Recherche avancée

Sur d’autres sites (6890)

• Parsing showinfo output when extracting frames from FFMPEG

  19 novembre 2019, par Lee Goodman

  I am attempting to extract frames with their timestamps from videos using the command line but I am struggling to relate both the output of the showinfo filter to the actual frames outputted by the command, as well as the corresponding output file names from the -frame_pts option. I am extracting 1 frame per second using the following command :

  ffmpeg -y -i GOPR3427.MP4 -r 1 -vf showinfo -copyts -s 640x480 -frame_pts 1 GOPR3427.MP4-frames/%d.jpg > GOPR3427.MP4-frames/output.txt  2>&1 -hide_banner

  this output a series of jpg’s from 0 -11, for example, 0.jpg, 1.jpg, 2.jpg etc. According to FFPROBE, my video has a duration of 10.581333

  My understanding from this superuser answer here is that the -frame_pts sets the numeral portion of the output image filename to represent the timestamp based on the frame rate. So in my example, the frame rate is 50/1 and according to the logic in the answer, I should be able to calculate the pts_time as follows 3.jpg would be : 3/50 = 0.06

  If I check in the output.txt file I can see a line that reads

  [Parsed_showinfo_0 @ 0x563d384a5080] n:   3 pts:   5400 pts_time:0.06    pos:   451041 fmt:yuvj420p sar:1/1 s:1920x1080 i:P iskey:0 type:P checksum:D56E24BB plane_checksum:[A1E26C9D C6294D84 DB726A8B] mean:[131 145 104 ] stdev:[27.4 23.2 20.8 ]

  This corresponds with the calculation above, however my output.txt contains 528 parsed line entries like the one above, yet my command outputs only 11 files, using the logic above the file named 11.jpg would be a pts_time of 0.22 , this doesn’t represent 1 x frame every second.

  Can anyone help tie this together for me, at the moment I am struggling to understand the outputs here.

• Museum of Multimedia Software, Part 4

  20 août 2010, par Multimedia Mike — Software Museum

  This is the last part of the series, at least until some more multimedia software shows up at my favorite thrift shop or the other boneyards I scavenge.

  Miscellaneous Multimedia Programs
  This set includes the titles Matinee FMV Screensaver, MetaCreations Painter Classic, and Multimedia JumpStart. The second one is likely a creation program. I have no idea what the third one is, while the first title gives me chills just thinking about the implications.

  
  
  

  Miscellaneous Creativity Software
  Magic Theatre and Microsoft Home : Creative Writer. I think I loaded up the former once to find a very basic animation program. The latter isn’t necessarily multimedia-related but certainly classifies as creative software. It also reminds me of the ad I once spied in Entertainment Weekly magazine during the mid-1990s for a Microsoft music history CD-ROM. MS branched out into all kinds of niches.

  
  
  

  More Multimedia Creativity Software
  VideoCraft and U-Create Games & Animation. I wager these would be fun to play around with if I had the time.

  
  
  

  Showcase CD-ROMs
  "What Can You Make ? Showcase 7" from Macromedia and Microsoft Multimedia Pack 10.

  
  
  

  Basic Multimedia Software Discs
  As a multimedia nerd, these Apple QuickTime and Microsoft Video for Windows discs make me sentimental.

  
  
  

  Real Software Collection
  Grit your teeth and gaze upon CD-ROM distributions of Real’s software. There is a RealAudio disc back from when Real still called themselves Progressive Networks. "Everything you need to hear the web roar !"

  
  
  

  Clips
  And a few multimedia clip CD-ROMs, along with a disc that promises to test and tune your MPC setup.

  
  
  

  Wrap-Up
  I would be remiss if I neglected to mention a few more pieces of multimedia creation software in my collection. First, there’s the Barbie Storymaker. I actually gave that one a go, as you can tragically see from that link. Further, the Taco Bell fast food restaurant chain ran, as one of their many kids meal promotions, a series of 4 simple Comics Constructor CD-ROMs. I played briefly with it here and again during an exploration of XML data formats and the parsing thereof (which the software uses).

• FFMPEG fast quality video encoding without quality loss & less storage occupancy (maybe using GPU)

  27 mars 2024, par Diwash Mainali

  I Have written a go code but it is slow and the video compression rate is also not that impressive. I am new to FFMPEG and my entire project depends on FFMPEG. I have tried different video codecs like vp9, h264, h265, NVENC, AV1, etc. All of them were too slow (maybe I am not good enough to optimize it). My project is based on Go and the current codec that I am using is libx264. Can anyone help me optimize the video encoding part of my project.

  


  Libx264 :

  


  func encodeVideo(fileName, bitrate, crf, preset, resolution string) *exec.Cmd {
    return exec.Command("C:\\ffmpeg-6.1-full_build\\bin\\ffmpeg",
        "-i", "./userUploadDatas/videos/"+fileName,
        "-c:v", "libx264",
        "-b:v", bitrate,
        "-crf", crf,
        "-preset", preset,
        "-vf", "scale="+resolution,
        "./userUploadDatas/videos/"+fileName+"_encoded"+".mp4")
}


  


  Please provide static value of each parameters. Any codec will work for me as long as it is fast, occupies less space & doesn't loose spaces.

  


  The problems I have faces with different codecs are :

  


  

  1. NVENC : Fast but the size of video is doubled & loss of video quality.

  


  2. libx264 : Best I can find currently, but is slow.

  


  3. h264, h265 : Occupies more space

  


  4. Av1 & vp9 : Was too slow and wasn't able to encode 30sec video in 1hrs.

  


  


  The specs of hardware that I am using is Ryzen7 5000 series CPU, NVIDIA RTX 3050 Ti Laptop GPU.