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• How to process a video's equal parts concurrently in Python

  5 mai 2020, par ikonuk

  There is a video file and four equally divided parts with FFMPEG but i want to process video without cutting them with FFMPEG to be more dynamic. I just want to logically divide a video and send them to p.map() function without everytime creating video parts in my project file.
Here is my code ;

  



  ...
if __name__ == '__main__':
    with Pool(4) as p:
        p.map( function , ['video-0.mp4','video-1.mp4','video-2.mp4','video-3.mp4' ])

def function(video):
    camera = cv2.VideoCapture(video)
    ...


  



  Is it possible to send equally determined parts to this function without cutting them ?

  


• hwcontext_vulkan : support user-provided pools

  15 mai 2020, par Lynne

  hwcontext_vulkan : support user-provided pools
  If an external pool was provided we skipped all of frames init,
  
  including the exec context.
  

  • [DH] libavutil/hwcontext_vulkan.c

• Why is ffmpeg trying to produce both h.264 as well as h.265 ?

  7 mars 2018, par hydra3333

  I think I only ask for h.265 output, but the output loge below seems to indicate it is trying to produce 2 video streams as output.

  "C:\SOFTWARE\ffmpeg\0-homebuilt-x64\built_for_generic_opencl\x64_8bit\ffmpeg.exe" -hide_banner -v verbose  -threads 0 -i "G:\HDTV\0nvencc\test-mp4-03\ABC HD interlaced.aac.mp4" -t 15 -threads 0 -an  -sws_flags lanczos+accurate_rnd+full_chroma_int+full_chroma_inp -filter_complex "[0:v]yadif=0:0:0" -pixel_format yuv420p -pix_fmt yuv420p -strict -1 -f yuv4mpegpipe - 2> .\zzz1.h265.txt 
  
  | "C:\SOFTWARE\ffmpeg\0-homebuilt-x64\built_for_generic_opencl\x64_8bit\ffmpeg.exe" -strict -1 -hide_banner -v verbose  -threads 0 -i - -strict -1 -c:v:0 libx265 -crf 28 output.mp4 -an  -y .\zzz.h265.mp4 2> .\zzz2.h265.txt 
  
  
  
  -----------------------------
  
  <snip to="to" make="make" code="code" block="block" smaller="smaller">
  
      Stream mapping:
  
        Stream #0:0 (h264) -> yadif
  
        yadif -> Stream #0:0 (wrapped_avframe)
  
      Press [q] to stop, [?] for help
  
      [h264 @ 000001b78ca87c00] Reinit context to 1920x1088, pix_fmt: yuv420p
  
      [graph 0 input from stream 0:0 @ 000001b78ca264c0] w:1920 h:1080 pixfmt:yuv420p tb:1/90000 fr:25/1 sar:1/1 sws_param:flags=2
  
  </snip>

  Output file #0 (pipe:):
  
    Output stream #0:0 (video): 2 frames encoded; 2 packets muxed (1072 bytes); 
  
    Total: 2 packets (1072 bytes) muxed
  
  Conversion failed!
  
  -----------------------------
  
  Routing option strict to both codec and muxer layer
  
      Last message repeated 1 times
  
  Input #0, yuv4mpegpipe, from 'pipe:':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo, 1 reference frame (I420 / 0x30323449), yuv420p(progressive, left), 1920x1080, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> hevc (libx265))
  
    Stream #0:0 -> #1:0 (rawvideo (native) -> h264 (libx264))
  
  [graph 0 input from stream 0:0 @ 0000027f5ebefa00] w:1920 h:1080 pixfmt:yuv420p tb:1/25 fr:25/1 sar:1/1 sws_param:flags=2
  
  x265 [info]: HEVC encoder version 2.7613d9f443769
  
  x265 [info]: build info [Windows][GCC 7.3.0][64 bit] 8bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  x265 [info]: Main profile, Level-4 (Main tier)
  
  x265 [info]: Thread pool created using 8 threads
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 3 / wpp(17 rows)
  
  -----------------------------