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• checkasm/riscv : preserve T1 whilst calling...

  29 juillet 2024, par Rémi Denis-Courmont

  checkasm/riscv : preserve T1 whilst calling...
  This preserves T1 whilst calling the instrumented function. In a Sci-Fi
  
  setting where type-based Control Flow Integrity (CFI) is supported, the
  
  calling code (i.e., the `checkasm` test case) will set T1 to the expected
  
  value of the landing pad label (LPL) of the instrumented function.
  The call wrapper will always use LPL zero which is a wild card. We should
  
  preserve the value of T1 at least until the indirect call to the
  
  instrumented function. Of course this is Sci-Fi, because :
  
  1) there is no hardware (or even QEMU) support yet,
  
  2) all our assembler functions currently use LPL zero anyway.
  This uses T3 rather than T2 because indirect branches with T2 is reserved
  
  for notionally direct calls made with an indirect call instruction (e.g.
  
  due to GOT indirection), and are exempted from forward-edge CFI checks.
  

  • [DH] tests/checkasm/riscv/checkasm.S

• Converted mp4 from gif didn't shows in web browser

  16 décembre 2017, par Stojan Kukrika

  I am trying to convert animated GIFs to MP4 files using ffmpeg. Only this convert GIF to MP4 :

    exec('ffmpeg -i ' . $destinationPath . $filename . ' -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" ' . $destinationPath . $newFilename);

  And I can play it in my pc when download it from server, but it’s didn’t want to pay in browser. Browser returns me this error :
  

  After that GIF to MP4 converor I get one image for thumbnail image and that is works fine :

  exec("ffmpeg -i " . $destinationPath . $video . ".mp4 -ss  00:00:01.000 -vframes 1 ".storage_path().$folderNameThumb."/media.png");

  and it’s shows me a valid frame of GIF. Can anybody help me how to fix this problem with video ?

  ffprobe output
  
  ffprobe version 2.8.13 Copyright (c) 2007-2017 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16)
  
  configuration:
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101

  Here is what I get from one MP4 file (run ffprobe filename.mp4) :

   Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2mp41
  
  encoder         : Lavf56.40.101
  
  Duration: 00:00:02.16, start: 0.000000, bitrate: 593 kb/s
  
  Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 500x312 [SAR 1:1 DAR 125:78], 589 kb/s, 8.33 fps, 8.33 tbr, 12800 tbn, 25 tbc (default)
  
  Metadata:
  
  handler_name    : VideoHandler

  Because I use Laravel this is method for return media :

  public function getGifImage(Media $media)
  
  {
  
      $path = storage_path() . '/uploads/gif/' . $media->content;
  
      if (file_exists($path)) {
  
          return response()->download($path, null, [], null);
  
      }
  
  }

• How to upload 7MB GIF to Twitter's API

  22 février 2021, par randombits

  I have a bunch of JPEG frames that I use ImageMagick to stitch together into a GIF. The final product has the following type :

  


  GIF image data, version 89a, 1280 x 720

  


  This gives the effect of an animated GIF. My file sizes range anywhere between 6-8MB.

  


  If I upload this media manually to Twitter, it works great. Using TwitterOAuth PHP library found here when I attempt the following :

  


  $media = $twitterConnection->upload('media/upload', ['media' => 'my_file.gif');

  


  I get the following error :

  


  Image file size must be <= 5242880 bytes

  


  I have also tried uploading the file using Twitter's recommended Python large video library and that failed with the following :

  


  INIT
Media ID: 1362940800456351744
APPEND
4194304 of 7685061 bytes uploaded
APPEND
7685061 of 7685061 bytes uploaded
Upload chunks complete.
FINALIZE
{'media_id': 1362940800456351744, 'media_id_string': '1362940800456351744', 'media_key': '7_1362940800456351744', 'size': 7685061, 'expires_after_secs': 86400, 'processing_info': {'state': 'pending', 'check_after_secs': 1}}
Media processing status is pending
Checking after 1 seconds
STATUS
Media processing status is failed


  


  I am willing to use any platform/utility to get my video files uploaded to Twitter. What is my best bet to either :

  


  1 : Fix my file type to adhere to Twitter's requirements. Should it not be a GIF ? Should I be converting my still shot JPEG files to another format ?

  


  2 : Is there an API that Twitter has available that will allow the GIFs of these sizes to be uploaded ? Again, I can upload these files via the regular Twitter web UI client, but I cannot automate it via their API.

  


  How do I upload my GIF to Twitter using their API ?