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• vulkan_decode : remove informative queries

  24 décembre 2024, par Lynne

  vulkan_decode : remove informative queries
  We queried the decoder whether it was able to decode sucessfully, but
  
  since we operated asynchronously, we weren't able to do anything with
  
  this information but let the user know decoding failed for the previous
  
  frame(s).
  Since we parse the slice headers ourselves and we're reasonably sure we
  
  can decode before actually starting to decode, this was rarely triggered
  
  on corrupt data, and hardware's understanding of whether there was an error
  
  or not is vague.
  There's also a semantic problem with our use of the queries - if there's
  
  a seek, we flush, but what happens to the queries is vague according to
  
  the spec. Most hardware dealt fine, since queries are nothing more than
  
  GPU memory with integers stored. But with Intel, they seem to be more of
  
  a register to which a driver must keep track of, leading to issues if there's
  
  been a reset (seek) and we query the previous submission before the seek.
  Just get rid of them. The query code is still used in encoding.
  This fixes seeking with HEVC and AV1 on Intel.
  

  • [DH] libavcodec/vulkan_decode.c

• ffmpeg images to video with different start times and durations

  25 mai 2018, par Rich

  I’ve recently learned of FFMPEG’s existence and I am trying to use it on my wordpress site.

  On the site I am working on a html/php/js form page that lets users upload pictures, and set when the image shows and for how long.

  Right now the code I have is only showing one image for the entire video.

  <?php if (isset($_POST['button'])) { 
  
  echo shell_exec('ffmpeg -t '.$cap_1.' -i /myurl/beach-1866431.jpg -t '.$cap_2.' -i /myurl/orlando-1104481-1.jpg -filter_complex "scale=1280:-2" -i /myurl/audio.mp3 -c:v libx264 -pix_fmt yuv420p -t 30 -y /myurl/'.$v_title.'.mp4 2>&1');
  
   } ?>

  I tried setting "-t" for the duration with my php variables but nothing changes and I cant figure out what to use for the start time of each image.

  Also, when writing shell_exec commands, instead of it all being on one line, is there a way to write working command code in php files with line breaks ? For example -

   <?php if (isset($_POST['button'])) { 
  
      echo shell_exec('ffmpeg -t '.$cap_1.' -i /myurl/beach-1866431.jpg 
  
      -t '.$cap_2.' -i /myurl/orlando-1104481-1.jpg 
  
      -filter_complex "scale=1280:-2" 
  
      -i /myurl/audio.mp3 
  
      -c:v libx264 -pix_fmt yuv420p -t 30 -y /myurl/'.$v_title.'.mp4 2>&1');
  
           } ?>

  EDIT

  So far the concat text file seems to work, however I do not know how to set the start times for each image ---

  ffconcat version 1.0
  
  file /path/beach-1866431.jpg
  
  duration 3
  
  file /path/orlando-1104481-1.jpg
  
  duration 5
  
  file /path/beach-1866431.jpg

  And ffmpeg command -

  shell_exec('ffmpeg -f concat -safe 0 -i /path/file.txt -filter_complex "scale=1280:-2" -i /path/audio.mp3 -c:v libx264 -pix_fmt yuv420p -t 30 -y /path/'.$v_title.'.mp4 2>&1');

  EDIT 2

  Using the concat method suggested, my code now looks like this —

  <?php if (isset($_POST['button'])) { 
  
  echo shell_exec('ffmpeg \
  
  -loop 1 -framerate 24 -t 10 -i goldmetal.jpg \
  
  -i 3251.mp3 \
  
  -loop 1 -framerate 24 -t 10 -i cash-register-1885558.jpg \
  
  -loop 1 -framerate 24 -t 10 -i ice-1915849.jpg \
  
  -filter_complex "[0:v][1:a][2:v][3:v]concat=n=4:v=1:a=1[v][a]" -map "[v]" -map "[a]" -c:v libx264 /path/'.$v_title.'.mp4 2>&1');
  
   } ?>

  But I’m getting this error —

  **Stream specifier ':v' in filtergraph description [0:v][1:a][2:v][3:v]concat=n=4:v=1:a=1[v][a] matches no streams.**

  EDIT 3

  I almost got it working as needed, using 2 commands, one for the images and fade, the other to combine the audio. The only issue I’m having is changing the time each image shows up. —

  echo shell_exec('ffmpeg \
  
  -loop 1 -t 5 -i '.$thepath .'/'.$v_pix1.' \
  
  -loop 1 -t 5 -i ' .$thepath . '/cash-register-1885558.jpg \
  
  -loop 1 -t 5 -i ' .$thepath . '/ice-1915849.jpg \
  
  -loop 1 -t 5 -i '.$thepath .'/'.$v_pix1.' \
  
  -loop 1 -t 5 -i ' .$thepath . '/ice-1915849.jpg \
  
  -filter_complex \
  
  "[0:v]setpts=PTS-STARTPTS,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v0]; \
  
   [1:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v1]; \
  
   [2:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v2]; \
  
   [3:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v3]; \
  
   [4:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v4]; \
  
   [v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuv420p[v]" -map "[v]" -y '.$thepath .'/fadeout.mp4 2>&1');
  
  
  
  
  
  echo shell_exec('ffmpeg \
  
  -i '.$thepath .'/fadeout.mp4 \
  
  -i '.$thepath .'/3251.mp3 \
  
  -filter_complex "[0:v:0][1:a:0] concat=n=1:v=1:a=1 [vout] [aout]" -map "[vout]" -map "[aout]" -c:v libx264 -r 1 -y '.$thepath .'/mergetest.mp4 2>&1');

• x86inc : warn if XOP integer FMA instruction emulation is impossible

  1er août 2015, par Anton Mitrofanov

  x86inc : warn if XOP integer FMA instruction emulation is impossible
  Emulation requires a temporary register if arguments 1 and 4 are the same ; this
  
  doesn’t obey the semantics of the original instruction, so we can’t emulate
  
  that in x86inc.
  Also add pmacsdql emulation.
  Signed-off-by : Henrik Gramner <henrik@gramner.com>
  
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavutil/x86/x86inc.asm