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• 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 &    

• Revision 5b1dc1515f : Fix a bunch of TODO from vp9_short_idct32x32_add_neon. - full ASM version, no m

  26 septembre 2013, par Christian Duvivier

  Changed Paths :
   Delete /vp9/common/arm/neon/vp9_idct32x32_neon.c

  
   Modify /vp9/common/arm/neon/vp9_short_idct32x32_add_neon.asm

  
   Modify /vp9/vp9_common.mk

  
  
  Fix a bunch of TODO from vp9_short_idct32x32_add_neon.

   full ASM version, no more C gateway file.
   integrate combine-add with last step of 2nd pass.
   remove a few push/pop pairs.
   some instruction reordering to hide latency.

  Change-Id : Ic9d9933c908b65d1bf7ba8fd47b524cda808c9c6

• Adding a color filter at specific intervals in ffmpeg

  9 avril 2015, par JamieL

  I am looking to add the color filter to a rtmp stream in ffmpeg at specific time intervals, say for 10 seconds every 10 seconds. I have tried two approaches. The first :

  -vf "color=#8EABB8@0.9:480x208,select='gte(t,10)*lte(t,20)' [color];[in][color] overlay [out]"

  This streams only the 10 seconds indicated by the select and applies the color filter rather than playing the whole stream and applying the filter to just those 20 seconds.

  I then learnt about split and fifo and tried this approach :

  -vf "[in] split [no-color], fifo, [with-color] overlay [out]; [no-color] fifo, select='gte(t,10)*lte(t,20)' [with-color]"

  I would expect this to play the entire stream, and then select the 10 seconds specified so that I can apply filters, but it does the same as first approach and just plays the 10 seconds selected rather than the entire stream.

  Thanks in advance.