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• How to transcode 50 H264 Streams with FFMPEG more efficient ?

  20 juin 2019, par Kevin

  i need to (Re-)Transcode 50 Live-Streams. These streams are in H264 with 720p to 1080p and bitrates up to 10M. I just want to reduce the quality and bitrate of the streams to up to 720p with max. 2M Bitrate.

  That’s what i’m doing right now :

  ffmpeg -re -i "http://domain.tld/path/file.ext" -vcodec libx264 -preset veryfast -vf scale=-2:720 -b:v 2M -maxrate 2M -bufsize 1M -acodec libfdk_aac -f flv "rtmp://127.0.0.1:1935/live/stream_xyz"

  My Server CPU (2 x Xeon E5-2630 v3) is already at 100% with just 12 streams. I will upgrade my server to 2 x Xeon Gold 5118 next month, but i don’t think, that this will give me that much more power.

  Can someone help me, to do this more efficient ?

  Would it be more efficient / cheaper to do this with GPUs ?

  Or any other ideas, to do that as efficient and cheap as possible ?

  Thanks

• Scaling Application for video decoding using ffmpeg

  6 juillet 2020, par jasoos

  I am building an application to read multiple IP camera streams (rtsp) and run different Machine Learning Algorithms over it in real time. For each camera stream,

  


  

  1. I spawn an ffmpeg process which continuously break the rtsp streams
into frames and store them as images (JPEG). The streams use H.264
encoding. I am taking 1 frame every second as output.

  


  2. Message queues corresponding to models are given the message
containing location of the file.

  


  3. Models keep on picking up the file and drawing inferences

  


  


  The problem I am facing is the CPU usage by ffmpeg decoding process. For real time inference without any loss of frames, I have to beef up my server by a core for every 2 camera streams. Is there any optimization I am missing for ffmpeg ?

  


  I am using Intel Xeon Gold processor with Ubuntu 18.04 OS

  


• How to effectly record and encode from udp stream(4K HECV) in real time with ffmpeg ?

  25 janvier 2021, par Sa Mei

  I have a serious problem about ffmpeg to solve.
My task is to record from udp stream(4K HECV) and encode it to a mxf file.
My CPU is Intel(R) Xeon(R) Gold 5122 CPU@3.60GHz
The situation of CPU when it is recording from udp stream

  


  The situation of the udp stream

  


  The ffmpeg I used from https://github.com/BtbN/FFmpeg-Builds/commit/86af523883173be93c69d1170d1f78f79dc5e9f8 .
The command I used is :
ffmpeg -y -threads 6 -i "udp ://@225.1.2.150:6150 ?overrun_nonfatal=1&fifo_size=50000000" -threads 32 -qscale:v 2 -alternate_scan 1 -f mxf "G :\4k.xmf"

  


  Now the speed is lower than 1.0x after running for a while(about 10minutes). Maybe this is due to the temperature of the cpu gradually increasing.
The picture above displays the performance of CPU when we specify threads=6 for decoding and threads=32 for encoding.
I found that the speed would be 1.0x if I just recorded it to a .hecv file. But now I want to encode the stream to a .mxf file in real time. But as you can see, if I tried to encode it in real time, the speed of decoding and encoding would always be lower than 1.0x (around 0.98x). After running this command for about 3 hours, the recording and encoding process will be stopped.

  


  How to solve it ? I expect that the speed is 1.0x by speeding up encoding or other ways.
Or anyone knows that how to record the udp stream without re-encoding to a .hecv file and meanwhile encode the .hecv file to a .mxf file ?