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• Can't Transfer .DAT (mpeg2 codec) Video to Any Other Format [closed]

  14 mai 2021, par Juan Jinping

  I have a PS2 official bonus DVD which is full of 3 hour cutscenes of MGS3. But I don't have my PS2 anymore to watch it. So I decided to transfer lossless or at least the most lossless possible. Because I am some kind of obsessed.

  


  I tried to use FFMPEG but it doesn't look it worked. At least once a minute the video goes blocky, pixelated. I tried the codes given below. I could find way more better videos on YouTube.

  


  Neither of these and their variations worked :
ffmpeg -i DEMO_3.dat DEMO_3.mkv
ffmpeg -i DEMO_3.dat -c:v libx264 -crf 0 DEMO_3.mkv

  


  I also tried it to use 3000k bitrate because it's the original bitrate of this video ffmpeg -i DEMO_3.dat -c:v libx264 -b 3000k DEMO_3.mkv

  


  Then I thought I could convert them into .png frames then reencode h264 to with "-crf 0". But frames that I extracted were blocky and pixelated too. ffmpeg -i DEMO_3.dat -r 29.970/1 %06d.png

  


  I wanted to check if my disc is broken or damaged. I downloaded the disc that I own as .iso on the internet and tried the same things but got the same results.

  


  And also the audio is not even extracted eventhough Mediainfo says there is 4 audio tracks. (probably besides English any other 3 dubs and I want them too)

  


  Long story short I want the .dat file with highest quality possible video and all audio tracks in the original mpeg2 codec or h264 codec in mkv container. You can recommend me any other program to do it or just give me code advices.

  


• How to fix the problem of wrong colors shown in the local video window of MicroSIP ?

  25 juillet 2022, par Yadid

  I'm developing a project which is a customization based on MicroSIP in Windows. The local video window performs the video stream from Screen Capture Recorder, which is as a virtual camera and captures the screen. And the problem is the colors of the picture of the local video window are not correct. The picture I uploaded is the example of the problem, it seems like that the red and the blue are exchanged.

  
I'd tried to upgrade the FFmpeg to 5.0.1 and the SDL to 2.0.22, both are probably the latest versions, but it doesn't fix the color problem.

  
This problem also occurs when using the latest official version of MicroSIP(3.21.2).
  
source code of MicroSIP
  
source code of PJSIP (the low-level module which provides interfaces for video, audio, etc. Maybe it's the origin of the color problem)
  
And while using some of the other software which can display pictures of the virtual camera, they can show pictures fine with the correct colors, e.g. MyCam.

  
How to fix this problem ? Or which parts can I do some research on about this problem ? Any help would be appreciated.

  


• lavc/sbrdsp : R-V V autocorrelate

  8 novembre 2023, par Rémi Denis-Courmont

  lavc/sbrdsp : R-V V autocorrelate
  With 5 accumulator vectors and 6 inputs, this can only use LMUL=2.
  
  Also the number of vector loop iterations is small, just 5 on 128-bit
  
  vector hardware.
  The vector loop is somewhat unusual in that it processes data in
  
  descending memory order, in order to save on vector slides :
  
  in descending order, we can extract elements to carry over to the next
  
  iteration from the bottom of the vectors directly. With ascending order
  
  (see in the Opus postfilter function), there are no ways to get the top
  
  elements directly. On the downside, this requires the use of separate
  
  shift and sub (the would-be SH3SUB instruction does not exist), with
  
  a small pipeline stall on the vector load address.
  The edge cases in scalar are done in scalar as this saves on loads
  
  and remains significantly faster than C.
  autocorrelate_c : 669.2
  
  autocorrelate_rvv_f32 : 421.0
  

  • [DH] libavcodec/riscv/sbrdsp_init.c
  • [DH] libavcodec/riscv/sbrdsp_rvv.S