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• avformat/mux : Avoid overhead of packet list in case of single streams

  9 octobre 2021, par Andreas Rheinhardt

  avformat/mux : Avoid overhead of packet list in case of single streams
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/internal.h
  • [DH] libavformat/mux.c

• How to merge segmented webvtt subtitle files and output a single file ?

  15 février, par Dobbelina

  How to merge a segmented webvtt subtitle file and output a single file ?,
m3u8 looks like this example :

  



  #EXTM3U
#EXT-X-VERSION:4
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:4
#USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-1.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-2.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-3.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-4.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-5.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-6.webvtt
#EXT-X-ENDLIST


  



  I noticed that each segment is not synchronized/cued against total playing time, but against the individual ts segments.
If ffmpeg could be used to do this, what magic input do i need to give it ?

  



  A single correctly cued vtt or srt file is what i want.

  



  I have a great appetite and don't like chunks, lol !

  



  Thanks for any replies you lovely people !

  



  ---

  



  With this i get a merged vtt file, but the cues are all wrong :

  



  ffmpeg -i "https://cmoreseusphlsvod60.akamaized.net/vod/bea44/0ghzi1b2cz5(11792107_ISMUSP).ism/0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000.m3u8" -f segment -segment_time 4 -segment_format webvtt -scodec copy out-%05d.vtt


  



  Each segment is not synchronized/cued against total playing time, but against the individual ts segments.
Example output of above command :

  



  WEBVTT

00:00.000 --> 00:03.040
Du har aktier i ett företag
som saknar framtid.

00:00.000 --> 00:03.280
De vill ha aktierna.
Du känner dem inte, Olga.

00:00.000 --> 00:01.720
De som får Kastrups aktier vinner.


  



  Cues all start like this which isn't very helpfull : 00:00.000

  



  Some segments contains no cues, like segment 15 for example :
https://cmoreseusphlsvod60.akamaized.net/vod/bea44/0ghzi1b2cz5(11792107_ISMUSP).ism/0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-15.webvtt

  



  


  "A WebVTT Segment MAY contain no cues ; this indicates that no
 subtitles are to be displayed during that period."

  


  


• hwcontext_vulkan : add support for allocating all planes in a single allocation

  7 décembre 2021, par Wenbin Chen

  hwcontext_vulkan : add support for allocating all planes in a single allocation
  VAAPI on Intel can import external frame, but the planes of the external
  
  frames should be in the same drm object. A new option "contiguous_planes"
  
  is added to device. This flag tells device to allocate places in one
  
  memory. When device is derived from vaapi this flag will be enabled.
  
  A new flag frame_flag is also added to AVVulkanFramesContext. User
  
  can use this flag to force enable or disable this behaviour.
  
  A new variable "offset "is added to AVVKFrame. It describe describe the
  
  offset from the memory currently bound to the VkImage.
  Signed-off-by : Wenbin Chen <wenbin.chen@intel.com>
  
  Further-modifications-by : Lynne <dev@lynne.ee>
  

  • [DH] libavutil/hwcontext_vulkan.c
  • [DH] libavutil/hwcontext_vulkan.h