

    
    Stream #0:0: Video: h264 (libx264), yuv420p, 320x240, q=-1--1, 400 kb/s, 10 tbc
    

    
    Stream #0:1: Audio: aac, 8000 Hz, mono, fltp, 32 kb/s
    

    
[mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
    

    
[mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
    

    
[mp4 @ 0xb62005e0] Encoder did not produce proper pts, making some up.
    

    
[libx264 @ 0xb6200fc0] frame I:3     Avg QP: 2.79  size: 72996
    

    
[libx264 @ 0xb6200fc0] frame P:383   Avg QP: 0.14  size: 54075
    

    
[libx264 @ 0xb6200fc0] frame B:216   Avg QP: 1.95  size: 64784
    

    
[libx264 @ 0xb6200fc0] consecutive B-frames: 30.1% 63.2%  6.0%  0.7%
    

    
[libx264 @ 0xb6200fc0] mb I  I16..4: 16.1% 12.7% 71.2%
    

    
[libx264 @ 0xb6200fc0] mb P  I16..4:  3.5%  5.1% 15.9%  P16..4: 20.3% 22.8% 14.0%  0.0%  0.0%    skip:18.3%
    

    
[libx264 @ 0xb6200fc0] mb B  I16..4:  0.4%  2.5%  8.2%  B16..8: 32.6% 19.8% 13.5%  
    
direct:22.2%  skip: 0.8%  L0:25.5% L1:12.8% BI:61.6%
    

    
[libx264 @ 0xb6200fc0] final ratefactor: -32.89
    

    
[libx264 @ 0xb6200fc0] 8x8 transform intra:21.0% inter:29.6%
    

    
[libx264 @ 0xb6200fc0] coded y,uvDC,uvAC intra: 100.0% 100.0% 100.0% inter: 83.3% 80.9% 80.9%
    

    
[libx264 @ 0xb6200fc0] i16 v,h,dc,p:  5%  7% 42% 46%
    

    
[libx264 @ 0xb6200fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 12% 23%  8%  6%  6%  8%  9% 14%
    

    
[libx264 @ 0xb6200fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 19% 10%  8%  8% 10% 10% 12%
    

    
[libx264 @ 0xb6200fc0] i8c dc,h,v,p: 78%  3%  4% 15%
    

    
[libx264 @ 0xb6200fc0] Weighted P-Frames: Y:0.5% UV:0.3%
    

    
[libx264 @ 0xb6200fc0] ref P L0: 43.4% 14.6% 19.0% 22.9%  0.1%
    

    
[libx264 @ 0xb6200fc0] ref B L0: 63.3% 35.7%  1.1%
    

    
[libx264 @ 0xb6200fc0] ref B L1: 97.0%  3.0%
    

    
[libx264 @ 0xb6200fc0] kb/s:4.53
    

    
[aac @ 0xb6201ba0] 2 frames left in the queue on closing

  • 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

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