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• ffmpeg with -strict -2 : Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  8 juin 2018, par Bhumi Shah

  This is my command

  ffmpeg -i a.mp4 -asyncec libx264 -strict -2 -refs 6 -coder 1 -sc_threshold 40 -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -trellis 1 -b:a 128k -pass 1 -profile:v baseline -level:v 3.0 -s 1080x1920 a.mp4

  Here is the error i am getting

  ffmpeg version N-46084-gcae004cab-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 19.101 / 58. 19.101
  
    libavformat    58. 13.102 / 58. 13.102
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 22.100 /  7. 22.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2018-01-17T06:39:29.000000Z
  
    Duration: 00:00:06.04, start: 0.000000, bitrate: 872 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 2160x3840, 534 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-01-17T06:39:29.000000Z
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-01-17T06:39:29.000000Z
  
        handler_name    : Alias Data Handler
  
  File 'a.mp4' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x66327c0] frame MB size (68x120) > level limit (1620)
  
  [libx264 @ 0x66327c0] DPB size (1 frames, 8160 mbs) > level limit (0 frames, 8100 mbs)
  
  [libx264 @ 0x66327c0] MB rate (244800) > level limit (40500)
  
  [libx264 @ 0x66327c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x66327c0] ratecontrol_init: can't open stats file
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

• ffmpeg h.246 plays locally in Safari, but not when hosted on s3 bucket

  7 juin 2018, par Simon Rogers

  ffmpeg h.246 plays locally in Safari, but not when hosted on s3 bucket.

  I thought it was therefore a problem with S3, however a friend has sent me an .mp4 of the same file converted with Zencoder’s service and this works perfectly, which surely means it must be a problem with my encoding settings in ffmpeg ?

  I’m using the settings recommended for maximum compatibility :

  ffmpeg -an -i mov-input-02.mov -vcodec libx264 -filter:v scale="1400:trunc(ow/a/2)*2" -movflags +faststart -pix_fmt yuv420p -profile:v baseline mov-output-02-1400.mp4

  Additionally, the .webm files I’m converting with ffmpeg all work perfectly in Chrome, Firefox, Opera etc.!

  I would really appreciate any thoughts.

  The video that works from Zencoder has this metadata :

  major_brand     : isom
  
  minor_version   : 1
  
  compatible_brands: isomavc1mp42
  
  creation_time   : 2018-06-01T11:24:54.000000Z
  
  Duration: 00:00:10.97, start: 0.000000, bitrate: 396 kb/s
  
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 1800x1200 [SAR 1:1 DAR 3:2], 394 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
  
  Metadata:
  
    creation_time   : 2018-06-01T11:24:49.000000Z

  While my videos from ffmpeg which don’t work have this metadata :

  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf58.12.100
  
  Duration: 00:00:10.97, start: 0.000000, bitrate: 184 kb/s
  
  Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1400x932 [SAR 699:700 DAR 3:2], 182 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
    timecode        : 00:00:00:01
  
  Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
  
  Metadata:
  
    handler_name    : TimeCodeHandler
  
    timecode        : 00:00:00:01
  
  Unsupported codec with id 0 for input stream 1

  Here’s the full output from conversion :

      Tempuras-iMac:2018.06.05 tempura$ ffmpeg -an -i mov-input-01.mov -vcodec l      Tempuras-iMac:2018.06.05 tempura$ ffmpeg -an -i mov-input-02.mov -vcodec libx264 -filter:v scale="1400:trunc(ow/a/2)*2" -movflags +faststart -pix_fmt yuv420p -profile:v baseline -level 3 mov-output-02-1400.mp4 
  
      ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
        built with Apple LLVM version 8.1.0 (clang-802.0.42)
  
        configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
        libavutil      56. 14.100 / 56. 14.100
  
        libavcodec     58. 18.100 / 58. 18.100
  
        libavformat    58. 12.100 / 58. 12.100
  
        libavdevice    58.  3.100 / 58.  3.100
  
        libavfilter     7. 16.100 /  7. 16.100
  
        libavresample   4.  0.  0 /  4.  0.  0
  
        libswscale      5.  1.100 /  5.  1.100
  
        libswresample   3.  1.100 /  3.  1.100
  
        libpostproc    55.  1.100 / 55.  1.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov-input-02.mov':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 537199360
  
          compatible_brands: qt  
  
          creation_time   : 2018-05-09T09:59:58.000000Z
  
        Duration: 00:00:10.97, start: 0.000000, bitrate: 114375 kb/s
  
          Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24(progressive), 2700x1800, 113610 kb/s, SAR 1:1 DAR 3:2, 30 fps, 30 tbr, 30 tbn, 30 tbc (default)
  
          Metadata:
  
            creation_time   : 2018-05-09T09:59:58.000000Z
  
            handler_name    : Apple Alias Data Handler
  
            encoder         : Animation
  
            timecode        : 00:00:00:01
  
          Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
          Metadata:
  
            creation_time   : 2018-05-09T09:59:58.000000Z
  
            handler_name    : Apple Alias Data Handler
  
            timecode        : 00:00:00:01
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (qtrle (native) -> h264 (libx264))
  
      Press [q] to stop, [?] for help
  
      [libx264 @ 0x7fac39004200] using SAR=699/700
  
      [libx264 @ 0x7fac39004200] frame MB size (88x59) > level limit (1620)
  
      [libx264 @ 0x7fac39004200] MB rate (155760) > level limit (40500)
  
      [libx264 @ 0x7fac39004200] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
      [libx264 @ 0x7fac39004200] profile Constrained Baseline, level 3.0
  
      [libx264 @ 0x7fac39004200] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 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=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 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=1.40 aq=1:1.00
  
      Output #0, mp4, to 'mov-output-02-1400.mp4':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 537199360
  
          compatible_brands: qt  
  
          encoder         : Lavf58.12.100
  
          Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1400x932 [SAR 699:700 DAR 3:2], q=-1--1, 0.03 fps, 15360 tbn, 30 tbc (default)
  
          Metadata:
  
            creation_time   : 2018-05-09T09:59:58.000000Z
  
            handler_name    : Apple Alias Data Handler
  
            timecode        : 00:00:00:01
  
            encoder         : Lavc58.18.100 libx264
  
          Side data:
  
            cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      [mp4 @ 0x7fac39003000] Starting second pass: moving the moov atom to the beginning of the file     
  
      frame=  329 fps= 42 q=-1.0 Lsize=     248kB time=00:00:10.93 bitrate= 185.5kbits/s speed= 1.4x    
  
      video:245kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.042892%
  
      [libx264 @ 0x7fac39004200] frame I:2     Avg QP:15.82  size: 34370
  
      [libx264 @ 0x7fac39004200] frame P:327   Avg QP:16.88  size:   555
  
      [libx264 @ 0x7fac39004200] mb I  I16..4: 76.8%  0.0% 23.2%
  
      [libx264 @ 0x7fac39004200] mb P  I16..4:  0.5%  0.0%  0.2%  P16..4:  0.7%  0.2%  0.1%  0.0%  0.0%    skip:98.3%
  
      [libx264 @ 0x7fac39004200] coded y,uvDC,uvAC intra: 14.3% 0.1% 0.1% inter: 0.2% 0.0% 0.0%
  
      [libx264 @ 0x7fac39004200] i16 v,h,dc,p: 57% 39%  3%  0%
  
      [libx264 @ 0x7fac39004200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 24% 20%  2%  3%  3%  2%  3%  1%
  
      [libx264 @ 0x7fac39004200] i8c dc,h,v,p: 100%  0%  0%  0%
  
      [libx264 @ 0x7fac39004200] kb/s:182.53 

• Live Video Encoding and Streaming on a Webpage

  15 juin 2018, par Ockhius

  I am trying to show live webcam video stream on webpage and I have a working draft. However, I am not satisfied with the performance and looking for a better way to do the job.

  I have a webcam connected to Raspberry PI and a web server which is a simple python-Flask server. Webcam images are captured by using OpenCV and formatted as JPEG. Later, those JPEGs are sent to one of the server’s UDP ports. What I did up to this point is something like a homemade MJPEG(motion-jpeg) streaming.

  At the server-side I have a simple python script that continuously reads UDP port and put JPEG image in the HTML5 canvas. That is fast enough to create a perception of a live stream.

  Problems :

  • This compress the video very little. Actually it does not compress the video. It only decreases the size of a frame by formatting as JPEG.

  • FPS is low and also quality of the stream is not that good.

  • It is not a major point for now but UDP is not a secure way to stream video.

  • Server is busy with image picking from UDP. Needs threaded server design.

  Alternatives :

  • I have used FFMPEG before to convert video formats and also stream pre-recorded video. I guess, it is possible to encode(let say H.264) and stream WebCam live video using ffmpeg or avconv. (Encoding)

  Is this applicable on Raspberry PI ?

  • VLC is able to play live videos streamed on network. (Stream)

  Is there any Media Player to embed on HTML/Javascript to handle
  network stream like the VLC does ?

  • I have read about HLS (HTTP Live Stream) and MPEG-DASH.

  Does these apply for this case ? If it does,how should I use them ?

  Is there any other way to show live stream on webpage ?

  • RTSP is a secure protocol.

  What is the best practice for transport layer protocol in video
  streaming ?