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• FFMPEG Stream video and capture frames every x minutes

  12 octobre 2018, par guitarultimate

  I’m trying to use ffmpeg on a raspberry pi zero with a camera to stream live video and capture images every x minutes at the same time.

  I am able to do either style output (stream or save image) by itself, but when trying to split the output the stream feed always cuts out when it tries to save the image.

  I am using a command like :

  raspivid -o - -t 0 -w 1280 -h 720 -fps 30 -b 8000000 -g 30 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le \
  
  -f s16le -ac 2 -i /dev/zero \
  
  -f h264 -i pipe:0 -c:v copy -c:a aac \
  
  -ab 128k -g 30 -strict experimental \
  
  -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/{secret} \
  
  -f image2 -vf fps=1/60 img%03d.jpg 

  and receive an error message like :

  av_interleaved_write_frame(): Broken pipe
  
      Last message repeated 1 times
  
  [flv @ 0x3766930] Failed to update header with correct duration.
  
  [flv @ 0x3766930] Failed to update header with correct filesize.
  
  Error writing trailer of rtmp://a.rtmp.youtube.com/live2/{secret}: Broken pipe
  
  frame=  253 fps=6.0 q=-1.0 Lq=0.0 size=       7kB time=00:00:10.12 bitrate=   6.0kbits/s speed=0.242x
  
  video:1508kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  Running either output on it’s own with the same inputs executes perfectly fine.

  Any help on how to acheive this ?

• h264 Licensing, ffmpeg iPhone transcoding

  28 février 2013, par NadavRub

  Requirements
  
  1. An application that should run, to begin with, on iPhone, and, in the end on a plurality
   of SmartPhone devices.
  2. Aim at having the trans-coding code supporting as much OSs as possible.
  3. Application is commercial.

  Use-case
  
  I. Record video using the portable SmartPhone Camera application
  II. Trans-code the video into a plurality of bit-rates using a cutom app
  

  iPhone Implementation
  
  A. To satisfy requirement [2], Implement Trans-coding using C++
  B. Use ffmpeg for trans-coding.
  

  Problem
  - Using ffmpeg to encode H264 req usage of the x264 lib
  - H264 encoding mandate payment for Licensing.

  In order to avoid H264 Licensing
  - The iPhone device ( and many others ) come with built-in H264 encoding capability
  - Usage of the built-in H264 Codec will avoid licensing problems/restrictions
  

  ---

  Does ffmpeg, supports, in any way, usage of iPhone's built-in H264 encoder ?
  
  
  
  Any help will be appreciated.

• FFmpeg - Turn a 1280x720 video into 720x1280 video and add blur

  6 janvier 2021, par offish

  I've searched around and found multiple solutions. I've found one that works well, but the final video ends up being too big which makes the rendering slow.

  


  I'm giving it a 1280x720 video and want it to turn out like shown here with 720x1280 as the resolution.

  


  -lavfi "[0:v]scale=256/81*iw:256/81*ih,boxblur=luma_radius=min(h\,w)/40:luma_power=3:chroma_radius=min(cw\,ch)/40:chroma_power=1[bg];[bg][0:v]overlay=(W-w)/2:(H-h)/2,setsar=1,crop=w=iw*81/256"


  


  This video ends up being 1280x2274 instead of 720x1280, everything else is fine except the speed and resolution.

  


  -lavfi [0:v]scale=16/9*iw:16/9*ih,boxblur=luma_radius=min(h\,w)/40:luma_power=3:chroma_radius=min(cw\,ch)/40:chroma_power=1[bg];[bg][0:v]overlay=(W-w)/2:(H-h)/2,setsar=1,crop=w=720:h=1280


  


  This cuts the original video, but ends up being 720x1280, faster than the first solution.

  


  -lavfi "[0:v]scale=256/81*iw:256/81*ih,boxblur=luma_radius=min(h\,w)/40:luma_power=3:chroma_radius=min(cw\,ch)/40:chroma_power=1[bg];[bg][0:v]overlay=(W-w)/2:(H-h)/2,setsar=1,crop=w=iw*81/256,scale=720:1280"


  


  This is the same as the first one, but it gets scaled again. It has the correct resolution, but is way to slow for my liking (only about 3.6 it/s, when I've tried other solutions which fluctuates around 35 it/s).

  


  I guess my scaling is wrong, but I don't understand what I should multiply and divide by, to get the result I'm looking for.

  


  Thanks.