Recherche avancée

Sur d’autres sites (6412)

• avformat/udp : increase the default buffer size of a receiving socket to 384K

  14 janvier 2020, par Marton Balint

  avformat/udp : increase the default buffer size of a receiving socket to 384K
  It is a common mistake that people only increase fifo_size when they experience
  
  drops, unfortunately this does not help for higher bitrate (> 100 Mbps) streams
  
  when the reader thread simply might not receive the packets in time (especially
  
  under high CPU load) if the default 64 KB of kernel buffer size is used.
  New default is determined so that common linux systems can set this buffer size
  
  without tuning kernel parameters.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/protocols.texi
  • [DH] libavformat/udp.c

• FFMPEG conversion from .H264 to MP4 playing too fast

  28 juin 2017, par NickR

  I accidentally deleted a video file but managed to save it with a recovery tool. The video was however corrupted, but I managed to repair that and now have a .h264 file.

  The file plays ok in the VLC player. There are a few glitches but on the whole its 98% perfect. However I now need to convert that into a more useable format (mp4 say).

  Ive downloaded the FFMPEG tool and have managed to pretty easily copy into mp4 with the following command line instruction :

  ffmpeg -i repairedVid.h264 -c copy repairedVid.mp4

  The problem is that the video is playing much too fast. I’ve done some research tried some tweaks that seem to have worked for other people (like forcing frame rate and changing the -vsync) :

  ffmpeg -i repairedVid.h264 -c copy repairedVid.mp4 -vsync 2 -r 23.976

  Ive also tried the crude approach of slowing the video down like this, but this was more of a long shot and I don’t think is the right way to go about it

  ffmpeg -i repairedVid.mp4 -filter:v "setpts=1.5*PTS" repairedVid.mp4

  This is the output when the video copies to MP4. Looks like it might have a clue to the problem (the video should be much longer than 4:40 minutes) :

  frame=13459 fps=1118 q=-1.0 size= 4102773kB time=00:04:40.65 bitrate=119756.4kbiframe=13459 fps=1117 q=-1.0 Lsize= 4102928kB time=00:04:40.65 bitrate=119761.0kbits/s speed=23.3x
  video:4102773kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.003784%

  I’m totally new to FFMPEG and not having much luck. Any advice would be great.

  Thanks in advance

• 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).