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• Revision 86912 : Le plug est fait pour spip 3.0 et 3.1 donc ajout d’une borne mini ...

  29 décembre 2014, par spip.franck@… — Log

  Le plug est fait pour spip 3.0 et 3.1 donc ajout d’une borne mini manquante concernant l’utilise "polyhier" (la 2.0.1 est la première version dispo pour spip 3.0.0)

• Generating fragmented mp4 ffmpeg is causing the video to have a duration of 0ms in bento4

  23 octobre 2020, par noboss

  Im using ffmpeg to generate a fragmented mp4 with the following command :

  


  ffmpeg -re -i ./input.mp4 -g 52 \
-strict experimental -acodec aac -ab 64k -vcodec libx264 -vb 448k \
-f mp4 -movflags frag_keyframe+empty_moov \
./output.mp4


  


  When I'm playing it in an HTMLMediaElement the video.duration = Infinity.
When I inspect the file with mp4info from bento4 I get :

  


  File:
  major brand:      isom
  minor version:    200
  compatible brand: isom
  compatible brand: iso2
  compatible brand: avc1
  compatible brand: mp41
  fast start:       yes

Movie:
  duration:   612961 ms
  time scale: 1000
  fragments:  no

Found 2 Tracks
Track 1:
  flags:        3 ENABLED IN-MOVIE
  id:           1
  type:         Video
  duration: 0 ms
  language: und
  media:
    sample count: 15322
    timescale:    12800
    duration:     7844864 (media timescale units)
    duration:     612880 (ms)
    bitrate (computed): 2587.007 Kbps
[...]
Track 2:
  flags:        3 ENABLED IN-MOVIE
  id:           2
  type:         Audio
  duration: 0 ms
  language: eng
  media:
    sample count: 26398
    timescale:    44100
    duration:     27031552 (media timescale units)
    duration:     612960 (ms)
    bitrate (computed): 128.584 Kbps
[...]


  


  Has someone any idea what I'm doing wrong ?

  


• Playback drops frames or stutter on good hardware [closed]

  30 décembre 2023, par Lemonek

  I'm planning to use TDARR and tring to prevent any issues before with (re)encoding. And I have stumbled on issue with one TV Show - recently I have downloaded refreshed old show but playback stutters on TV or drops frames (few frames every few secs - so video plays nicely but suddenly few frames are dropeed and then for next few secs it playsnicely - no issues with sound)

  


  I guess this particular video has some options which causes issues or I dont know but here are some facts I have gathered (ffprobe -v quiet -print_format json -show_format -show_streams) :

  


  

  1. The TV is capable of playing FullHD HECV 10bit smoothly https://pastebin.com/0efSGjk9

  


  2. Original video stutters https://pastebin.com/vvLn8y4a

  


  3. Converted video (QSV) stutters (linux/ffmpeg https://pastebin.com/XbazLEft
Below cutout part of script parameters for converting - $FPS is supplied as without it ffmpeg does not create I Frames but that is not a problem here)

  


  


          -hide_banner -y -init_hw_device qsv:hw \
        -hwaccel qsv -hwaccel_output_format qsv \
        -i "$FILENAME_BACK" \
        -map 0:v:0 -map 0:a:0 \
        -c:v hevc_qsv -preset slow -global_quality 22 -g $FPS\
        -c:a copy \
        -movflags faststart "$FILENAME_OUTPUT"


  


  

  4. Converted video (NVENC) plays nicely (win/handbrake) https://pastebin.com/HbBNMZvT

  


  


  In the end I wish I could create "safe" parameters list which I will supply to TDARR and not to worry about issues while converting videos.

  


  Forgot to mention - Hardware on which Im planning to mass encode has Intel proc with QSV capabilities - I'm not planning to encode on NV.

  


  If needed - I can provide any other information.