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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

  • Writing a series of images into a video file using libavcodec (ffmpeg)

    19 novembre 2013, par user2978372

    Requirements :

    I have a bunch of images (to be more specific they are 1024x768, 24bpp RGB PNG files) that I want to encode into a video files.

    And I need to use 'libavcodec' library, not 'ffmpeg' tool. (well I know they are basically same in the origin, I am emphasizing because someone may answer to use 'ffmpeg' tool, but that's not a solution what I am looking for)

    I am using h264 encoder.

    Target :
    A high quality video with equal resolution (1024 x 768), YUV420P
    each image has a duration of 1 second.
    24 fps

    Problems :
    i've tried with many different (but same resolution and bits) png images, and all have failed to output a good video.

    For some series of images, only the frames of first second was shown in a good shape, but the remaining frames was distorted and color changed (lighter).

    For some series of images, it seemed the images were zoomed-in and distorted again.

    and etc.

    Question :
    I am a total AV newbie and I need someone to verify my steps for encoding. I am total AV newbie.

    1) av_register_all()

    2) avcodec_register_all()

    3) avcodec_find_encoder()

    4) avcodec_alloc_context3()

    5) sets codec configuraton to context.

    6) avcodec_open2()

    7) opens a output file using fopen_s()

    8)

    for(int second=1; second<=10; ++seconds)
    
{
    

    
  Read a image from local using Gdiplus
    

    
  Create a gdiplus bitmap and draw the image onto this bitmap
    

    
  Get the raw byte data using LockBits
    

    
  Transfer this RGB raw byte into YUV420 frame using 'swscontext', 'sws_scale'
    

    
  for(int f=0; f<24; ++f)
    
  {
    
    av_init_packet(&pkt);
    
    pkt.data = NULL;
    
    pkt.size = 0;
    

    
    pFrame->pts = f;
    
    ret = avcodec_encode_video2(pContext, &pkt, pFrame, &got_output);
    

    
    if(got_output)
    
    {
    
        fwrite(pkt.data, 1, pkt.size, outputFile);
    
        av_free_packet(&pkt);
    
    }
    
  }
    
}
    

    
/* get the delayed frames */
    
for (got_output = 1; got_output; i++) {
    
    fflush(stdout);
    

    
    ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
    
    if (ret < 0) {
    
        fprintf(stderr, "Error encoding frame\n");
    
        exit(1);
    
    }
    

    
    if (got_output) {
    
        printf("Write frame %3d (size=%5d)\n", i, pkt.size);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    
}
    

    
close everything required

    I am sure that I misunderstood some steps using ffmpeg api. The above pseudo codes are based on the 'encoding' example of ffmpeg. which part am I doing wrong ? please can someone help me ?

    p.s sorry about broken english. english is not my natvie language. I tried my best =P

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