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• avformat/hlsenc : remove the first slash of the relative path line in the master m3u8...

  26 mars 2020, par Limin Wang

  avformat/hlsenc : remove the first slash of the relative path line in the master m3u8 file
  Please testing with the following command :
  
  ./ffmpeg -y -i input.mkv \
  
   -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
  
   -b:a:0 256k \
  
   -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0\
  
   -f hls -var_stream_map "v:0,a:0" \
  
   -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
  
   10 -master_pl_publish_rate 10  -hls_flags \
  
   delete_segments+discont_start+split_by_time ./tmp/video.m3u8
  then cat ./tmp/master.m3u8
  
  before :
  
  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33"
  
  /video.m3u8
  $ ./ffmpeg -i  ./tmp/master.m3u8 -c:v copy -c:a mp2 ./test.mkv
  
  [hls @ 0x7f82f9000000] Skip ('#EXT-X-VERSION:3')
  
  [hls @ 0x7f82f9000000] Opening '/video.m3u8' for reading
  
  [hls @ 0x7f82f9000000] parse_playlist error No such file or directory [/video.m3u8]
  
  ./tmp/master.m3u8 : No such file or directory
  after :
  
  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33"
  
  video.m3u8
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] libavformat/hlsenc.c

• error while compiling x264 in linux

  14 avril 2011, par kartul

  Hey all
  I'm trying to compile x264 under linux (x64). But it keeps throwing me an error. I've googled around but found nothing. Here's the commandline history :

  spin@around : /x264$ git clone git ://git.videolan.org/x264.git
  Cloning into x264...
  remote : Counting objects : 13539, done.
  remote : Compressing objects : 100% (4416/4416), done.
  remote : Total 13539 (delta 11005), reused 11225 (delta 9082)
  Receiving objects : 100% (13539/13539), 3.29 MiB | 2.79 MiB/s, done.
  Resolving deltas : 100% (11005/11005), done.
  spin@around : /x264/x264$ ./configure
  Found no assembler
  Minimum version is yasm-0.7.0
  If you really want to compile without asm, configure with —disable-asm.
  spin@around : /x264/x264$ ./configure —disable-asm
  Platform :   X86_64
  System :     LINUX
  asm :        no
  avs :        no
  lavf :       no
  ffms :       no
  gpac :       no
  gpl :        yes
  thread :     posix
  filters :    crop select_every
  debug :      no
  gprof :      no
  PIC :        no
  shared :     no
  visualize :  no
  bit depth :  8
  You can run 'make' or 'make fprofiled' now.
  
  spin@around : /x264/x264$ make
  
  gcc -Wshadow -O3 -ffast-math  -Wall -I. -std=gnu99 -s -fomit-frame-pointer -fno-tree-vectorize   -c -o x264.o x264.c
  
  In file included from common/common.h:864,
  
                   from x264.c:33 :
  
  common/rectangle.h : In function āx264_macroblock_cache_rectā :
  
  common/rectangle.h:84 : error : āv4siā undeclared (first use in this function)
  
  common/rectangle.h:84 : error : (Each undeclared identifier is reported only once
  
  common/rectangle.h:84 : error : for each function it appears in.)
  
  common/rectangle.h:84 : error : expected ā ;ā before āv16ā
  
  common/rectangle.h:86 : error : ā__m128ā undeclared (first use in this function)
  
  common/rectangle.h:86 : error : expected ā ;ā before āv16ā
  
  common/rectangle.h:87 : error : expected ā ;ā before āv16ā
  
  common/rectangle.h:89 : error : expected ā ;ā before āv16ā
  
  common/rectangle.h:90 : error : expected ā ;ā before āv16ā
  
  make : *** [x264.o] Error 1
  
  spin@around : /x264/x264$
  

  and here is the file, from line 83 to 91 :

  #if HAVE_VECTOREXT && defined(__SSE__)
          v4si v16 = v,v,v,v ;
          M128( d+s*0+0 ) = (__m128)v16 ;
  
          M128( d+s*1+0 ) = (__m128)v16 ;
  
          if( h == 2 ) return ;
  
          M128( d+s*2+0 ) = (__m128)v16 ;
  
          M128( d+s*3+0 ) = (__m128)v16 ;
  
  #else
  

• How can I programmatically write and read random video watermarks ?

  13 novembre 2017, par GreenTriangle

  I spent a few minutes trying to think of a clearer way to word my title, but I couldn’t manage it, sorry.

  I want to essentially canary trap video files : I am (hypothetically, this is not real but a personal exercise) offering them up to 5,000 different people, and if one gets leaked, I want to know who leaked it. Metadata is too easily emoved, so what I’d like to do is add a random and subtle watermark to each file, and store information about that in a database.

  For example : on Joe Smith’s copy, a 10x10 pixel 80% transparent red square in the upper left corner for 5 frames. On Diane Brown’s copy, a full-width 5-pixel 90% transparent black bar on the bottom edge for 15 frames. Then, if I find a leaked copy, I could check it against the database.

  I know this still isn’t foolproof : cropping would break co-ordinates, hue/brightness transforms would break colour reading, cutting time would break timestamps. But if I did want to do this anyway, what would be a good strategy for it ?

  My idea was to generate PNG overlays randomly, split the video into parts with mkvtoolnix/ffmpeg, re-encode the middle part with ffmpeg + overlay filter, and then rejoin them. But is this silly when there’s a "proper" way to do it ? And what would I be doing to read the watermarks, which I can’t even really conceive of ?