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• Convert SDR-JPEG to HDR-AVIF [closed]

  27 avril 2024, par Jonas Janzen

  I would like to convert a jpg file into an avif file that is to be saved in HDR10-capable metadata (PQ curve, 2020 color space, 10 bit).

  


  The idea is to save normal SDR images in HDR-capable containers so that they can be displayed in all their glory on HDR-capable displays.

  


  I want to play with inverse tone mapping, to manipulate the output, so I implemented in Python via subprocess.

  


  So far I just want the input image to be saved in AVIF as HDR and look the same at the end as before, so that I can then make changes in the next step.

  


  I used the following command for this :

  


  ffmpeg_command = [
'ffmpeg',

  


  Input File
'-i', temp_file,

  


  Used Library
'-c', 'libaom-av1',

  


  '-still-picture', '1',

  


  Output Metadata
'-pix_fmt', 'yuv420p10le',
'-strict', 'experimental',
'-color_primaries', 'bt2020',
'-color_trc', 'smpte2084',
'-colorspace', 'bt2020nc',
'-color_range', 'pc',

  


  Output File
output_file
]

  


  So far my attempts have only been successful with the HLG characteristic. Here you can see that the images are really brighter in the peaks on my HDR monitor.

  


  With the PQ characteristic curve, the images are far too oversaturated.

  


  I guess this is because the HLG curve is compatible with the gamma curve, but PQ is not.

  


  Now my question is what I need to change.

  


  Which curve does FFMpeg expect as input.

  


  In Python I can change the images mathematically without any problems.

  


  The Example Images are again tone mapped down to jpg, to show what happened.

  


  enter image description here
enter image description here

  


• youtube-dl (ffmpeg) blank error on embedding subtitles

  22 mars 2021, par Human1

  I am new to using youtube-dl, and therefore is quite unfamiliar with how it works. I configured it to download auto subs and english subs (if there were any), and embed them in the video. It worked for me for quite a good while (1 or 2 months), and it suddenly stopped working with blank errors starting to pop up, and I have no idea why that happened. I have checked that I am using the most updated version of youtube-dl and ffmpeg. I am currently using a m1 mac , and I don't know if that caused the problem. Below is the output I got with the -v command, as well as some background information.

  


  [debug] System config: []
[debug] User config: ['-o', '~/Documents/playlists/%(playlist)s/%(playlist_index)-i%(title)s.%(ext)s', '-f', 'mp4', '--write-sub', '--sub-lang', 'en', '--write-auto-sub', '--embed-subs']
[debug] Custom config: []
[debug] Command-line args: ['https://youtube.com/playlist?list=PL4cUxeGkcC9i3FXJSUfmsNOx8E7u6UuhG', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.03.14
[debug] Git HEAD: 59ada80ca
[debug] Python version 3.9.2 (CPython) - macOS-11.2.3-arm64-arm-64bit
[debug] exe versions: ffmpeg present, ffprobe present, rtmpdump 2.4
[debug] Proxy map: {}
[youtube:tab] PL4cUxeGkcC9i3FXJSUfmsNOx8E7u6UuhG: Downloading webpage
[download] Downloading playlist: CSS Flexbox Tutorial
[youtube:tab] playlist CSS Flexbox Tutorial: Downloading 12 videos
[download] Downloading video 1 of 12
[youtube] Y8zMYaD1bz0: Downloading webpage
[info] Writing video subtitles to: /Users/{username}/Documents/playlists/CSS Flexbox Tutorial/1CSS Flexbox Tutorial #1 - Introduction.en.vtt
[debug] Invoking downloader on 'https://r2---sn-45gpjx-3x4e.googlevideo.com/videoplayback?expire=1616392628&ei=VN1XYKikA9eo1gai6KegBg&ip=45.133.192.196&id=o-APtlxrUI2wU4tPFiSxBi5MzLnuR5EFYL3-TE-BpiPEYG&itag=22&source=youtube&requiressl=yes&mh=U3&mm=31%2C29&mn=sn-45gpjx-3x4e%2Csn-5hne6nlr&ms=au%2Crdu&mv=m&mvi=2&pl=24&initcwndbps=1155000&vprv=1&mime=video%2Fmp4&ns=r0wuXA2lBVMGhop9uJeEHHUF&ratebypass=yes&dur=317.161&lmt=1607169749865434&mt=1616370759&fvip=3&fexp=24001373%2C24007246&c=WEB&txp=5432434&n=_jK4PI5-7sa9Q0X2ye&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cratebypass%2Cdur%2Clmt&sig=AOq0QJ8wRAIgR0wbVc18mWDheT_QVT5Jsbmd647wKJNyVfzGRJd_oOkCIArV-vvKQmD3D7W90dw1l9b3zaJQNzltitp3BJPt2fqA&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhAI9I7LQw5zTAldgCydhe3yzicBgvxYfxeHxI8lCxh3sLAiEAlT8Dpf93fiPbdMI3rHOebH-nFkToCZr1VfWaoX0HVeg%3D'
[download] /Users/{username}/Documents/playlists/CSS Flexbox Tutorial/1CSS Flexbox Tutorial #1 - Introduction.mp4 has already been downloaded
[download] 100% of 16.50MiB
[ffmpeg] Embedding subtitles in '/Users/{username}/Documents/playlists/CSS Flexbox Tutorial/1CSS Flexbox Tutorial #1 - Introduction.mp4'
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:/Users/{username}/Documents/playlists/CSS Flexbox Tutorial/1CSS Flexbox Tutorial #1 - Introduction.mp4' -i 'file:/Users/{username}/Documents/playlists/CSS Flexbox Tutorial/1CSS Flexbox Tutorial #1 - Introduction.en.vtt' -map 0 -c copy -map -0:s -map -0:d -c:s mov_text -map 1:0 -metadata:s:s:0 language=eng 'file:/Users/{username}/Documents/playlists/CSS Flexbox Tutorial/1CSS Flexbox Tutorial #1 - Introduction.temp.mp4'
ERROR: 
Traceback (most recent call last):
  File "/opt/homebrew/Cellar/youtube-dl/2021.3.14/libexec/lib/python3.9/site-packages/youtube_dl/YoutubeDL.py", line 2106, in post_process
    files_to_delete, info = pp.run(info)
  File "/opt/homebrew/Cellar/youtube-dl/2021.3.14/libexec/lib/python3.9/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 426, in run
    self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
  File "/opt/homebrew/Cellar/youtube-dl/2021.3.14/libexec/lib/python3.9/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 235, in run_ffmpeg_multiple_files
    raise FFmpegPostProcessorError(msg)
youtube_dl.postprocessor.ffmpeg.FFmpegPostProcessorError


  


  I would be very grateful if anyone can tell me what happened and what should I do next. Thanks ! ;)

  


• C# File.Move creates an empty file and IO exception

  30 novembre 2020, par Maddie

  My code processes a video file (using ffmpeg) and creates different qualities (360p, 480p, etc) and formats (mp4 and HLS) of that. After creating these files, I move all of them to another drive (a network location).

  


  my code looks Like this :

  


  var files = Directory.GetFiles(srcFolder);
string filename, destFile = string.Empty, srcFile = string.Empty;
try
{
    for (int i = 0; i < files.Length; i++)
    {
        srcFile = files[i];
        filename = Path.GetFileName(srcFile);
        destFile = Path.Combine(destFolder, filename);
        File.Move(srcFile, destFile);
    }
}
catch
{
    _logger.LogError("Error in moving file. srcFile: {0}, destFile: {1}", destFile, srcFile);
    throw;
}


  


  This process works fine most of the time, but for some files, I get an IO exception every time I run this process.

  


  


  System.IO.IOException : The file exists. at System.IO.FileSystem.MoveFile(String sourceFullPath, String destFullPath, Boolean overwrite)

  


  


  I made sure that destFolder does not exist before, nor did the destFile.

  


  After logging the error and finding the path of source and target files, I downloaded both of them. The source file is a .ts file with a size of 1,048 KB, and the target file is an empty file with the same name (0KB).

  


  This error happened multiple times with the same video, so I assume that it has something to do with the file itself. But I cannot figure it out.