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• Can't decode HEVC video with DXVA2 and ffmpeg

  10 mai 2018, par Igor

  I can’t use DXVA2 hardware acceleration for decoding of HEVC video with ffmpeg. DXVA2 for H.264 works fine.

  I compiled an official example hw_decode.c from ffmpeg sources :

  https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/hw_decode.c

  When I call av_send_packet() it performs a callback assigned in AVCodecContext->get_format and returns only AV_PIX_FMT_YUV420P for HEVC video instead of AV_PIX_FMT_DXVA2_VLD for all H.264 videos. So HW decoding doesn’t work.

  Software decoding of HEVC works without problems.

  MPC-HC plays fine HEVC video with DXVA2 (CPU loading is low and Task Manager shows work of Video decoder in GPU details). My video card is Geforce 1060.

• process.waitFor() return 1 for drwatext using java but able to run in command prompt

  10 mars 2014, par Nikita

  I am adding the text using to the video using ffmpeg drawtext. when running the command through command prompt it works fine but when running it using process builder its not working neither getting any exception.

  Following is the java code

  • the input & ouput videopaths are coming as a parameters. ffmpegUrl
    is the path of ffmpeg in the system.

    String names = "Nikita Sahu" ;

    ProcessBuilder builder = new ProcessBuilder(ffmpegUrl," -y -i ",videoFile.getAbsolutePath()," -acodec libmp3lame -vcodec msmpeg4 -b:a 192k -b:v 1000k -ar 44100 -vf \"drawtext=text=",names,":expansion=normal:fontfile=",fontTypeFilePath,":y=h-line_h:x=h-(2*lh)-n:fontcolor=white:fontsize=24:box=0\" -an ",convertedVideoFile.getAbsolutePath());

  I am not able to find out what i am doing wrong.
  When printing the same on console & running through command prompt it works fine.
  Any help will be appreciated.

• How to set ffmpeg reconnect or quit when rtsp stream connection breaks

  8 février, par hate29

  I use ffmpeg to save rtsp stream from my wi-fi camera. It works fine but when connection dies, I don't get any notice or it doesn't reconnect automatically. Here's my command :

  


  screen -S garage ffmpeg -hide_banner -y -loglevel error -rtsp_transport tcp -use_wallclock_as_timestamps 1 -i rtsp://user:password@192.168.XXX.XXX:XXX/stream1 -vcodec copy -acodec copy -f segment -reset_timestamps 1 -segment_time 14400 -segment_format mkv -segment_atclocktime 1 -strftime 1 garage%Y%m%dT%H%M%S.mkv


  


  I found this code from this site (if I remember correctly), tinkered a little (added screen -S) and got it working fine. Now I check my stream every morning by looking saved files and are they in realtime. If yes, then I know that stream is working. Needless to say that this is quite cumbersome technique.

  


  So what I need is that the stream reconnects if it fails to connect. This would be best. Second best option would be that it kills screen. Now it just seems do its job even if its not recording anything. I think the connection breaks from time to time because wi-fi is what it is. For that I can't do anything.