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• 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 ?

• Automatic encoder selection failed for output stream #0:1

  9 juin 2018, par Rafael Lima

  I’m trying to use ffmpeg for edit some videos on android...
  It is working fine but if I try to use drawtext i get error

  the command is :

  path/ffmpeg -y -i /path/asd.mp4 -map 0 -segment_time 15 -f segment -c:v libx264 -preset veryfast -crf 30 -vf "drawtext=text='test message ':fontfile=/path/arial.ttf:box=1:boxborderw=30:boxcolor=0xE86F67@0.7:fix_bounds=true:fontcolor=0x2A363B:fontsize=32:x=0:y=h" -r 30 -force_key_frames expr:gte(t,n_forced*15) -an /path/temp%03d.mp4

  and the error is :

   ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Android (4691093 based on r316199) clang version 6.0.2 (https://android.googlesource.com/toolchain/clang 183abd29fc496f55536e7d904e0abae47888fc7f) (https://android.googlesource.com/toolchain/llvm 34361f192e41ed6e4e8f9aca80a4ea7e9856f327) (based on LLVM 6.0.2svn)
  
   configuration: --prefix=/home/rafa/Desktop/m4/build --target-os=linux --arch=i686 --cpu=i686 --cross-prefix=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/i686-linux-android- --enable-cross-compile --cc=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/clang --cxx=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/clang++ --sysroot=/home/rafa/Desktop/m4/ndk/toolchain/i686/sysroot --pkg-config=/usr/bin/pkg-config --pkg-config-flags=--static --enable-pic --enable-gpl --enable-nonfree --enable-static --disable-shared --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-doc --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libx264 --enable-libfdk-aac --enable-bsf=aac_adtstoasc --enable-librtmp --enable-zlib --enable-libfreetype --enable-openssl --enable-libfontconfig --disable-asm --disable-devices --extra-cflags=-mno-stackrealign
  
    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
  
      libswscale      5.  1.100 /  5.  1.100
  
       libswresample   3.  1.100 /  3.  1.100
  
       libpostproc    55.  1.100 / 55.  1.100
  
  
  
  
  
  
  
     major_brand     : isom
  
       minor_version   : 512
  
       compatible_brands: isomiso2avc1mp41
  
       title           : 20180226 174005
  
       artist          : Rafael Lima
  
       date            : 2018
  
       encoder         : Lavf55.49.100
  
       comment         : https://www.youtube.com/watch?v=bkzc9mLyCyo
  
     Duration: 00:03:26.94, start: 0.000000, bitrate: 4156 kb/s
  
       Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4025 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
       Metadata:
  
         handler_name    : VideoHandler
  
       Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
       Metadata:
  
         handler_name    : SoundHandler
  
   Automatic encoder selection failed for output stream #0:1. Default encoder for format segment (codec none) is probably disabled. Please choose an encoder manually.
  
   Error selecting an encoder for stream 0:1

  things to considere :
  1. I’ve checked 3 times all the paths are valid
  2. I’ve tested the same command on ffmpeg 4.0 on windows and it works [with the same video]
  3. If I remove the drawtext filter it works fine...

  I tought it ffmpeg was built without drawtext or with some error so i spent 10 days in order to build it bymyself and guarantee every dependency is ok... but at end i got the same error

  does anyone have any idea please

  ==============================
  UPDATE

  I keep testing and if I remove the quotes from the filter and use a text without spacing it works

  ex :
  drawtext=text='test_message':fontfile=/path/arial.ttf:box=1:boxborderw=30:boxcolor=0xE86F67@0.7:fix_bounds=true:fontcolor=0x2A363B:fontsize=32:x=0:y=h

  so I believe there is something related to how android is escapes quotes and simple quotes because i compiled ffmpeg with same parameters and it runs on ubuntu with spaces at the text (just need to use simple quotes)

  does anyone know about it ?

• 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