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• ffmpeg-mp4box-mpeg dash plays only few segments

  30 octobre 2015, par Idris

  Need help in debugging the segment dash files

  The input was an MP4 with these details. This was recorded from a video camera, the output from the camera was mkv and we converted into MP4 after editing the audio via adobe

  • Size: 7.51 GB Frame rate: 25 frames/ second
  • Data rate: 25326kbps
  • Total bitrate: 25525kbps

  Converted this to another mp4 with this command

  ffmpeg -i "input.mp4" -s 1280x720 -c:v libx264 -b:v 750k -bf 2 -g 75 -sc_threshold 0 -an video_1280x720_750k.mp4
  
  ffmpeg -i "input.mp4"  -c:a aac -strict experimental -b:a 96k -ar 32000 -vn audio_96k.mp4
  

  The output video has

  • fps: 25
  • Data rate: 761kbps
  • bitrate: 761kbps

  Then, created the segmented dash through MP4Box

  MP4Box -dash 10000 -frag 10000 -rap -segment-name video_0_1280000\segment_ video_1280x720_750k.mp4
  
  MP4Box -dash 3000 -frag 10000 -rap -segment-name audio_0_96000\segment_ audio_96k.mp4
  

  The MPD generated was validated online and its perfect

  UPDATE! Included the MPD file

  <?xml version="1.0"?>
  
  
   
    
   
  
   
     
       
         
         
           
           
           
           
           
           
           
           
           
           
           
           
           
           
         
       
     
    
     
      
       
       
       
       
       
       
       
       
       
       
       
       
       
       
      
     
    
  
   
  
  

  Played the video through dashjs.. I believe it just plays the initial segment and errors out as MEDIA_ERR_DECODE..MEDIA_ERR_SRC_NOT_SUPPORTED.. or some message which says start not found..

  Through chrome debugging I see that atleast 4 segments are correctly loading.. I am not sure whats going on..

  Any help in debugging the issue is really appreciated. I really can't understand if this is a problem with the file or ffmpeg or mp4box or chrome.

  Output from chrome debugging tool

  [dash.js 1.5.1] new MediaPlayer instance has been created 
  dash.all.js:11 Playback initiated! 
  dash.all.js:11 Parsing complete: ( xml2json: 5ms, objectiron: 10ms, total: 0.015s) 
  dash.all.js:11 Manifest has been refreshed at Mon Oct 26 2015 10:19:22 GMT-0400 (Eastern Daylight Time)[1445869162092]  
  dash.all.js:11 SegmentTimeline detected using calculated Live Edge Time 
  dash.all.js:11 MediaSource is open! 
  dash.all.js:11 [object Event] 
  dash.all.js:11 Duration successfully set to: 120 
  dash.all.js:11 Added 0 inline events 
  dash.all.js:11 video codec: video/mp4;codecs="avc3.64001f" 
  dash.all.js:11 [video] stop 
  dash.all.js:11 audio codec: audio/mp4;codecs="mp4a.40.2" 
  dash.all.js:11 [audio] stop 
  dash.all.js:11 No text data. 
  dash.all.js:11 No fragmentedText data. 
  dash.all.js:11 No muxed data. 
  dash.all.js:11 [video] start 
  dash.all.js:11 [video] Getting the request for time: 0 
  dash.all.js:11 [video] Index for time 0 is 0 
  dash.all.js:11 [video] SegmentList: 0 / 120 
  dash.all.js:11 [audio] start 
  dash.all.js:11 [audio] Getting the request for time: 0 
  dash.all.js:11 [audio] Index for time 0 is 0 
  dash.all.js:11 [audio] SegmentList: 0 / 120 
  dash.all.js:11 [video] Getting the request for time: 9.83328125 
  dash.all.js:11 [video] Index for time 9.83328125 is 0 
  dash.all.js:11 [video] SegmentList: 0 / 120 
  dash.all.js:11 [video] SegmentList: 9.83328125 / 120 
  dash.all.js:11 [audio] Getting the request for time: 9.99996875 
  dash.all.js:11 [audio] Index for time 9.99996875 is 0 
  dash.all.js:11 [audio] SegmentList: 0 / 120 
  dash.all.js:11 [audio] SegmentList: 9.99996875 / 120 
  dash.all.js:11 loaded audio:Media Segment:0 (200, 20ms, 6ms) 
  dash.all.js:11 loaded video:Media Segment:0 (200, 153ms, 43ms) 
  dash.all.js:11 loaded video:Initialization Segment:NaN (200, 0ms, 32ms) 
  dash.all.js:11 [video] Initialization finished loading 
  dash.all.js:11 loaded audio:Initialization Segment:NaN (200, 0ms, 34ms) 
  dash.all.js:11 [audio] Initialization finished loading 
  dash.all.js:11 [video] Getting the request for time: 19.6665625 
  dash.all.js:11 [video] Index for time 19.6665625 is 1 
  dash.all.js:11 [video] SegmentList: 9.83328125 / 120 
  dash.all.js:11 [video] SegmentList: 19.6665625 / 120 
  dash.all.js:11 [audio] Getting the request for time: 19.9999375 
  dash.all.js:11 [audio] Index for time 19.9999375 is 1 
  dash.all.js:11 [audio] SegmentList: 9.99996875 / 120 
  dash.all.js:11 [audio] SegmentList: 19.9999375 / 120 
  dash.all.js:11 [video] Stalling Buffer 
  dash.all.js:11 [video] Waiting for more buffer before starting playback. 
  dash.all.js:11 [video] Getting the request for time: 0 
  dash.all.js:11 [video] Index for time 0 is 0 
  dash.all.js:11 [audio] Stalling Buffer 
  dash.all.js:11 [audio] Waiting for more buffer before starting playback. 
  dash.all.js:11 [audio] Getting the request for time: 0 
  dash.all.js:11 [audio] Index for time 0 is 0 
  dash.all.js:11 

• Is there any good documentation of **x264** internals ?

  18 octobre 2015, par firoozg

  I want a to study about x264 internals?

  Is there any good resource about the algorithms and code structure?

  Or at least a resource to study about the intra prediction algorithms used in x264.

• x264 intra prediction mode for 4x4 luma blocks

  14 octobre 2015, par firoozg

  what is the exact algorithm x264 uses for:

  intra prediction mode selection for 4x4 luma blocks in I-fames

  which parts of libx264 code are related to the above algorithm?

• Batch Encode video with command line using x264, neroAacEnc& mkvmerge [closed]

  10 octobre 2015, par Key

  I have 200+ videos in a folder, which i need to encode with a profile setting i have in MeGUI. I tried this profile setting using this command line and it works fine for only video.

  "D:\Encoders\Megui\tools\x264\x264.exe" --preset veryslow --tune animation --crf 22.0 --deblock 2:1 --min-keyint 1 --bframes 8 --qpmin 10 --qpmax 51 --aq-mode 2 --nr 500 --non-deterministic --output "Output-01.mkv" "Input-01.mkv"
  

  Well, it only encodes video and one file at a time.

  Is there batch script to run in a folder for x264 to encode videos, neroAacEnc audios and mkvmerge join the files together. I have ffmpeg installed but i'm not sure if this profile setting will work with ffmpeg.

  If it's not possible with a single batch file. Then alternatively i'm thinking x264 to encode all videos in a new output folder. neroAacEnc to encode audios in that same output folder and then another command for mkvmerge to join videos and audios.

• What does ' wpredp' parameter do in x264 (or FFmpeg) ?

  9 octobre 2015, par Alexandr

  I don't understand what 'wpredp' do? I've tried to find the description of 'wpredp' parameter but without success. Can somebody explain what it do?