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• Bad connection emulation for video stream

  9 février 2023, par sergii.gudym

  what is the easiest way to check friezes and lags for different internet speeds of a video file ? Maybe some players can run local videos with problem emulation ?

  


• ffmpeg : remove misleading and incorrect warning messages

  15 juin 2017, par wm4

  ffmpeg : remove misleading and incorrect warning messages
  It is wrong/incorrect in two aspects :
  
  1. The pixel format is not enough to guarantee that the resulting file
  
     will be any more compatible with media players.
  
  2. Media players not supporting higher profiles are not necessarily
  
     outdated (in fact this is simply an arrogant statement that
  
     libavcodec can handle these particular features).
  You could add that there are plenty of other ways to produce widely
  
  incompatible files with ffmpeg, and these don't show any warnings.
  What we really want to do here is defaulting to codec profiles that
  
  have wide compatibility, such as main/high for h264. Also, if an
  
  encoder does not accept certain pixfmts, we should automatically
  
  convert them to a pixfmt the encoder can accept. But the existing
  
  message certainly is not appropriate.
  It also works for 2 specific encoders only. Extending it for other
  
  cases would result in a lot of special cases, so this is not the
  
  right place.
  

  • [DH] ffmpeg.c

• Full HD video converted to FLV, slow playback in browser

  12 février 2012, par Boyan Georgiev

  I rendered a full HD video using Adobe AfterEffects CS5 in mp4 format. It plays just fine. I've got this video app to which I fed the mp4 file. The video app converts the mp4 to flv format and makes the video available via a web page. I've downloaded the resulting flv file to my local PC - it plays just fine in my VLC player. But, the problem is I'm getting awful playback inside my browser.

  I've made sure the issue is not bandwidth related.
  Both original mp4 file, and ffmpeg-converted FLV file, play perfectly using VLC player.
  I've tested the FLV file with two players - Agryia FLV Player Elite and JW Player. Both players play the video awfully - really slow and very choppy.

  Here's my ffmpeg -i myflvfile.flv :
  `

  Seems stream 0 codec frame rate differs from container frame rate: 119.88 (120000/1001) -> 59.92 (719/12)
  
  Input #0, flv, from '94044631305552037.flv':
  
  Metadata:
  
  duration        : 146
  
  width           : 1920
  
  height          : 1080
  
  videodatarate   : 684
  
  framerate       : 60
  
  videocodecid    : 7
  
  audiodatarate   : 62
  
  audiosamplerate : 22050
  
  audiosamplesize : 16
  
  stereo          : true
  
  audiocodecid    : 2
  
  major_brand     : mp42
  
  minor_version   : 0
  
  compatible_brands: mp42mp41
  
  creation_time   : 2012-02-10 00:55:19
  
  encoder         : Lavf52.111.0
  
  filesize        : 61969316
  
  Duration: 00:02:25.77, start: 0.034000, bitrate: 764 kb/s
  
  Stream #0.0: Video: h264 (High), yuv420p, 1920x1080 [PAR 3:4 DAR 4:3], 700 kb/s, 59.92 tbr, 1k tbn, 119.88 tbc
  
  Stream #0.1: Audio: mp3, 22050 Hz, stereo, s16, 64 kb/s`

  Can any one point me in the right direction here ? Why is playback perfect with VLC player of both the mp4 and the flv file on my local PC, yet in my browser, using two different players, the playback is so bad ?

  PS Here's my convert command :

  ffmpeg -y -i /var/www/sandverlag.com/htdocs/rmtk/videos/originals/94044631305552038.mp4 -vcodec libx264 -ar 22050 -ac 2 -vb 700000 -s 1920x1080 -crf 22 -threads 0 -f flv /var/www/sandverlag.com/htdocs/rmtk/videos/converted/94044631305552038.flv > /dev/null &