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• ffmpeg streaming to youtube slow

  1er avril 2017, par boygiandi

  I’m trying to send a video file to youtube as livestreaming. The stream command look like this

  ffmpeg -re -i "/tmp/4745.mkv" -acodec aac -pix_fmt yuv420p -bufsize 6000k -vb 400k -maxrate 1500k -deinterlace -vcodec libx264 -preset fast -g 60 -r 30 -crf 1 -f flv "rtmp ://...."

  The last line of output log look like this

  [ sh : 2017-04-01 7:19:54 ]size= 242706kB time=00:21:08.11 bitrate=1567.9kbits/s speed=0.882x

  As I understand, the speed=0.882x mean it send data to youtube slower than expected ( 1x mean streaming fine, lower mean buffering ). I tried to change some params of ffmpeg command, like change -preset fast to superfast, ultrafast : it faster but quality very bad and I still can’t control the out put speed. Sometime it’s 1x, sometime lower.
  Note that I run more than 1 ffmpeg instants at the same time, it may problem of CPU, RAM or Network, I checked them all.

  • CPU 40% ( top command )
  • RAM used 3Gb/7Gb
  • Network upload Avg : 8.45 MBit/s ( Max Upload : 70.76 Mbit/s - speedtest )

  So I don’t know what’s problem. Anyone can help ?

• Displaying the current frame of a video after skipping using drawtext/start_number not evaluation any variables

  30 mars 2017, par DJ Quardaboff

  I would like to display the current frame number on a video while playing it with ffplay. I have already seen this solution, but when I seek to any part of the video, the counter resets. There’s a variable, start_number, which the ffplay documentation says is The starting frame number for the n/frame_num variable. The default value is "0". It seems that n is set to that when starting the video or seeking between I-frames. I thought setting this variable to %{floor(t*60)} would solve my problem, but after running this :

  ffplay -i "video.mp4" -vf drawtext="fontsize=30:box=1:boxcolor=white:fontcolor=black:fontfile=/Windows/Fonts/arial.ttf:start_number=floor(t*60):text=%{n}"

  I got the following console output :

  ffplay version N-84679-gd65b595 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 51.100 / 55. 51.100
  
    libavcodec     57. 86.103 / 57. 86.103
  
    libavformat    57. 67.100 / 57. 67.100
  
    libavdevice    57.  3.101 / 57.  3.101
  
    libavfilter     6. 78.100 /  6. 78.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':=    0B f=0/0
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2017-03-30T02:49:20.000000Z
  
      encoder         : Open Broadcaster Software v0.659b
  
    Duration: 00:05:36.85, start: 0.000000, bitrate: 72636 kb/s
  
      Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 162 kb/s (default)
  
      Metadata:
  
    creation_time   : 2017-03-30T02:49:20.000000Z
  
    handler_name    : Sound Media Handler
  
  Stream #0:1(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-1), 2560x1440, 72465 kb/s, 60 fps, 60 tbr, 1k tbn, 120 tbc (default)
  
  Metadata:
  
    creation_time   : 2017-03-30T02:49:20.000000Z
  
    handler_name    : Video Media Handler
  
    encoder         : AVC Coding
  
  [drawtext @ 00000000122770e0] [Eval @ 0000000008f3eb60] Undefined constant or missing '(' in 't*60)'
  
  [drawtext @ 00000000122770e0] Unable to parse option value "floor(t*60)"
  
  [drawtext @ 00000000122770e0] [Eval @ 0000000008f3ebd0] Undefined constant or missing '(' in 't*60)'
  
  [drawtext @ 00000000122770e0] Unable to parse option value "floor(t*60)"
  
  [drawtext @ 00000000122770e0] Error setting option start_number to value floor(t*60).
  
  [Parsed_drawtext_0 @ 000000000263eca0] Error applying options to the filter.
  
  Error initializing filter 'drawtext' with args 'fontsize=30:box=1:boxcolor=white:fontcolor=black:fontfile=/Windows/Fonts/arial.ttf:start_number=floor(t*60):text=%{n}'
  
     0.01 A-V:    nan fd=   0 aq=   22KB vq= 5866KB sq=    0B f=0/0

  In fact, any variable in start_number’s assignment invokes this error. I don’t know if I have the correct syntax, but does this mean it doesn’t evaluate expressions ? Or maybe it doesn’t accept variables for some reason ?

  After that downer I tried just setting the text to %{t}, which played the video, but repeatedly gave this error and had no text in the top left corner :

  [Parsed_drawtext_0 @ 0000000003e54ea0] %{t} is not known 0B f=0/0

  So does the current time variable just not work in drawtext ?
  Is there another way to write the current frame on the video or even on the console window ?

  Using Windows 10 Enterprise and the latest build of ffplay for windows at this time.

• Splicing two gifs together every other frame using ffmpeg

  30 juillet 2021, par Alexwall

  I have two gifs I want to be combined together in an odd fashion.

  


  If I have gif1.gif and gif2.gif i want one frame of gif2.gif inserted every other frame of gif1.gif, in a sort of zipper like way if that makes sense.

  


  Is this feasible ? Is ffmpeg maybe not the right software to use for this ?