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• FFmpeg creating multicast with multiple streams from one source (live source)

  1er mai 2018, par Netheme

  Hi :) I’m facing problems when creating multicast with multiple streams from one source (live source). The issue is that the encoding is slower than realtime. That is big issue for me as I’m processing live feed. The exact command and it’s output you can find here :

  Command

  ffmpeg -y -hwaccel cuvid -c:v h264_cuvid -vsync 0 -deint 2 -drop_second_field 1 -surfaces 10 -i 'udp://@239.10.150.2:5004?fifo_size=100000000&bitrate=12000000'  -map i:0xc77 -r:v:0 25 -filter:v:0 fps=25,scale_npp=640:360:format=same:interp_algo=lanczos -aspect:v:0 16:9 -g:v:0 80 -vcodec:v:0 h264_nvenc -b:v:0 400K -minrate:v:0 400k -maxrate:v:0 400k  -map i:0xc77 -r:v:1 25 -filter:v:1 fps=25,scale_npp=720:405:format=same:interp_algo=lanczos -aspect:v:1 16:9 -g:v:1 80 -vcodec:v:1 h264_nvenc -b:v:1 1000K -minrate:v:1 1000k -maxrate:v:1 1000k  -map i:0xc77 -r:v:2 25 -filter:v:2 fps=25,scale_npp=1280:720:format=same:interp_algo=lanczos -aspect:v:2 16:9 -g:v:2 80 -vcodec:v:2 h264_nvenc -b:v:2 2500K -minrate:v:2 2500K -maxrate:v:2 2500K  -map i:0xc77 -r:v:3 25 -filter:v:3 fps=25,scale_npp=1920:1080:format=same:interp_algo=lanczos -aspect:v:3 16:9 -g:v:3 80 -vcodec:v:3 h264_nvenc -b:v:3 4500K -minrate:v:3 4500K -maxrate:v:3 4500K  -map i:0xc7a -ab:a:0 128k -ar:a:0 48k -acodec:a:0 aac -ac:a:0 2  -map i:0xc7b -ab:a:1 128k -ar:a:1 48k -acodec:a:1 aac -ac:a:1 2  -map i:0xc7c -ab:a:2 128k -ar:a:2 48k -acodec:a:2 aac -ac:a:2 2  -map i:0xc7d -ab:a:3 128k -ar:a:3 48k -acodec:a:3 aac -ac:a:3 2  -f mpegts "udp://@239.100.0.23:3234?overrun_nonfatal_option=1&pkt_size=1316

  And the output (speed should be 1> i hope)

  Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  
   Stream #0:0 -> #0:1 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  
   Stream #0:0 -> #0:2 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  
   Stream #0:0 -> #0:3 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  
   Stream #0:1 -> #0:4 (mp2 (native) -> aac (native))
  
   Stream #0:2 -> #0:5 (mp2 (native) -> aac (native))
  
   Stream #0:3 -> #0:6 (mp2 (native) -> aac (native))
  
   Stream #0:4 -> #0:7 (mp2 (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mpegts, to 'udp://@239.100.0.23:3234?overrun_nonfatal_option=1&pkt_size=1316':=  -0.0kbits/s speed=N/A    
  
   Metadata:
  
     encoder         : Lavf57.83.100
  
     Stream #0:0: Video: h264 (h264_nvenc) (Main), cuda, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 400 kb/s, 25 fps, 90k tbn, 25 tbc
  
     Metadata:
  
       encoder         : Lavc57.107.100 h264_nvenc
  
     Side data:
  
       cpb: bitrate max/min/avg: 400000/0/400000 buffer size: 800000 vbv_delay: -1
  
     Stream #0:1: Video: h264 (h264_nvenc) (Main), cuda, 720x405 [SAR 1:1 DAR 16:9], q=-1--1, 1000 kb/s, 25 fps, 90k tbn, 25 tbc
  
     Metadata:
  
       encoder         : Lavc57.107.100 h264_nvenc
  
     Side data:
  
       cpb: bitrate max/min/avg: 1000000/0/1000000 buffer size: 2000000 vbv_delay: -1
  
     Stream #0:2: Video: h264 (h264_nvenc) (Main), cuda, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 2500 kb/s, 25 fps, 90k tbn, 25 tbc
  
     Metadata:
  
       encoder         : Lavc57.107.100 h264_nvenc
  
     Side data:
  
       cpb: bitrate max/min/avg: 2500000/0/2500000 buffer size: 5000000 vbv_delay: -1
  
     Stream #0:3: Video: h264 (h264_nvenc) (Main), cuda, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 4500 kb/s, 25 fps, 90k tbn, 25 tbc
  
     Metadata:
  
       encoder         : Lavc57.107.100 h264_nvenc
  
     Side data:
  
       cpb: bitrate max/min/avg: 4500000/0/4500000 buffer size: 9000000 vbv_delay: -1
  
     Stream #0:4(cze): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
  
     Metadata:
  
       encoder         : Lavc57.107.100 aac
  
     Stream #0:5(eng): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
  
     Metadata:
  
       encoder         : Lavc57.107.100 aac
  
     Stream #0:6(hun): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
  
     Metadata:
  
       encoder         : Lavc57.107.100 aac
  
     Stream #0:7(ron): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
  
     Metadata:
  
       encoder         : Lavc57.107.100 aac
  
  frame= 2868 fps= 19 q=18.0 Lq=14.0 q=15.0 q=16.0 size=  134155kB time=00:01:55.88 bitrate=9484.0kbits/s speed=0.768x

  Does anyone have experiences with something like this ?

• ffmpeg - Different number of macroblocks per each frame

  18 juin 2018, par fabridigua

  i am studying the MPEG compression, in particular how are "labeled" the macroblocks with ffmpeg, using the command :

  ffmpeg -debug mb_type -i input.mp4 out.mp4

  From theory, i know that typically a macroblock is a 16x16 (pixels) block.

  So if a frame is e.g. 1920x1080 i suppose that the macroblocks are

  (1920*1080)/(16*16) = 8100

  Now, analysing the ffmpeg report, I’ve seen that for each frame there are many many less macroblocks (labelled with some "characters" indicating their type).

  Can you explain me why this happens ?
  Is a (mine) theory error ?

  I’ve seen that "visualizing" macroblocks with -debug vis_mb_type there some gray blocks.. corresponding to the (macro)blocks not satisfying any criteria ffmpeg is looking for.. maybe in my example for each frame there are

  8100 - #"gray" macroblocks

  Is this possible ? And why ?

• ffmpeg cross fade 2 pictures in 1080p

  11 mai 2018, par user3574681

  I use this command to fade 2 pictures and it work perfect with 1024 × 768 test pictures.

  ffmpeg -loop 1 -i 1-test.jpg -loop 1 -i 2-test.jpg -filter_complex "[1:v][0:v]blend=all_expr='A*(if(gte(T,3),1,T/3))+B*(1-(if(gte(T,3),1,T/3)))'" -t 4 frames_%04d.png

  But with my original pictures in 1920 × 1080 this error shows up :

  [Parsed_blend_0 @ 0x97c8240] First input link top parameters (size 1920x1080, SAR 0:1) do not match the corresponding second input link bottom parameters (1920x1080, SAR 1:1)
[Parsed_blend_0 @ 0x97c8240] Failed to configure output pad on Parsed_blend_0

  Why is this happening and how can I fix it ?
  Thank you for helping !