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• Convert YUV420 to BGR without using videoconvert in GStreamer

  23 septembre 2019, par AnD Max

  I am using GSteamer, and I want to convert I420 to BGR format.
  Pipeline :

  gst-launch-1.0 filesrc location= ./Big_Buck_Bunny_1080_10s_1MB.mp4 ! qtdemux ! h264parse ! avdec_h264 ! fakesink

  I don’t use videoconvert plugin because it takes many CPU workload.
  I saw that avdec_h264 plugins has support BGR format and I tried to chose BGR format but the output always give I420 format ("avdec_h264 ! video/x-raw, format=BGR !").

  I tried to cast it to BGR format in source code (gst-libav/ext/libav/gstavvidec.c\gst_ffmpeg_pixfmt_to_videoformat()) but I got an error in (gst-libav/gst-libs/ext/libav/libavcodec/decode.c), 1606

  for (i = 0; i < num_planes; i++) {
  
              av_assert0(frame->data[i]);
  
          }

  Does my way correct ? Should I modify num_planes in deocode.c ?
  If it’s not a right way, can I convert format by using OpenCV with GStreamer pipeline ?

  If you have any good way, please tell me also.

• avcodec/apedec : Fix several integer overflows in predictor_update_filter() and do_app...

  2 septembre 2019, par Michael Niedermayer

  avcodec/apedec : Fix several integer overflows in predictor_update_filter() and do_apply_filter()
  Fixes : negation of -2147483648 cannot be represented in type 'int' ; cast to an unsigned type to negate this value to itself
  
  Fixes : signed integer overflow : -14527961 - 2147483425 cannot be represented in type 'int'
  
  Fixes : 16380/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5645957131141120
  
  Fixes : 16968/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5716169901735936
  
  Fixes : 17074/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5198710497083392
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/apedec.c

• php ffmpeg exec & shell_exec process stops after few seconds

  6 octobre 2019, par Salem

  I’m using PHP script file with simple html interface to control FFMPEG process start and stop from the browser , the script goal is start live streaming on my server that usually runs for hours without stop (using ffmpeg and nginx-rtmp )
  my script were working perfectly until I notice recently This is strange behaviors
  here is my php script variables

  $cast =" /usr/sbin/ffmpeg -loglevel 0 -thread_queue_size 32768 -re -i '".$src."' -i /var/www/example/logo.png -r 23.976 -strict -2 480x360 -aspect 16:9 -filter_complex 'overlay=x=(main_w-overlay_w)/2:y=(main_h-overlay_h)-23' -vcodec libx264 -x264opts colormatrix=bt709 -profile:v high444 4 -b:v 290k -maxrate 290k -bufsize 250k  -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" -acodec libfdk_aac -profile:a aac_he_v2 -b:a 16k -map_metadata -1 -f flv  rtmp://localhost/hls/live 2>/dev/null >/dev/null  & " ; 
  
  $output =  shell_exec( $cast   )    ;

  It’s like FFMPEG process continue until original php process ( that call it ) die , at first I thought this issue with the sorce or ffmpeg command but I test the same command on the sell and it works perfectly .
  My suspicion are with on STDIO etc were not redirected right . even when I excute the same php script from the shell it’s do the same stops after few seconds .

  =Edit=

  Even when I tried to run ffmpeg from the command line and make it run on the background , I got same behavior the process stop after few seconds , ffmpeg continue running only if I wait for it output .

  Here my OS details :-

  DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"
  
  NAME="Ubuntu"
  
  VERSION="18.04.3 LTS (Bionic Beaver)"