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• Error while creating thumb from video ubuntu ffmpeg

  1er janvier 2019, par dev21

  using below line to generate thumb from the video saved in the public folder in the laravel 4.2 application.

  exec("ffmpeg -ss 00:00:05 -i /var/www/html/project/public/".$directory."".$filename." -vf 'select=not(mod(n\,1000)),scale=320:240' /var/www/html/project/public/".$d.$thumb." >> log_file.log 2>&1 &",$output, $exit_code);

  but "log_file.log" contains the following line :

  cannot create user data directory: /var/www/snap/ffmpeg/411: Read-only file system

  I used snap to install the ffmpeg.

• Subtitles are always stuck in first line using ffmpeg fluent, same command works perfectly on cmd

  7 novembre 2024, par mattg07

  im making a tool that generates assets, 3 image, 3 audios and 3 srt subtitles files.
Then doing a for loop to generate 3 separate videos putting those assets together.
the video is working fine when it comes to image and audio, but the subtitles are stuck on the first line.
I have tried outputOptions(vf -subtitlesFile), videoFilters(vf -subtitlesFile) input(subFile).
And nothing works, In each scenario the srt is stuck in first line like so.

  


  When i do it on command like -i b-roll-2.png -i voiceover-2.mp3 -vf "subtitles=voiceover-2.srt" -c:v libx264 -c:a copy -shortest output22.mp4. It works perfectly.

  


  The files are dynamic, but ffmpeg is reaching all of then.

  


  1
00:00:00,000 —> 00:00:03,900
To influence people, make one key change in how you talk,

  


  (Stuck here)
2
00:00:03,900 —> 00:00:06,580
says communication expert Matt Abrahams.

  


  this is my code, im using node.js

  


    for (let i = 0; i < images.length; i++) {
    const inputImage = path.join(dir, images[i]);
    const inputAudio = path.join(dir, audio[i]);
    const inputSub = path.join(dir, sub[i]).replace(/\\/g, "/");
    const outputVideo = path.join(dir, `output_${i}.mp4`);

    if (!fs.existsSync(inputImage)) {
      console.error(`Image file not found: ${inputImage}`);
      continue;
    }
    if (!fs.existsSync(inputAudio)) {
      console.error(`Audio file not found: ${inputAudio}`);
      continue;
    }
    if (!fs.existsSync(inputSub)) {
      console.error(`Sub file not found: ${inputSub}`);
      continue;
    }

    await new Promise((resolve, reject) => {
      ffmpeg()
        .input(inputImage)
        .input(inputAudio)
        .videoCodec("libx264") // Set video codec
        .audioCodec("copy") // Copy the audio without re-encoding
        .outputOptions([
          "-preset veryfast",
          "-pix_fmt yuv444p",
          `vf subtitles=${inputSub}`
        ])
        .on("stderr", (stderr) => {
          console.error("FFmpeg STDERR:", stderr); // Logs FFmpeg's standard error output
        })
        .on("stdout", (stdout) => {
          console.log("FFmpeg STDOUT:", stdout); // Logs FFmpeg's standard output
        })
        .on("end", resolve)
        .on("error", (err, stdout, stderr) => {
          console.error("Error: " + err.message);
          console.error("ffmpeg stdout: " + stdout);
          console.error("ffmpeg stderr: " + stderr);
          reject(err);
        })
        .save(outputVideo);
    });
    console.log("ready processing");
  }


  


  Tried everything but nothing works using fluent. Only cmd

  


• swscale/aarch64 : add hscale specializations

  26 mai 2022, par Swinney, Jonathan

  swscale/aarch64 : add hscale specializations
  This patch adds code to support specializations of the hscale function
  
  and adds a specialization for filterSize == 4.
  ff_hscale8to15_4_neon is a complete rewrite. Since the main bottleneck
  
  here is loading the data from src, this data is loaded a whole block
  
  ahead and stored back to the stack to be loaded again with ld4. This
  
  arranges the data for most efficient use of the vector instructions and
  
  removes the need for completion adds at the end. The number of
  
  iterations of the C per iteration of the assembly is increased from 4 to
  
  8, but because of the prefetching, there must be a special section
  
  without prefetching when dstW < 16.
  This improves speed on Graviton 2 (Neoverse N1) dramatically in the case
  
  where previously fs=8 would have been required.
  before : hscale_8_to_15__fs_8_dstW_512_neon : 1962.8
  
  after : hscale_8_to_15__fs_4_dstW_512_neon : 1220.9
  Signed-off-by : Jonathan Swinney <jswinney@amazon.com>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libswscale/aarch64/hscale.S
  • [DH] libswscale/aarch64/swscale.c
  • [DH] libswscale/utils.c