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• avcodec/mjpegdec : Use correct number of codes for VLC tables

  8 octobre 2020, par Andreas Rheinhardt

  avcodec/mjpegdec : Use correct number of codes for VLC tables
  Commit 1249698e1b424cff8e77e6a83cfdbc9d11e01aa7 made
  
  ff_mjpeg_decode_dht() call build_vlc() with a wrong (too hight)
  
  number of codes. The reason it worked is that the lengths of the extraneous
  
  entries is initialized to zero and ff_init_vlc_sparse() ignores codes
  
  with a length of zero. But using a too high number of codes was
  
  nevertheless bad, because a) the assert in build_vlc() could have been
  
  triggered (namely if the real amount of codes is 256) and b) the loop in
  
  build_vlc() uses initialized data (leading to Valgrind errors [1]).
  
  Furthermore, the old code spend CPU cycles in said loop although the
  
  result won't be used anyway.
  [1] : http://fate.ffmpeg.org/report.cgi?slot=x86_64-archlinux-gcc-valgrind&time=20201008025137
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/mjpegdec.c

• FFMPEG restream m3u8 to Youtube keeps returning "Failed to update header with correct duration & filesize" after 1st segment

  12 septembre 2020, par user3263433

  I'm trying to retream a m3u8 live feed toYouTube but I keep running into errors.

  


  When watching the feed in a webplayer it works fine.

  


  The headers of the m3u8 file are as follow :

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:8
#EXT-X-MEDIA-SEQUENCE:127629
#EXT-X-DISCONTINUITY-SEQUENCE:0
#EXT-X-PROGRAM-DATE-TIME:2020-09-12T12:57:13.280Z


  


  Here is the ffmpeg log :

  


  frame=  226 fps= 25 q=29.0 size=    1303kB time=00:00:07.04 bitrate=1516.2kbits/frame=  238 fps= 

    25 q=23.0 size=    1414kB time=00:00:07.52 bitrate=1540.5kbits/[https @ 0x56067993d3c0] Opening 'fileurl.ts' for reading
    frame=  250 fps= 25 q=19.0 size=    1536kB time=00:00:08.00 bitrate=1572.8kbits/frame=  251 fps= 24 q=17.0 size=    1536kB time=00:00:08.04 bitrate=1565.3kbits/[flv @ 0x560679c4be40] 
Failed to update header with correct duration.
    [flv @ 0x560679c4be40] Failed to update header with correct filesize.
    frame=  251 fps= 22 q=-1.0 Lsize=    1851kB time=00:00:09.92 bitrate=1528.0kbits/s dup=0 drop=499 speed=0.859x


  


  It seems like it loads 1 .ts file fine but fails after that.

  


  I'm currently using :

  


  ffmpeg -re -i (urlToM3U8) -codec copy -f flv rtmp://a.rtmp.youtube.com/live2/(streamkey)


  


• What is the correct command line format for ffmpeg in this case

  11 septembre 2020, par Adam Fenton

  I apologise if this is a duplicate. I have used ffmpeg in the past to convert .pngs to .mp4 but now I am using it on my own files and I am not sure of the format it should have.
I have some files with the following naming convention :

  


     ./profiles_0.png
   ./profiles_40.png
   ...
   ./profiles_400.png


  


  The number of files I have varies, i.e. it isn't always 400 and the interval isn't always going to be 40. I have tried the following :

  


  ffmpeg -framerate 1 -i profiles_%d0.png -r 6 -pix_fmt yuv420p out.mp4


  


  but that only captures one of the images. Is there a flexible format in the 'profiles_%d0.png" argument that captures all of the files in that directory regardless of the number of characters following the underscore or does it require that I change my naming convention ?

  


  Cheers for any help,
A