Recherche avancée

Sur d’autres sites (7482)

• how can i rotate text on video only without the video with ffmpeg commands

  13 juillet 2023, par Abdullah Mohamed

  I want to rotate the text only on the video
here is my code

  


  -i '/Users/me-mac/Library/Developer/CoreSimulator/Devices/F4189FE6-50EA-40B4-AE0F-F19074EE1488/data/Containers/Data/Application/7C214A2B-440B-468F-85F4-AE74CC4EC509/tmp/.video/1687332725.289482_IMG_0136.MOV' -filter_complex 'crop=1181.25:2100.0:1089.375:0.0,            drawtext=
              text=Abdullah Muhammad
              :fontsize=30
              :x=300
              :y=600
              :box=1
              :boxborderw=20
              :boxcolor=Gold
              ' -preset ultrafast -y '/Users/me-mac/Library/Developer/CoreSimulator/Devices/F4189FE6-50EA-40B4-AE0F-F19074EE1488/data/Containers/Data/Application/7C214A2B-440B-468F-85F4-AE74CC4EC509/Library/Caches/1687332725.289482_IMG_0136_1689171861232.mp4'


  


  what i have tried

  


  -i '/Users/me-mac/Library/Developer/CoreSimulator/Devices/F4189FE6-50EA-40B4-AE0F-F19074EE1488/data/Containers/Data/Application/7C214A2B-440B-468F-85F4-AE74CC4EC509/tmp/.video/1687332725.289482_IMG_0136.MOV' -filter_complex 'crop=1181.25:2100.0:1089.375:0.0,            drawtext=
              text=Abdullah Muhammad
              :fontsize=30
              :x=300
              :y=600
              :box=1
              :boxborderw=20
        :boxcolor=Gold
        ,rotate=PI/6
              ' -preset ultrafast -y '/Users/me-mac/Library/Developer/CoreSimulator/Devices/F4189FE6-50EA-40B4-AE0F-F19074EE1488/data/Containers/Data/Application/7C214A2B-440B-468F-85F4-AE74CC4EC509/Library/Caches/1687332725.289482_IMG_0136_1689171861232.mp4'


  


  expected result

  


  


  Text only to be rotated

  


  


  actual result

  


  


  Text and video are rotated

  


  


• 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 ?

  


• 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