Recherche avancée

Sur d’autres sites (8510)

• FFmpeg : Get better encoding out of my function

  31 octobre 2019, par A Person

  I needed some assistance on my task.

  I am using FFmpeg to burn time and the channel name onto the video.

  My goal is to record a stream that is html5 compatible with the following settings :

  Video wrapper MP4

  Video codec H.264

  Bitrate 1Mbps

  Audio codec AAC

  Audio bitrate 128Kbps

  And GPU encoding.

  This is what I am using :

  ffmpeg -hwaccel cuvid -y -i {udp} -vf "drawtext=fontfile=calibrib.tff:fontsize=25:text='{ChannelName} %{localtime}': x=10: y=10: fontcolor=white: box=1: boxcolor=0x000000" -pix_fmt yuv420p -vsync 1 -c:v h264_nvenc -r 25 -threads 0  -b:v 1M -profile:v main -minrate 1M -maxrate 1M -bufsize 10M -sc_threshold 0 -c:a aac -b:a 128k -ac 2 -ar 44100 -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" -bsf:v h264_mp4toannexb -t 00:30:00 {output}\{ChannelName}\{ChannelName}_{year}_{monthno}_{day}__{Hours}_{Minutes}_{Seconds}.mp4

  {ChannelName}_{year}_{monthno}_{day}__{Hours}_{Minutes}_{Seconds} are all variable holding information.

  {udp} holds the UDP stream link.

  I have done it this way as I have multiple UDP stream recording.

  Although this works, is there a better way for me to do this keeping in the -vf as I need the time and channel name.

  Currently, this uses between 0.8% to 1.9% GPU on my Quadro P4000. I don’t want to use more than this as I have more than 30 streams.

• Enormous, constant memory consumption using VP9 codec in FFMPEG C++

  17 décembre 2017, par Sebastian Schon

  Using :
  https://github.com/ash3D/VideoRecorder
  Wrapped with :
  https://github.com/ash3D/UEVideoRecorder

  I added the VP9 codec to the "FindEncoder" function of the CVideoRecorder (part of the VideoRecorder repository). Using VP9 codec works generally, however the memory consumption is enormous and within a good 30 seconds, the memory usage goes up from 3GB to 6GB, upon which (round about) FFMPEG throws out of memory errors and aborts the encoding process. I started up the Diagnostics Tool of Visual Studio and it told me that avcodec.dll is holding all the memory, which is not released until the encoding is terminated (peacefully). The function within which the allocating call is executed is the CVideoRecorder::Encode() function, which inside it calls avcodec_send_frame().

  H264 and HVENC work fine with a constant memory consumption of around 300MB.

  I tried setting various settings on the VP9 codec like the bitrate, cfr and quality, none of which changed the behavior in any to me recognizable way.

• Jeu Pour Gagner un Livre Web Analytique !

  26 juillet 2012, par Piwik team — Communauté

  Un grand merci à tous ceux et celles qui ont participé à cette première semaine du Grand Jeu Concours Piwik de l’été.
  Comme vous le savez nous faisons gagner un livre par semaine à ceux qui commente cet article et nous sélectionnons alors un gagnant.
  Cette semaine c’est Steve qui remporte le livre sur Piwik, félicitations !

  Il nous reste désormais 9 livres à vous faire gagner :)

  Merci de commenter sur l’article suivant : fr.piwik.org/blog/2012/07/grand-jeu-concours-piwik-10-livres-piwik-en-francais-a-gagner/