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• Stream RTSP from ONVIF general camera to Youtube

  4 septembre 2017, par Samul

  I have a wifi camera that uses RTSP/ONVIF protocol and after reading FFMPEG docs and some threads at Google I am trying to broadcast the stream to Youtube. So I started a broadcast at youtube and in my computer in ffmpeg I executed this command :

  ffmpeg -f lavfi -i anullsrc -rtsp_transport udp -i rtsp://200.193.21.176:6002/onvif1 -tune zerolatency -vcodec libx264 -t 12:00:00 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp://x.rtmp.youtube.com/live2/private_key

  The command above looks like it’s correct cause it ouputs constantly something like this :

  

  The problem is that at YOUTUBE it still says I am offline. Why ?

• FFMPEG (Input 8K AAC -> (AAC FLV) youtube streaming noise

  17 septembre 2017, par Biswa Das

  Hello I run a streaming encoder for a non profit cause. Chosen FFMPEG as it’s very simple and doing the job near perfectly however the audio is noisy popping and cracking. Video is crystal clear.

  ffmpeg version N-86950-g1bef008 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)

  Here is my command.

  ffmpeg -rtsp_transport tcp -i $RTSP_SRC -vcodec copy -af "volume=12dB" -ar 8000 -acodec aac -f flv rtmp://a.rtmp.youtube.com/live2/$DEST_KEY

  However when I just play the stream the noise levels are quite acceptable.

  ffplay -rtsp_transport tcp -i $RTSP_SRC

  What I have tried so far.

  • Change input audio sampling from 8K to 16K (that’s all is supported currently). It made the noise problem much worse. I can’t change it to a native FLV sampling(44100 or 22050 or 11025) at least not yet, the integrated rtsp stream does not support it.)
  • My working theory is during resampling stream noise is getting boosted. So to eliminate that I tried audio copy codec even then there is no significant improvement.

• FFMpeg - moving overlay smoothly across background - ex. on Youtube

  12 septembre 2017, par techr

  Can somebody help me out with this. I was able to create a sliding video overlay on top of a background screen and moved it from point a to point b. However, the resulting video produces choppy movement. The overlay moves step at a time instead of one continous motion. Here’s an example of the code :

  ffmpeg -y -stream_loop -1 -i b.mpg -i bg.jpg -filter_complex "
  
  [0:v]scale=320:240[vid];[1][vid]overlay=x='(180+(30-180)*(t-
  
  0)/60)*between(t,0,60)+(30+(290-30)*(t-60)/60)*between(t,60,120)':y='(120+
  
  (120-120)*(t-0)/60)*between(t,0,60)+(120+(30-120)*(t-
  
  60)/60)*between(t,60,120)'[out]" -map "[out]" -r 29.97 -aspect 4:3 -b:v 
  
  4000k -minrate 4000k -maxrate 4000k -bufsize 2000k -t 64 t.mpg
  
  
  
  Input #0, mpegvideo, from 'b.mpg':
  
  Duration: 00:00:32.34, bitrate: 4000 kb/s
  
  Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 
  
  [SAR 32:27 DAR 16:9], 4000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
  
  Input #1, image2, from 'bg.jpg':
  
  Duration: 00:00:00.04, start: 0.000000, bitrate: 19637 kb/s
  
  Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 640x480, 
  
  25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
  Stream #0:0 (mpeg2video) -> scale
  
  Stream #1:0 (mjpeg) -> overlay:main
  
  overlay -> Stream #0:0 (mpeg1video)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000000002adc740] deprecated pixel format used, make sure you 
  
  did set range correctly
  
  Output #0, mpeg, to 't.mpg':
  
  Metadata:
  
  encoder         : Lavf57.73.100
  
  Stream #0:0: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 
  
  4000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc (default)
  
  Metadata:
  
  encoder         : Lavc57.99.100 mpeg1video
  
  Side data:
  
  cpb: bitrate max/min/avg: 4000000/4000000/4000000 buffer size: 2000000 
  
  vbv_delay: -1
  
  warning, clipping 1 dct coefficients to -255..255repeated 2 timesnter

  Link to video here : https://youtu.be/EE_hrjy4ilg