Recherche avancée

Sur d’autres sites (11588)

• h264pred : added AVX2 implementation for tm_vp8 16x16.

  18 mars 2017, par Mirage Abeysekara

  h264pred : added AVX2 implementation for tm_vp8 16x16.
  checkasm —bench results with 5000 runs
  pred16x16_tm_vp8_c : 302.8
  
  pred16x16_tm_vp8_mmx : 101.4
  
  pred16x16_tm_vp8_mmxext : 95.5
  
  pred16x16_tm_vp8_sse2 : 95.1
  
  pred16x16_tm_vp8_avx2 : 38.2
  Signed-off-by : Ronald S. Bultje <rsbultje@gmail.com>
  

  • [DH] libavcodec/x86/h264_intrapred.asm
  • [DH] libavcodec/x86/h264_intrapred_init.c

• timelapse images into a movie, 500 at a time

  2 mars 2017, par molly78

  I am trying to make a script to turn a bunch of timelapse images into a movie, using ffmpeg.

  The latest problem is how to loop thru the images in, say, batches of 500.

  There could be 100 images from the day, or there could be 5000 images.

  The reason for breaking this apart is due to running out of memory.

  Afterwards I would need to cat them using MP4Box to join all together...

  I am entirely new to bash, but not entirely programming.

  What I think needs to happen is this

  1) read in the folders contents as the images may not be consecutively named

  2) send ffmpeg a list of 500 at a time to process (https://trac.ffmpeg.org/wiki/Concatenate)

  2b) while you’re looping thru this, set a counter to determine how many loops you’ve done

  3) use the number of loops to create the MP4Box cat command line to join them all at the end.

  the basic script that works if there’s only say 500 images is :

  #!/bin/bash
  
  
  
  dy=$(date '+%Y-%m-%d')
  
  
  
  ffmpeg -framerate 24 -s hd1080 -pattern_type glob -i "/mnt/cams/Camera1/$dy/*.jpg" -vcodec libx264 -pix_fmt yuv420p Cam1-"$dy".mp4

  MP4Box’s cat command looks like :

  MP4Box -cat Cam1-$dy7.mp4 -cat Cam1-$dy6.mp4 -cat Cam1-$dy5.mp4 -cat Cam1-$dy4.mp4 -cat Cam1-$dy3.mp4 -cat Cam1-$dy2.mp4 -cat Cam1-$dy1.mp4 "Cam1 - $dy1 to $dy7.mp4"

  Needless to say help is immensely appreciated for my project

• ffmpeg - Have troubling syncing up audio and video together

  15 février 2017, par zyeek

  I have a webcam and a separate mic. I want to record what is happening.

  It almost works, however the audio seems to play quickly and parts missing while playing over the video.

  This is the command I am currently using to get it partially working

  ffmpeg -thread_queue_size 1024 -f alsa -ac 1 -i plughw:1,0 -f video4linux2 -thread_queue_size 1024 -re -s 1280x720 -i /dev/video0 -r 25 -f avi -q:a 2 -acodec libmp3lame -ab 96k out.mp4

  I have tried other arguments, but unsure if it has to do with the formats I am using or incorrect parameter settings.

  Also, the next part would be how to stream it. Everytime I try going through rtp it complains about multiple streams. I tried doing html as well, but didn’t like the format. html html://localhost:50000/live_feed or rts rts://localhost:5000

  edit :

  I am running this on a rpi 3.