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• ffmpeg produces video I cannot load on latest Safari on iOS

  3 avril 2016, par Michael Heuberger

  When I encode two videos (mp4 and webm) with these ffmpeg parameters (based on images), I cannot play the mp4 it produces on latest Safari (inside a <video></video> tag) inside my iPhone 6s using the latest iOS too :

  ffmpeg 
  
  -framerate 15.2 
  
  -f image2 
  
  -thread_queue_size 64 
  
  -i /home/michael-heuberger/abcd/frames/%d.webp 
  
  -y 
  
  -an 
  
  -vcodec libx264 
  
  -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 
  
  -crf 16 
  
  -preset fast 
  
  -profile:v baseline 
  
  -pix_fmt yuv420p 
  
  -movflags +faststart 
  
  /home/michael-heuberger/abcd/videomail_good.mp4 
  
  -vcodec libvpx 
  
  -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 
  
  -crf 8 
  
  -deadline good 
  
  -cpu-used 1 
  
  -pix_fmt yuv420p 
  
  -movflags +faststart /home/michael-heuberger/abcd/videomail_good.webm

  I think the above parameters should be solid. I am adding baseline and yuv420p, yet no luck on Safari 9. Why ?

  And here is the whole ffmpeg output (just ignore the paths to the images/videos) :

  ffmpeg stdout: ffmpeg version 2.7.6-0ubuntu0.15.10.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265 --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, image2, from '/home/michael-heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e5-f576-676eaa40-b0ac-89a86db14ea0/frames/%d.webp':
  
    Duration: 00:00:00.59, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: webp, yuv420p(tv, bt470bg/unknown/unknown), 400x300, 15.17 fps, 15.20 tbr, 15.20 tbn, 15.20 tbc
  
  [libx264 @ 0xfc2760] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0xfc2760] profile Constrained Baseline, level 2.1
  
  [libx264 @ 0xfc2760] 264 - core 146 r2555 0c21480 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=0 ref=2 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=16.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [libvpx @ 0xfc5da0] v1.4.0
  
  Output #0, mp4, to '/home/michael-heuberger/binarykitchen/code/videomail.io/var/local/uploads/videomail.io/videomail/11e5/f5/76/11e5-f576-676eaa40-b0ac-89a86db14ea0/videomail_good.mp4':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 400x300, q=-1--1, 15.20 fps, 19456 tbn, 15.20 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libx264
  
  Output #1, webm, to '/home/michael-heuberger/binarykitchen/code/videomail.io/var/local/uploads/videomail.io/videomail/11e5/f5/76/11e5-f576-676eaa40-b0ac-89a86db14ea0/videomail_good.webm':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #1:0: Video: vp8 (libvpx), yuv420p, 400x300, q=-1--1, 200 kb/s, 15.20 fps, 1k tbn, 15.20 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libvpx
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (webp (native) -> h264 (libx264))
  
    Stream #0:0 -> #1:0 (webp (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0xfc16c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    9 fps=0.0 q=-1.0 Lq=0.0 size=      62kB time=00:00:00.59 bitrate= 856.1kbits/s    
  
  video:82kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0xfc2760] frame I:1     Avg QP:15.45  size: 10341
  
  [libx264 @ 0xfc2760] frame P:8     Avg QP:15.95  size:  6442
  
  [libx264 @ 0xfc2760] mb I  I16..4: 17.1%  0.0% 82.9%
  
  [libx264 @ 0xfc2760] mb P  I16..4:  6.8%  0.0% 11.3%  P16..4: 36.7% 31.6% 10.8%  0.0%  0.0%    skip: 2.8%
  
  [libx264 @ 0xfc2760] coded y,uvDC,uvAC intra: 67.5% 60.4% 43.0% inter: 60.5% 68.4% 5.4%
  
  [libx264 @ 0xfc2760] i16 v,h,dc,p: 32% 29% 21% 18%
  
  [libx264 @ 0xfc2760] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 23% 20%  3%  4%  6%  5%  4%  3%
  
  [libx264 @ 0xfc2760] i8c dc,h,v,p: 60% 21% 14%  5%
  
  [libx264 @ 0xfc2760] ref P L0: 59.3% 40.7%
  
  [libx264 @ 0xfc2760] kb/s:836.04

  This makes it difficult for me to play videomails recorded on www.videomail.io on iOS devices.

  Am I missing something here ? Already did lots of research and tried various combinations, no luck.

  If you want to reproduce that, easy : just record a video on www.videomail.io and after that, copy the link of the recorded video page to your iPhone or just download it for local investigation.

  Any clues very welcome !

• FFmpeg command line CPU usage vs code CPU usage

  12 avril 2018, par John

  On my existing PC/IP Camera combination, the command line function

  ffmpeg -i rtsp://abcd:123456@1.2.3.4/rtspvideostream /home/pc/video.avi

  correctly writes the video stream to file and uses approximately 30% of my CPU.

  The command line function

  ffmpeg -i rtsp://abcd:123456@1.2.3.4/rtspvideostream -vcodec copy /home/pc/video.avi

  uses approximately 3% of my CPU for seemingly the same result. I assume the removal of some functionality related to the codec contributes to this CPU saving.

  Using the following standard ffmpeg initialisation :

  AVFormatContext *pFormatCtx;
  
  AVCodecContext *pCodecCtx;
  
  AVDictionary *opts = NULL;
  
  av_dict_set(&opts, "rtsp_transport", "tcp", 0);
  
  avformat_open_input(&pFormatCtx,"rtsp://abcd:123456@1.2.3.4/rtspvideostream", NULL, &opts);
  
  avformat_find_stream_info(pFormatCtx,NULL);
  
  int videoStream = -1;
  
  for(int i=0; i<(int)pFormatCtx->nb_streams; i++)
  
  {
  
    if(pFormatCtx->streams[i]->codec->codec_type== AVMEDIA_TYPE_VIDEO)
  
    {
  
      videoStream=i;
  
      break;
  
    }
  
  }
  
  pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  
  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
  avcodec_open2(pCodecCtx, pCodec, NULL)
  
  AVFrame *pFrame = av_frame_alloc();
  
  int numBytes = avpicture_get_size(AV_PIX_FMT_YUV420P, IMAGEWIDTH, IMAGEHEIGHT);
  
  uint8_t *buffer12 = (uint8_t*)av_malloc(numBytes*sizeof(uint8_t));
  
  avpicture_fill((AVPicture *)pFrame, buffer12, AV_PIX_FMT_YUV420P, IMAGEWIDTH, IMAGEHEIGHT);

  with the standard reading implementation :

  int frameFinished = 0;
  
  while(frameFinished == 0)
  
  {
  
    av_read_frame(pFormatCtx, &packet);
  
    if(packet.stream_index==videoStream)
  
    {
  
      avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
    }
  
    if( packet.duration ) av_free_packet(&packet);
  
    packet.duration = 0;
  
  }  

  correctly gets the video stream and uses approximately 30% of CPU.

  In the command-line ffmpeg implementation, the addition of the parameters ’-vcodec copy’ dramatically decreases CPU usage. I am unable to reproduce a similar drop in CPU usage for the above coding implementation.

  Assuming it is possible, how do I do it ?

• Delay in video playback. Not able to identify the cause - AWS S3 region / ffmpeg / Videojs

  17 septembre 2016, par Himansu Kisan

  We are not able to identify the cause for random behavior while playing video on our website. (Sorry, cant share a link since the videos are for registered users only)
  The videos sometimes plays instantly and sometimes it takes over 1 minute to start. Not sure what we are doing wrong.

  We are using AWS S3 Oregon region (not the closest to target region, but it is cheaper) to store video files.
  The video files are encoded using ffmpeg. Below is the syntax

  ffmpeg -i input.mts -codec:v libx264 -threads 4 -movflags +faststart -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale="trunc(oh*a/2)*2:720" "output.mp4"

  ffmpeg -i input.mts -codec:v libvpx -threads 4 -quality good -cpu-used 5 -b:v 500k -maxrate 500k -bufsize 1000k -qmin 10 -qmax 42 -vf scale="trunc(oh*a/2)*2:720" -codec:a libvorbis -b:a 128k "output.webm"

  On website, we are using Videojs 5.10.8.
  Below is the code snippet

   <video class="video-js vjs-default-skin vjs-big-play-centered" preload="none" controls="controls" poster="abcd.jpg" style="width:100%;height:100%;min-height:360px;" data-setup="{&quot;autoplay&quot;:true}">
  
  <source src="abcd.mp4" type="video/mp4"></source>
  
  <source src="adcd.webm" type="video/webm"></source>
  
  <p class="vjs-no-js">
  
      To view this video please enable JavaScript, and consider upgrading to a web browser
  
      that <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a>
  
  </p>
  
  </video>

  What are we doing wrong ? Please help us out.