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• ffmpeg - when cutting video, last frame is green [on hold]

  4 juillet 2016, par Mister Fresh

  In a php web app, the user can upload a video and cut it in samples. Php launches a shell command with shell_exec() to start ffmpeg and cut the video.

  It works except that the last frame shows a green splash in the cut sample.

  Server is on linux. In dev environment (mac) with latest ffmpeg, the problem cannot be reproduced.

  Command is the following :

  ffmpeg -i /var/www/user_dir/web/projects/127472/cuts/1146 -ss 00:00:45 -t 15 -vcodec libx264 -s 640x360 -strict experimental -v quiet -y /var/www/user_dir/web/projects/127472/cuts/sample1954_small.mp4

  Console output :

  ffmpeg version 0.8.17-6:0.8.17-1, 
  
  
  
  Copyright (c) 2000-2014 the Libav developers
  
  
  
  built on Mar 15 2015 17:00:31 with gcc 4.7.2
  
  
  
  configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.17-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
  
  
  libavutil    51. 22. 3 / 51. 22. 3
  
  
  
  libavcodec   53. 35. 0 / 53. 35. 0
  
  
  
  libavformat  53. 21. 1 / 53. 21. 1
  
  
  
  libavdevice  53.  2. 0 / 53.  2. 0
  
  
  
  libavfilter   2. 15. 0 /  2. 15. 0
  
  
  
  libswscale    2.  1. 0 /  2.  1. 0
  
  
  
  libpostproc  52.  0. 0 / 52.  0. 0
  
  
  
  The ffmpeg program is only provided for script compatibility and will be removed
  
  in a future release. It has been deprecated in the Libav project to allow for
  
  incompatible command line syntax improvements in its replacement called avconv
  
  (see Changelog for details). Please use avconv instead.
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/user_dir/web/projects/127472/cuts/1146':
  
  
  
  Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.15.103
  
      genre           : Blues
  
  
  
  Duration: 00:01:29.47, start: 0.036281, bitrate: 808 kb/s
  
  
  
  Stream #0.0(und): Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 675 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
  Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 128 kb/s
  
  [buffer @ 0x30a2ca0] w:1920 h:1080 pixfmt:yuv420p
  
  [scale @ 0x309bf00] w:1920 h:1080 fmt:yuv420p -> w:640 h:360 fmt:yuv420p flags:0x4
  
  [libx264 @ 0x30a3200] using SAR=1/1
  
  [libx264 @ 0x30a3200] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 0x30a3200] profile Main, level 3.0
  
  [libx264 @ 0x30a3200] 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=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=1.25 aq=1:1.00
  
  
  
  Output #0, mp4, to '/var/www/user_dir/web/projects/127472/cuts/sample1954_small.mp4':
  
  
  
  Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      genre           : Blues
  
      encoder         : Lavf53.21.1
  
  
  
  Stream #0.0(und): Video: libx264, yuv420p, 640x360 [PAR 1:1 DAR 16:9], q=-1--1, 25 tbn, 25 tbc
  
  
  
  Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 200 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  
  
  Press ctrl-c to stop encoding
  
  
  
  [buffer @ 0x30a2ca0] Buffering several frames is not supported. Please consume all available frames before adding a new one.
  
  
  
  Last message repeated 1124 times 565kB time=12.80 bitrate= 361.7kbits/s    ts/s    
  
  frame=  375 fps= 17 q=28.0 Lsize=     742kB time=14.96 bitrate= 406.4kbits/s    
  
  video:360kB audio:371kB global headers:0kB muxing overhead 1.515374%
  
  frame I:3     Avg QP:16.97  size:  6922
  
  
  
  [libx264 @ 0x30a3200] frame P:158   Avg QP:24.40  size:  1858
  
  
  
  [libx264 @ 0x30a3200] frame B:214   Avg QP:28.69  size:   253
  
  
  
  [libx264 @ 0x30a3200] consecutive B-frames: 13.9% 28.3%  5.6% 52.3%
  
  
  
  [libx264 @ 0x30a3200] mb I  I16..4: 70.8%  0.0% 29.2%
  
  
  
  [libx264 @ 0x30a3200] mb P  I16..4:  4.8%  0.0%  1.6%  P16..4: 16.0%  3.9%  2.0%  0.0%  0.0%    skip:71.9%
  
  
  
  [libx264 @ 0x30a3200] mb B  I16..4:  0.5%  0.0%  0.1%  B16..8: 11.1%  0.7%  0.1%  direct: 0.1%  skip:87.4%  L0:44.2% L1:44.7% BI:11.1%
  
  
  
  [libx264 @ 0x30a3200] coded y,uvDC,uvAC intra: 19.3% 30.9% 23.5% inter: 2.3% 2.3% 1.3%
  
  
  
  [libx264 @ 0x30a3200] i16 v,h,dc,p: 39% 47%  2% 12%
  
  
  
  [libx264 @ 0x30a3200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 25% 32%  5%  5%  3%  4%  3%  3%
  
  
  
  [libx264 @ 0x30a3200] i8c dc,h,v,p: 51% 40%  7%  2%
  
  
  
  [libx264 @ 0x30a3200] Weighted P-Frames: Y:0.0% UV:0.0%
  
  
  
  [libx264 @ 0x30a3200] ref P L0: 63.7%  4.9% 19.3% 12.1%
  
  
  
  [libx264 @ 0x30a3200] ref B L0: 67.6% 32.4%
  
  
  
  [libx264 @ 0x30a3200] kb/s:196.48

• high memory & cpu usage in ffmpeg C sample when muxing audio and video

  24 juin 2016, par chandu

  I am using the muxing.c example provided with ffmpeg 3.0 version to create an MP4 file (H.264 & AAC) with VS 2013.

  The sample is working fine with default width & height for video, but when I changed the width to 1920 and height to 1080, the sample is taking nearly 400MB & 60-70% cpu usage (using task manager & in Release mode) throughout the program. I have used multi threading also.

  I tried to free the encoded packet after calling write_frame(), but to no success.
  The memory is being released only after calling avcodec_close().

  Could anybody please tell me what I am doing wrong ?

  I am adding link (https://drive.google.com/open?id=0B75_-V7se7tmWUhyM0ItS0kzUVk) to code I tested with VS 2013.

  The screenshot link https://drive.google.com/open?id=0B75_-V7se7tmVm4tUjFtSnNNSHc

  The STREAM_DURATION value in the sample is set to 120 seconds (even tested with 600 seconds) and I changed default Height & Width values of AVCodecContext in add_stream function for video type to 1080 & 1920 respectively. Through out program, it is taking 355 MB, not changing at all. I think, once frame is encoded using avcodec_encode_video2 and written to the file, the memory should be released.

  Please correct me if I am wrong.

• AVCodecContext settings for H264 (1080i)

  23 septembre 2013, par moose

  I'm trying to configure x264 for 1080i capturing. Most of these settings below are found in different examples. However, compiled together they don't work. ffmpeg API reports no error, but avcodec_encode_video() always returns zero.

  Some of the numbers are strange to me... for example, gop_size. Isn't 250 too high ?

  Event you can't offer the final answer, I'm still interested in any kind of comment on this subject.

  pCodecContext->codec_type              = AVMEDIA_TYPE_VIDEO;
  
  pCodecContext->codec_id                = CODEC_ID_H264;
  
  
  
  pCodecContext->coder_type              = FF_CODER_TYPE_AC;
  
  pCodecContext->flags                  |= CODEC_FLAG_LOOP_FILTER | CODEC_FLAG_INTERLACED_ME | CODEC_FLAG_INTERLACED_DCT;
  
  pCodecContext->me_cmp                 |= 1;
  
  pCodecContext->partitions             |= X264_PART_I8X8 | X264_PART_I4X4 | X264_PART_P8X8 | X264_PART_B8X8;
  
  pCodecContext->me_method               = ME_UMH;
  
  pCodecContext->me_subpel_quality       = 8;
  
  pCodecContext->me_range                = 16;
  
  
  
  pCodecContext->bit_rate                = 10 * 1024 * 1024; // 10 Mbps??
  
  pCodecContext->width                   = 1920;
  
  pCodecContext->height                  = 1080;
  
  
  
  pCodecContext->time_base.num           = 1;    // 25 fps
  
  pCodecContext->time_base.den           = 25;   // 25 fps
  
  
  
  pCodecContext->gop_size                = 250; // 250
  
  pCodecContext->keyint_min              = 25;
  
  pCodecContext->scenechange_threshold   = 40;
  
  pCodecContext->i_quant_factor          = 0.71f;
  
  pCodecContext->b_frame_strategy        = 1;
  
  pCodecContext->qcompress               = 0.6f;
  
  pCodecContext->qmin                    = 10;
  
  pCodecContext->qmax                    = 51;
  
  pCodecContext->max_qdiff               = 4;
  
  pCodecContext->max_b_frames            = 3;
  
  pCodecContext->refs                    = 4;
  
  pCodecContext->directpred              = 3;
  
  pCodecContext->trellis                 = 1;
  
  pCodecContext->flags2                 |= CODEC_FLAG2_WPRED | CODEC_FLAG2_MIXED_REFS | CODEC_FLAG2_8X8DCT | CODEC_FLAG2_FASTPSKIP;  // wpred+mixed_refs+dct8x8+fastpskip
  
  pCodecContext->weighted_p_pred         = 2; // not implemented with interlaced ??
  
  pCodecContext->crf                     = 22;
  
  
  
  pCodecContext->pix_fmt                 = PIX_FMT_YUV420P;
  
  
  
  pCodecContext->thread_count            = 0;