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• dnxhddec : decode and use interlace mb flag

  25 septembre 2015, par Christophe Gisquet

  dnxhddec : decode and use interlace mb flag
  This bit is 1 in some samples, and seems to coincide with interlaced
  
  mbs and CID1260. 2008 specs do not know about it, and maintain qscale
  
  is 11 bits. This looks oversized, but may help larger bitdepths.
  Currently, it leads to an obviously incorrect qscale value, meaning
  
  its syntax is shifted by 1. However, reading 11 bits also leads to
  
  obviously incorrect decoding : qscale seems to be 10 bits.
  However, as most profiles still have 11bits qscale, the feature is
  
  restricted to the CID1260 profile.
  The encoder writes 12 bits of syntax, last and first bits always 0,
  
  which is now somewhat inconsistent with the decoder, but ends up with
  
  the same effect (progressive + reserved bit).
  Partially fixes ticket #4876.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/dnxhddec.c

• Lost video stream when streaming using FFmpeg and RTSP camera

  13 février 2019, par Vape

  on the Linux server, I have FFmpeg installed which streams video from Chinese low-cost IP camera to Twitch or Youtube server. After a few hours, the video is not visible but on the server side, the FFmpeg is still running and also the IP camera respond to the "ping" command.

  Here is the script I’m using :

  #
  
  # Camera IP
  
  #
  
  AQUARIUM_CAM_IP="192.168.123.102"
  
  
  
  
  
  #
  
  # Aquarium data file
  
  #
  
  AQUARIUM_DATA_FILE="/run/aquarium-cam/data.txt"
  
  
  
  
  
  #
  
  # FFmpeg parameters
  
  #
  
  FFMPEG_LOG_LEVEL=fatal
  
  
  
  # Bitrate (1000k = 1Mbit/s)  and  encoding speed (affects CPU)  and  number of CPU cores to use
  
  FFMPEG_VBR="1000k"
  
  FFMPEG_QUAL="ultrafast"
  
  FFMPEG_THREADS="1"
  
  
  
  # Streaming source
  
  FFMPEG_CAM_RTSP_SRC="rtsp://${AQUARIUM_CAM_IP}:554/user=admin&password=&channel=1&stream=0.sdp" # Camera source
  
  
  
  # Streaming destination
  
  FFMPEG_TWITCH_STREAM_URL_DST="rtmp://live-ber.twitch.tv/app"  # RTMP stream URL
  
  FFMPEG_TWITCH_KEY=""
  
  
  
  # Data overlay setup
  
  FFMPEG_TEXT_OVERLAY_FONT_PATH="OpenSans-Regular.ttf"
  
  FFMPEG_TEXT_OVERLAY_FONT_SIZE=25
  
  FFMPEG_TEXT_OVERLAY_OFFSET_X=5
  
  FFMPEG_TEXT_OVERLAY_OFFSET_Y=60
  
  FFMPEG_TEXT_OVERLAY_RELOAD=1
  
  FFMPEG_TEXT_OVERLAY_BOX="1"
  
  FFMPEG_TEXT_OVERLAY_BOX_BORDER_WIDTH="5"
  
  FFMPEG_TEXT_OVERLAY_BOX_COLOR="blue@0.5"

  the FFmpeg script :

   ffmpeg \
  
      -loglevel ${FFMPEG_LOG_LEVEL} -f lavfi -i anullsrc \
  
      -rtsp_transport tcp \
  
      -i "${FFMPEG_CAM_RTSP_SRC}" \
  
      -vcodec libx264 -pix_fmt yuv420p -preset ${FFMPEG_QUAL} -g 75 -b:v ${FFMPEG_VBR} \
  
      -vf "\
  
  drawtext=fontfile=${FFMPEG_TEXT_OVERLAY_FONT_PATH}:textfile=${AQUARIUM_DATA_FILE}:\
  
  x=${FFMPEG_TEXT_OVERLAY_OFFSET_X}:y=${FFMPEG_TEXT_OVERLAY_OFFSET_X}:\
  
  reload=${FFMPEG_TEXT_OVERLAY_RELOAD}: \
  
  fontcolor=white:fontsize=${FFMPEG_TEXT_OVERLAY_FONT_SIZE}:\
  
  box=${FFMPEG_TEXT_OVERLAY_BOX}:boxborderw=${FFMPEG_TEXT_OVERLAY_BOX_BORDER_WIDTH}:\
  
  boxcolor=${FFMPEG_TEXT_OVERLAY_BOX_COLOR}"\
  
      -threads ${FFMPEG_THREADS} -bufsize 512k \
  
      -f flv "${FFMPEG_TWITCH_STREAM_URL_DST}/${FFMPEG_TWITCH_KEY}"

  The other strange thing is that when the FFmpeg start and the stream begin the CPU utilization is about 30% in the case when there is no stream but the FFmpeg is still alive the CPU utilization is below 20% or less.

  Any Idea how to resolve this kind of problem ?
  Has FFmpeg some option to terminate if there is no "stream" or if it has lost a connection with a camera ?

• AWS Lambda. Error=20 (Not a directory) when moving FFmpeg to /tmp

  18 novembre 2017, par Omar Riaz

  I am using the ffmpeg-cli-wrapper to run FFmpeg from an application I upload onto AWS lambda. I was initially getting the

  error=13 Permission Denied

  when trying to call it via the wrappers ProcessBuilder. My inital solution was to chmod 755 ffmpeg before uploading, but it didn’t help.

  For information, my FFmpeg and ffprobe files are located in the following classpath : static/ffmpeg/ffmpeg and static/ffmpeg/ffprobe. They are also statically linked.

  AWS Lambda permission denied when trying to use ffmpeg

  I’ve tried to follow the instructions given in the example above, but when I try to perform either mv or cp command :Runtime.exec("mv " + pathToFFmpeg + " /tmp"), I get the

  error=20, Not a directory

  error.

  I know that I have the correct path for FFmpeg because the following command mv *pathToFFmpeg* *an arbitrary name* runs without error, meaning that the file is there and so the mv command just renames it as it’s supposed to do.