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• after 10M ffmpeg stops saving video on nodejs

  12 mai 2016, par cauchy

  I have a nodejs server running using express (express 4). I want to save the video from a few IP cameras on a lab on request. Everything works, but if the video is too long it doesn’t get saved (the limit seems to be 11M).

  I tried using only the command line :

  ffmpeg -i rtsp://192.168.1.189:554/ch01_sub.264 -strict -2 -vcodec
  
  copy -vcodec copy test.mp4

  and this works. But I get into trouble as soon as I use node (note that this is in the node parser, no code in express. I get the same error when running the server) :

  var child_process = require('child_process');
  
  tmpProcess = child_process.spawn('ffmpeg',['-i','rtsp://192.168.1.189:554/ch01_sub.264','-strict','-2','-vcodec','copy','-vcodec','copy',"test.mp4"],{maxBuffer: 10000});

  this runs until test.mp4 is around 11M. tmpProcess is not killed, it keeps running. But after test.mp4 is of certain size I cannot play it back. I get an error saying that "This file contains no playable streams." (this is from Totem, but VLC doesn’t work either).

  Changing maxBuffer doesn’t help. I’m trying to understand what buffer am I overflooding but I cannot get much info from the manual on the api of node.

• Buffer overrun Blackmagic Intensity 4K as input to FFmpeg

  24 mai 2016, par colossus47

  I am trying to take direct video output from a 4k Sony Handycam, via HDMI directly into a Blackmagic Intensity Pro 4K. I can verify that the camera, Hdmi and blackmagic card are working as I can capture and view video using the provided "Media Express" program. When use ffmpeg I do get video output but I also get a buffer overrun.

  Here is the command :

  time ffmpeg -f decklink -i "Intensity Pro 4K@20" -c:v nvenc -b:v 100M -vf yadif=0:-1:0" -pix_fmt yuv420p -crf 29.97 -strict -2 output.mp4

  And I get the following output :

  ffmpeg version N-76538-gb83c849 Copyright (c) 2000-2015 the FFmpeg 
  
  
  
  developers built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --enable-nonfree --enable-nvenc --enable-nvresize --extra-cflags=-I../cudautils --extra-ldflags=-L../cudautils --enable-gpl --enable-libx264 --enable-libx265 --enable-decklink --extra-cflags=-I/home/tristan/Downloads/BlackmagicDeckLinkSDK10.6.5/Linux/include --extra-ldflags=-L/home/tristan/Downloads/BlackmagicDeckLinkSDK10.6.5/Linux/include
  
  libavutil      55.  5.100 / 55.  5.100
  
  libavcodec     57. 15.100 / 57. 15.100
  
  libavformat    57. 14.100 / 57. 14.100
  
  libavdevice    57.  0.100 / 57.  0.100
  
  libavfilter     6. 15.100 /  6. 15.100
  
  libswscale      4.  0.100 /  4.  0.100
  
  libswresample   2.  0.101 /  2.  0.101
  
  libpostproc    54.  0.100 / 54.  0.100
  
  [decklink @ 0x1ccd6e0] Found Decklink mode 3840 x 2160 with rate 29.97
  
  [decklink @ 0x1ccd6e0] Stream #1: not enough frames to estimate rate; consider increasing probesize
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, decklink, from 'Intensity Pro 4K@20':
  
  Duration: N/A, start: 0.000000, bitrate: 1536 kb/s
  
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  Stream #0:1: Video: rawvideo (UYVY / 0x59565955), uyvy422, 3840x2160, -5 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
  
  Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 (output.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y
  
  Output #0, mp4, to 'output.mp4':
  
  Metadata:
  
  encoder         : Lavf57.14.100
  
  Stream #0:0: Video: h264 (nvenc) ([33][0][0][0] / 0x0021), yuv420p, 3840x2160, q=-1--1, 100000 kb/s, 29.97 fps, 30k tbn, 29.97 tbc
  
  Metadata:
  
  encoder         : Lavc57.15.100 nvenc
  
  Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
  
  Metadata:
  
  encoder         : Lavc57.15.100 aac
  
  Stream mapping:
  
  Stream #0:1 -> #0:0 (rawvideo (native) -> h264 (nvenc))
  
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [decklink @ 0x1ccd6e0] Decklink input buffer overrun!:03.15 bitrate=70411.7kbits/s   
  
  Last message repeated 1 times
  
  [decklink @ 0x1ccd6e0] Decklink input buffer overrun!:03.54 bitrate=73110.9kbits/s   
  
  Last message repeated 20 times
  
  [decklink @ 0x1ccd6e0] Decklink input buffer overrun!:03.92 bitrate=76270.2kbits/s   
  
  Last message repeated 15 times
  
  [decklink @ 0x1ccd6e0] Decklink input buffer overrun!:04.28 bitrate=78367.6kbits/s   
  
  Last message repeated 61 times
  
  frame=  140 fps= 22 q=-0.0 Lsize=   57266kB time=00:00:04.67 bitrate=100425.2kbits/s   
  
  video:57187kB audio:72kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.009844%
  
  [decklink @ 0x1ccd6e0] Decklink input buffer overrun!
  
  Last message repeated 7 times
  
  [aac @ 0x1cd7020] Qavg: 215.556
  
  
  
  real   0m8.808s
  
  user   0m5.785s
  
  sys   0m1.749s

  Some sort of insight into this, be that just some commands that may fix it the issue, or otherwise.

• Merge commit ’e47b8bbf0b54599d44b9330eb4d68cdde4f6d298’

  26 juin 2016, par Hendrik Leppkes

  Merge commit ’e47b8bbf0b54599d44b9330eb4d68cdde4f6d298’
  * commit ’e47b8bbf0b54599d44b9330eb4d68cdde4f6d298’ :
  
    avcodec : Bump micro version after changing public JPEG 2000 defines
  Merged-by : Hendrik Leppkes <h.leppkes@gmail.com>
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/version.h