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• avcodec/mpeg12dec : Don't adapt (last|next)_pic.linesize for field pics

  23 juin 2024, par Andreas Rheinhardt

  avcodec/mpeg12dec : Don't adapt (last|next)_pic.linesize for field pics
  These values are not read anywhere. Furthermore, since commit
  
  fe6037fd04db8837dcdb9013f9c4ad4e7eb0592e the linesize values
  
  of the MPVWorkPictures were wrong for subsequent fields
  
  in a chain of B-pictures (as they are always doubled and no longer
  
  based upon the frame-linesizes) which can eventually lead to overflow.
  Finally, it makes no real sense to ever double the linesize
  
  of the reference pictures at all : Even when the current picture
  
  is a field, it can still reference both fields of reference
  
  pictures and therefore the linesize should allow to address
  
  both fields (for the same reason, data is not offset for
  
  reference pictures).
  libavcodec/mpeg12dec.c:1304:41 : runtime error : signed integer overflow : 4611686018427387904 * 2 cannot be represented in type 'long'
  issue : 69732/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEGVIDEO_fuzzer-5123551179374592
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg12dec.c

• Merge pull request #390 from hjfuji/feature/ja

  4 avril 2013, par jackmoore

  Merge pull request #390 from hjfuji/feature/ja
  Japanese translation
  

• How to make HLS start from the begining

  15 septembre 2020, par Ariel Argañaraz

  I need some help with HLS streaming, I'm trying to create a playlist for streaming,

  



  I'm using ffmpeg to generate the files and the .m3u8 files. And for playing i'm using a web page with videojs player

  



  The idea is to simulate a live streaming using files already created.

  



  The problem is that in some version of iphone works and in another does not work.
The problem is that when I start play the video in the Safari browser of my phone it freezes for a while and then download and play the last segment.

  



  for example if the video is split in 4 differents .ts files.
It starts playing from the 4th .ts file and then stop.

  



  The problem is that I have 2 iphone mobile phone, one of them works perfectly but the other one not

  



  The not working cell phone is a iphone 6 (version 9.2.1)

  



  Here is my m3u8 file. Note that I'm using the #EXT-X-PLAYLIST-TYPE:EVENT and I remove the #EXT-X-ENDLIST from the botton. So it should be played as an live streaming.

  



  It works for another phones, it begins from the 0 second when I set the #EXT-X-START:TIME-OFFSET=0

  



  but in this version (9.2.1) the video freezes and then jumps to the last segment (webinar-3.ts) plays that segment and finally stop.

  



  #EXTM3U
#EXT-X-VERSION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:NO
#EXT-X-PLAYLIST-TYPE:EVENT
#EXT-X-START:TIME-OFFSET=0
#EXT-X-TARGETDURATION:6
#EXTINF:5.046444,
webinar-0.ts
#EXTINF:5,
webinar-1.ts
#EXTINF:5,
webinar-2.ts
#EXTINF:5,
webinar-3.ts


  



  Have anybody got an idea of what i'm doing wrong or how to get a m3u8 config that works for this iphone version ?