Recherche avancée

Sur d’autres sites (4561)

• compiling FFmpeg on AIX

  3 mars 2017, par epitaxial

  I’m a hardware guy that likes to play around with different architectures and operating systems. Anyhow I’m trying to compile FFmpeg on AIX 7.1 using gcc but having some issues. I grabbed the latest code from git and while it does compile with a few warnings FFmpeg does not work. From my limited understanding it looks like the code is using 64 bit integers but was compiled as 32 bit ? Maybe someone can shed some light on this. Here is what happens when executing FFmpeg

  ./ffmpeg -i rtsp://192.168.1.9:554 -an -c copy -t 1:00:00 test.mp4
  
  ffmpeg version 3.2.git Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8.5 (GCC)
  
  configuration: --enable-nonfree
  
  libavutil      55. 47.100 / 55. 47.100
  
  libavcodec     57. 81.100 / 57. 81.100
  
  libavformat    57. 66.102 / 57. 66.102
  
  libavdevice    57.  2.100 / 57.  2.100
  
  libavfilter     6. 74.100 /  6. 74.100
  
  libswscale      4.  3.101 /  4.  3.101
  
  libswresample   2.  4.100 /  2.  4.100
  
  [NULL @ 20932ac0] Value 0.000000 for parameter 'avioflags' is not a valid    set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 2097664.000000 for parameter 'fflags' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 0.000000 for parameter 'fdebug' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 1.000000 for parameter 'f_err_detect' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 1.000000 for parameter 'err_detect' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtpflags' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtsp_transport' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtsp_flags' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 15.000000 for parameter 'allowed_media_types' is not a valid set of 32bit integer flags
  
  [rtsp @ 20932ac0] Unable to open RTSP for listening
  
  rtsp://192.168.1.9:554: Can't assign requested address

  Is my reasoning correct ? Thanks.

• Camera Rendering Buffers and Stutters When Processing Large Video Files with FFmpeg

  20 avril 2023, par TIANYU HU

  When rendering a real-time camera, I use ffmpeg to process a large video file(like 4G or even larger) at the same time. However, I noticed that the video frames are buffering and stuttering, indicated they are probably competing for limited system resources, like cpu, memory or I/O bandwidth etc.

  


  I‘ve tried a lot of experiments to figure out the root cause. Firstly I limit the cpu usage of ffmpeg to 25%, but sadly it’s not getting better.

  


  Then I suspect that ffmpeg would read the large video file from disk to page cache in memory as much as it can before processing, and the generated files are going to be written back from page cache to disk. The RAM of our computer is 8G, apparently it needs to swap in and swap out pages between memory and disk. This process is costly for the CPU, and other processes are likely to trigger an interrupt named “Page Fault” when they access pages that are not actually loaded into memory. If the time taken for “page fault” is too long, the program may lag.

  


  Lastly I configure the system parameters related to “write back dirty pages to disk”, such as vm.dirty_writeback_centisecs and vm.dirty_background_ratio, to try to write back the dirty (Disk I/O) more frequently or infrequently. But I’m not quite sure what would happen if I modify these parameters.

  


  Expection :
The requirement can be summarized as “real-time video rendering has higher priority, and the low rate of large file processing is accepted”, are there any possible solutions of this issue from your perspective ? Thanks in advance.

  


• Android Java (ffmpeg-kit). Assistance(opinion) with combining 4 ffmpeg commands together

  26 novembre 2022, par D-MAN

  I have the following 4 ffmpeg commands. 1. adds a png frame(border) over the entire length of the video. 2. creates a boomerang effect. 3. adds an outro jpeg to the last 2 seconds of the video. 4. Adds an intro jpeg to the first 2 seconds of the video.(these commands work individually)

  


  My aim is to combine all of these individual commands into one command to create a complete edited video. The final video needs all these elements in one final edited video.

  


  Your assistance is greatly appreciated.

  


  /**
 *

 * (Middle overlay filter) String exe = "-i " + input_video_uri + " -framerate 60 -i " + frame + " -filter_complex [0]pad="+mVideoWidth+":"+mVideoHeight+":576:0[vid];[vid][1]overlay -c:a copy -vcodec mpeg4 -crf 0 -preset ultrafast -qscale 0 " + file2.getAbsolutePath();

 * (Boomerang effect) String exe = "-y -i " + input_video_uri + " -filter_complex [0]reverse[r];[0][r][0]concat=n=3,setpts=0.5*PTS " + file2.getAbsolutePath();

 * (Put image at end of video) String exe = "-i "+ input_video_uri +" -i "+ frame +" -filter_complex \"[0:v][1:v] overlay=0:0:enable='between(t,"+ (msec - 2 ) + ","+ msec+")'\" -pix_fmt yuv420p -c:a copy " + file2.getAbsolutePath();

 * (Put image at start of video) String exe = "-i "+ input_video_uri +" -i "+ frame +" -filter_complex \"[0:v][1:v] overlay=0:0:enable='between(t,0,2)'\" -pix_fmt yuv420p -c:a copy " + file2.getAbsolutePath();

 * */


  


  Being new to ffmpeg, I am limited in knowledge. However, I have tried '&&' which produced an unrecognized error from the ffmpeg library.