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• ffmpeg encoder streaming issues

  8 août 2017, par bobsingh1

  I am trying to build ffmpeg encoder on linux. I started with a custom built server Dual 1366 2.6 Ghz Xeon CPUs (6 cores) with 16 GB RAM with Ubuntu 16.04 minimal install. Built ffmpeg with h264 and aac. I am taking live source OTA channels and encoding/streaming them with following parameters

  -vcodec libx264 -preset superfast -crf 25 -x264opts keyint=60:min-keyint=60:scenecut=-1 -bufsize 7000k -b:v 6000k -maxrate 6300k -muxrate 6000k -s 1920x1080 -format yuv420p -g 60 -sn -c:a aac -b:a 384k -ar 44100

  And I am able to successfully udp out using mpegts. My problem starts with 5th stream. The server can handle four streams and as soon as I introduce 5th stream I start seeing hiccups in output. Looking at my cpu usage using top I still see only 65% to 75% usage with occasional 80% hit. Memory usage is well within acceptable parameters. So I am wondering either top is not giving me accurate cpu usage or something is not right with ffmpeg. The server is isolated for udp in/out on a 1 Gbps network.

  I decided to up the cpu power and installed two 3.5 Ghz CPUs (6 cores) thinking it was perhaps the cpu clock. To my surprise the results were no different. So now I am wondering is there some built in limit I am hitting when I process at 1080p. If I change the resolution to 720p it is able to process 8 streams but 720 is not acceptable.
  My target is 10 1080p streams per server.
  So my questions are
  1. If I use a quad motherboard and up the cpu count to 4 (6 or 8 cores) will I get 10 1080p streams ? Is there any theoretical max I can go with ffmpeg per machine ?
  2. Do cores matter more or does clock matter more ?
  3. Any suggestions in improvement with my options. I have tried ultrafast preset but the output quality is unacceptable.

  Thanks in advance

• Combine many videos in list using FFMPEG

  2 septembre 2022, par anoor1234

  I have a bunch of videos that are MP4s with different FPS, resolution, aspect ratio, basically everything. I'm trying to see if its possible to use FFMPEG to combine them into a single 1080/720 video using a single command, or at least make them all similar format so that combining is easy. Speed and less CPU power would be preferred but I'm in no rush and

  


  I found this command on another stack overflow question :

  


  ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -filter_complex \
"[0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v0];
 [1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v1];
 [2:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v2];
 [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]" \
-map "[v]" -map "[a]" -c:v libx264 -c:a aac -movflags +faststart output.mp4


  


  The problem is that I have more that 3 videos to combine and I don't know how to work this command with more, I have an entire list of videos in a list.txt file structured as such :

  


  file './videos/video1.mp4'
file './videos/video2.mp4'
file './videos/video3.mp4'


  


  The code that somewhat worked for me was this

  


  ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4


  


  It combines the video well and fairly fast but I get weird glitches with the audio and the resolution is weird (I'm hoping for 1920x1080). I suspect this is due to the varying attributes of each video but I'm not sure. I'm familiar with Python but I have found no Python script that can do what I ask. If there any way to combine my list into one video (using FFMPEG or not) reliably ?

  


• how to stream an IP webcam (h264) to youtube live rtmp using avconv or ffmpeg ?

  20 juin 2015, par Baba

  I have an IP webcam HiSilicon Hi3516C that I can successfully access from a raspberry pi. I can get still images by using a command like this :

  avconv -i "rtsp://192.168.1.10:554" myfile.jpg

  now instead of still images I would like to stream the video to youtube live. I have configured an event in my youtube live account and gotten a stream name and a rtmp url.

  My youtube ingestion settings are :
  custom ingestion : bitrate 400kbps - 1000 kbps (360p)
  encoder : Other encoder

  my webcam specs says :
  Webcam : HiSilicon Hi3516C
  Video Encoding
   H.264 baseline profile
   H.264 main profile Level 4.0
   MJPEG/JPEG baseline
  Video Encoding Performance
   At most 2-megapixel resolution for H.264 encoding
   Real-time H.264&JPEG encoding of multiple types of
  streams : 1080p@30 fps+VGA@30 fps + JPEG snapshot
  1080p@1 fps
   Supports constant bit rate (CBR) mode and variable bit
  rate (VBR) mode.
   Supports the output bit rate ranging from 32 Kbit/s to 40
  Mbit/s.
   Encoding frame rate, ranging from 1/16 frame/s to 30
  frame/s
   Eight ROIs
   OSD overlay of eight regions before encoding

  I am not sure what command line to issue in order to properly encode and send my stream to my you tube event. So far I have tried :

  avconv  -i rtsp://192.168.1.10:554 -r 20 -b 750 -f flv rtmp://a.rtmp.youtube.com/live2

  (note that I haven’t used the stream name provided by youtube since I do not know where to specify it) this returns the following :

  [h264 @ 0x1fb0380] RTP : missed 273 packets
  [h264 @ 0x1fb0380] RTP : missed 191 packets
  [h264 @ 0x1fb0380] RTP : missed 225 packets
  [h264 @ 0x1fb0380] RTP : missed 332 packets
  [h264 @ 0x1fb0380] RTP : missed 349 packets
  [h264 @ 0x1fb0380] RTP : missed 339 packets
  [rtsp @ 0x1fac640] max_analyze_duration reached
  [rtsp @ 0x1fac640] Estimating duration from bitrate, this may be inaccurate
  Guessed Channel Layout for Input Stream #0.1 : mono
  Input #0, rtsp, from ’rtsp ://192.168.1.10:554’ :
  Metadata :
  title :
  comment : minisdp
  Duration : N/A, start : 0.040000, bitrate : N/A
  Stream #0.0 : Video : h264 (Main), yuv420p, 1920x1080, 2.23 fps, 90k tbn
  Stream #0.1 : Audio : [0][0][0][0] / 0x0000, 8000 Hz, mono
  RTMP_ReadPacket, failed to read RTMP packet header
  rtmp ://a.rtmp.youtube.com/live2 : Unknown error occurred

  I have also tried

   avconv -f h264  -i rtsp://192.168.1.10:554 -r 20 -b 750 -f flv rtmp://a.rtmp.youtube.com/live2

  which gives : rtsp ://192.168.1.10:554 : Protocol not found

  and

  avconv -rtsp_transport tcp   -i rtsp://192.168.1.10:554 -r 20 -b 750 -f flv rtmp://a.rtmp.youtube.com/live2p

  which gives :
  [rtsp @ 0xf8680] max_analyze_duration reached
  [rtsp @ 0xf8680] Estimating duration from bitrate, this may be inaccurate
  Guessed Channel Layout for Input Stream #0.1 : mono
  Input #0, rtsp, from ’rtsp ://192.168.1.10:554’ :
  Metadata :
  title :
  comment : minisdp
  Duration : N/A, start : 0.040000, bitrate : N/A
  Stream #0.0 : Video : h264 (Main), yuv420p, 1920x1080, 25 fps, 1k tbr, 90k tbn
  Stream #0.1 : Audio : [0][0][0][0] / 0x0000, 8000 Hz, mono
  RTMP_ReadPacket, failed to read RTMP packet header
  rtmp ://a.rtmp.youtube.com/live2p : Unknown error occurred

  Any hint, suggestions ?
  I know very little about, video formats, codecs and streaming in general so any help is welcome. I would not mind using ffmpeg instead if anyone knows what command to issue.