Recherche avancée

Sur d’autres sites (5092)

• Create MPEG-DASH Initialization segment

  5 janvier 2016, par Mahout

  I am looking to convert between HLS and MPEG Dash. I do not access to the original fully concatenated video file, only the individual HLS segments.

  In doing this transformation to MPEG Dash I need to supply an initialziation segment for the Dash manifest .mpd file.

  My questions are :

  1. What is the structure of a Dash video initialization segment ?
  2. How can I generate/create one without the need for the original full file ?

  Perhaps a solution would involve getting MP4Box to convert the ’.ts’ HLS segments to Dash ’.m4s’ segments which are self initializing, but I am unsure how to go about this this ?

  Any ideas are much appreciated.

  Many thanks.

  UPDATE :
  Snippet to stream using original hls segments. Video plays all the way through but is just black.

    <representation width="426" height="238" framerate="25" bandwidth="400000">
  
      <segmentlist timescale="25000" duration="112500">
  
             <segmenturl media="video_0_400000/hls/segment_0.ts"></segmenturl>
  
             <segmenturl media="video_0_400000/hls/segment_1.ts"></segmenturl>
  
            <segmenturl media="video_0_400000/hls/segment_2.ts"></segmenturl>
  
      </segmentlist>
  
     </representation>

• avcodec/g729dec : Use 64bit and clip in scalar product

  5 novembre 2019, par Michael Niedermayer

  avcodec/g729dec : Use 64bit and clip in scalar product
  The G729 reference decoder clips after each individual operation and keeps track if overflow
  
  occurred (in the fixed point implementation), this here is
  
  simpler and faster but not 1:1 the same what the reference does.
  Non fuzzed samples which trigger any such overflow are welcome, so
  
  the need and impact of different clipping solutions can be evaluated.
  Fixes : signed integer overflow : 1271483721 + 1073676289 cannot be represented in type 'int'
  
  Fixes : 18617/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ACELP_KELVIN_fuzzer-5137705679978496
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/g729dec.c

• checkasm : Add a "run-checkasm" make target

  14 février 2024, par Martin Storsjö

  checkasm : Add a "run-checkasm" make target
  Contrary to the existing "fate-checkasm", this always prints the
  
  tool output, and runs all tests at once instead of splitting it up
  
  per target group. This is more useful when the user expects to
  
  look directly at the tool output, instead of being part of a full
  
  fate run.
  (On failure with the regular "make fate-checkasm" targets, none of
  
  the tool output is printed, but stored in files. If run with reporting
  
  set up to the FATE website, the individual failures are uploaded there,
  
  but if it is run in some sort of other CI setup, the intermediate files
  
  might not be available afterwards for inspection.)
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] tests/checkasm/Makefile