Recherche avancée

Sur d’autres sites (10110)

• avfilter/vf_curves : add PCHIP interpolator and interp option

  2 octobre 2022, par Takeshi (Kesh) Ikuma

  avfilter/vf_curves : add PCHIP interpolator and interp option
  summary : This patch modifies the `curves` filter with new `interp` option
  
           to let user pick the existing natural cubic spline interpolation
  
           and the new PCHIP interapolation.
  reason :  The natural cubic spline does not impose monotonicity between
  
           the keypoints. As such, the fitted curve may vary wildly against
  
           user's intension. The PCHIP interpolation is not as smooth as
  
           the natural spline but guarantees the monotonicity. Providing
  
           both options enhances users experience (e.g., reduces the number
  
           of keypoints to realize the desired curve). See the related bug
  
           report for the example of an ill-interpolated curve.
  alternate solution :
  
           Both Photoshop and GIMP appear to use monotonic interpolation in
  
           their curve tools, which were the models for this filter. As
  
           such, an alternate solution is to drop the natural spline and
  
           go without the `interp` option.
  related bug report : https://trac.ffmpeg.org/ticket/9947 (filed by myself)
  Signed-off-by : Takeshi (Kesh) Ikuma <tikuma@hotmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_curves.c

• Why can't I get a manually modified MPEG-4 extended box (chunk) size to work ?

  15 avril 2019, par Moshe Rubin

  Overview

  As part of a project to write an MPEG-4 (MP4) file parser, I need to understand how an extended box (or chunk) size is processed within an MP4 file. When I tried to manually simulate an MP4 file with an extended box size, media players report that the file is invalid.

  Technical Information

  Paraphrasing the MPEG-4 specification :

  An MP4 file is formed as a series of objects called ’boxes’. All data is contained in boxes, there is no other data within the file.

  Here is a screen capture of Section 4.2 : Object Structure, which describes the box header and its size and type fields :

  

  

  Most MP4 box headers contain two fields : a 32-bit compact box size and a 32-bit box type. The compact box size supports a box’s data up to 4 GB. Occasionally an MP4 box may have more data than that (e.g., a large video file). In this case, the compact box size is set to 1, and eight (8) octets are added immediately following the box type. This 64-bit number is known as the ’extended box size’, and supports a box’s size up to 2^64.

  To understand the extended box size better, I took a simple MP4 file and wanted to modify the moov/trak/mdia box to use the extended box size, rather than the compact size.

  Here is what the MP4 file looks like before modifying it. The three box headers are highlighted in RED :

  

  My plan was as follows :

  1. Modify the moov/trak/mdia box
     • In the moov/trak/mdia, insert eight (8) octets immediately following the box type (’mdia’). This will eventually be our extended box size.
     • Copy the compact box size to the newly-inserted extended box size, adding 8 to the size to compensate for the newly inserted octets. The size is inserted in big-endian order.
     • Set the compact size to 1.
  2. Modify the moov/trak box
     • Add 8 to the existing compact box size (to compensate for the eight octets added to mdia).
  3. Modify the moov box
     • Add 8 to the existing compact box size (again, to compensate for the eight octets in mdia)

  Here’s what the MP4 file looks like now, with the modified octets are in RED :

  

  What have we done ?

  We have told the MP4 parser/player to take the moov/trak/mdia box size from the extended field rather than the compact size field, and have increased all parent boxes by eight (8) to compensate for the newly-inserted extended box size in the mdia box.

  What’s the problem ?

  When I attempt to play the modified MP4 file I receive error messages from different media players :

  

  

  Why do the media players see the modified file as invalid MP4 ?

  • Did I need to alter any other fields ?
  • Does the extended box size have to be greater than 2^32 ?
  • Can it be that only specific box types support extended box size (e.g., Media Data) ?

• avformat/hls : Add ec3 to allowed_extensions

  6 avril, par Michael Niedermayer

  avformat/hls : Add ec3 to allowed_extensions
  Fixes part of Ticket11435
  
  Fixes : Elisa Viihde (Finnish online recording service)
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hls.c