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• openCV - ffmpeg H264 and Webm error

  9 avril 2020, par Karthikaeyan

  I have ubuntu 16.04 LTS and OpenCV 3.4.0 Installed(Intel i5 and AMD graphics card), I need to create a browser supported video, which is playable in browser.

  



  If I'm using H264 im getting

  



  OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 27 and format 'mp4 / MP4 (MPEG-4 Part 14)' OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1' [h264_nvenc @ 0x7f4e0407f5e0] Cannot load libcuda.so.1 Could not open codec 'h264_nvenc': Unspecified error


  



  if I'm using webm VP8

  



  OpenCV: FFMPEG: tag 0x30385056/'VP80' is not supported with codec id 139 and format 'webm / WebM'


  



  if I'm using webm VP9

  



  OpenCV: FFMPEG: tag 0x30395056/'VP90' is not supported with codec id 167 and format 'webm / WebM'


  



  I'm using this code for conversion.

  



      fourcc = cv2.VideoWriter_fourcc(*'VP80')
    frame = cv2.imread(movements[0].file_path)
    height, width, _ = frame.shape
    event_video_name = video.file_name.split('.')[0] + '_eventvideo.webm'
    event_video = cv2.VideoWriter(path + event_video_name, fourcc, 5, (width, height))

    for _, image in enumerate(movements):
        image = Image.objects.get(id=image.id)
        frame = cv2.imread(image.file_path)
        event_video.write(frame)
    event_video.release()


  


• how to use ffmpeg with gpu support on macos

  26 décembre 2023, par Soroush Tayyebi

  When I exec ffmpeg command, it use my CPU to render videos, it take long time to do this job, how i can force ffmpeg use my GPU to render ?

  


  I have a macOS with AMD Radeon R9 M370X 2048 MB Graphic card. What I must install and what command i must use for this work ?

  


  I use this commands when my script run :

  


  $source_decoder = "ffmpeg -i $film_aval_source -vf drawtext=\"text_shaping=1:fontfile=$font_source:
    text='$esme_film': fontcolor=black: fontsize=$font_size: box=1: boxcolor=black@0:
    boxborderw=0: x=(w-text_w)/2: y=(h-text_h)/2 :enable='between(t,5,10)'\"  -c:a copy -force_key_frames 0:05:00,0:6:00 $film_aval_dest";

$source_decoder = "ffmpeg -i $film_aval_source -i ".$path."/Data.jpg -filter_complex '[0:v][1:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable=between(t\,5\,10)' -codec:a copy $film_aval_dest";

$convert1 = "ffmpeg -i $film_aval_dest -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra ".$path."output1.ts";

$convert_logo = "ffmpeg -i $path_tmp -i ".$main_path."/data/logo.png -filter_complex 'overlay=4:4' -codec:a copy $path_tmp2";

$convert2 = "ffmpeg -i $path_tmp2 -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra ".$path."output2.ts";
$merge = "ffmpeg -i 'concat:".$path."output1.ts|".$path."output2.ts' -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra ".$path."output_new.ts";
$convert3 = "ffmpeg -i  ".$path."output_new.ts -acodec aac -vcodec copy ".$path."video_out2.mp4";


  


  thanks

  


• How use FFMPEG multi GPU proccess

  31 janvier 2021, par R.A.M

  
I have a problem and cant find any suitable answer for it.
  
Its about use multi GPU proccess.
  
I have 3 graphic card and you could see it :

  
[![enter image description here][1]][1]


  if image not loaded use this image link : https://i.stack.imgur.com/msR83.jpg enter link description here

  

  
My problem is : when i run more than one ffmpeg command with cuda all process assigned to first GPU.
  
like below image :

  
[![enter image description here][2]][2]


  if image not loaded use this image link : https://i.stack.imgur.com/PfYfz.jpg

  


  you see ? all 6 proccess assigned to first GPU.
  
I really confused how could i fix it.
  

  
my FFMPEG code is :
  

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i my-video.mp4 \
  -vf scale_npp=w=426:h=240 -c:v h264_nvenc -profile:v main -b:v 400k -sc_threshold 0 -g 25 \
  -c:a aac -b:a 64k -ar 48000 \
  -f hls -hls_time 6 -hls_playlist_type vod \
  -hls_allow_cache 1 -hls_key_info_file encription.keyinfo \
  -hls_segment_filename f-0-seg-%d.ts f-0.m3u8


  


  i run top FFMPEG code for 6 diffrent video at same time.
  
please help to find answer. by sharing your knowledge or some links that could help me.
  
Thanks a lot.