Recherche avancée

Sur d’autres sites (9712)

• How to create video and audio files for the Media Source Extension API ?

  5 décembre 2018, par Aman

  I have created a video player from the Media Source Extension API. I have split the video and audio from the original.mp4 (1 minute duration). I have split the video and audio into small 5 second files (12 files in total). I’m getting each one of them and playing them together. But the video stops playing at around 45-47 seconds. I cannot understand to why the video is stopping/buffering. I cannot understand whether the problem is in the javascript code or the video files ?

  I have uploaded all the resources here (https://drive.google.com/file/d/1NHc_yNRU0tvaU18aohLy74Js3y7UHD4N/view?usp=sharing). And written the commands I used to construct my video and audio files below. I have also noticed that this problem only occurs with Google Chrome and works perfectly and smoothly on Microsoft Edge. Thanks

  Making the Media files:

  Extracting video from original.mp4: MP4Box -single 1 original.mp4

  Extracting audio from original.mp4: MP4Box -single 2 original.mp4

  Splitting the video and audio into 5 second parts: ffmpeg -ss starting-time -to end-time -i (video.mp4 OR audio.mp4) (video_part.mp4 OR audio_part.mp4)

  Fragmenting all the video and audio parts: MP4Box -dash 1000 -rap -frag-rap(video_part.mp4 OR audio_part.mp4)

  Then using the fragmented video and audio files to be played via the Media Source Extension API video player. e.g. (video_part_dashinit.mp4 OR audio_part_dashinit.mp4)

• Anomalie #4227 (En cours) : Indication de l’extension d’une sauvegarde

  16 novembre 2018, par Franck D

  Hello :-)
  Un SPIP 3.3.0-dev [24147] tout neuf sans plug,
  Prefix des tables "test1" installation en MySQL
  En php 7.2 chez ovh
  Environement : stable
  Moteur : phpcgi
  Mode développement

  Quand je vais sur ecrire/ ?exec=restaurer, il y a le texte "Ou indiquez le nom du fichier à restaurer" !
  Je ne sais pas s’il s’agit d’une "anomalie", d’une évolution, ou d’un problème de texte et donc de "documentation" :-(
  Mais pour que cela fonctionne, il faut obligatoirement faire l’ajout en plus du nom ; de l’extension du fichier !

  Sans quoi, cela ne fonctionne pas, et c’est même perturbant, car le message d’erreur est "Ce nom de fichier n’est pas autorisé" !
  A voir s’il est possible de faire, une restauration en autre chose que sqlite, car dans si ce n’est pas le cas, il ne devrait servir à rien de devoir écrire l’extension

• How to convert a video and audio file to be smoothly played via Media Source Extension API ?

  4 octobre 2018, par Aman

  I have built a web video player using the Media Source Extension API. I have been testing my video player using local video and audio files on my PC. Everything works perfectly expect the video keeps buffering. I’m playing a 4k 60fps video, which I downloaded from YouTube. My PC is not 4k resolution, but the video smoothly plays through YouTube and VLC Media Player. I’m just surprised to why my Media Source Extension Video Player buffers even through the video and audio file are not being retrieved via network. I’m assuming that the video and audio files I’m using are causing this problem. So I will explain how I created my video and audio files first :

  1. I downloaded the video from https://www.youtube.com/watch?v=KaCQ8SQ6ZHQ&t=3s using the 4K Video Downloader https://www.4kdownload.com/products/product-videodownloader.

  2. Convert the mkv (the 4K Video Downloader only allows the 4k 60fps video to be downloaded in mkv format, for me) file to mp4 using ffmpeg in CMD : ffmpeg -i test.mkv -codec copy test.mp4.

  3. Converting the test.mp4 file to my preferred 4K resolution 3840x2160 from 3840x1632 using ffmpeg in CMD : ffmpeg -i test.mp4 -s 3840x2160 -c:a copy test_changed.mp4. (NOT SO IMPORTANT)

  4. Separating the video and audio of test_changed.mp4 to video.mp4 for video and audio.mp4 for audio using MP4Box in CMD : Video - MP4Box -single 1 test_changed.mp4 -out video.mp4 and Audio - MP4Box -single 2 test_changed.mp4 -out audio.mp4.

  5. Splitting both video.mp4 and audio.mp4 into 30 split parts each containing 5 seconds of the video and audio file. So I end up having (video_1.mp4,audio_1.mp4), (video_2.mp4,audio_2.mp4), (video_3.mp4,audio_3.mp4), ..... (video_29.mp4,audio_29.mp4), (video_30.mp4,audio_30.mp4). Using ffmpeg and one by one specifying the time range for each part in CMD :

     [For Part 1 : ffmpeg -ss 00:00:00 -to 00:00:05 -i video.mp4 video_1.mp4, ffmpeg -ss 00:00:00 -to 00:00:05 -i audio.mp4 audio_1.mp4],

     [For Part 2 : ffmpeg -ss 00:00:05 -to 00:00:10 -i video.mp4 video_2.mp4, ffmpeg -ss 00:00:05 -to 00:00:10 -i audio.mp4 audio_2.mp4],

     [For Part 3 : ffmpeg -ss 00:00:10 -to 00:00:15 -i video.mp4 video_3.mp4, ffmpeg -ss 00:00:10 -to 00:00:15 -i audio.mp4 audio_3.mp4],

     .....

     [For Part 29 : ffmpeg -ss 00:02:20 -to 00:02:25 -i video.mp4 video_29.mp4, ffmpeg -ss 00:02:20 -to 00:02:25 -i audio.mp4 audio_29.mp4],

     [For Part 30 : ffmpeg -ss 00:02:25 -to 00:02:30 -i video.mp4 video_30.mp4, ffmpeg -ss 00:02:25 -to 00:02:30 -i audio.mp4 audio_30.mp4].

  6. Fragmenting each of the video and audio parts using MP4Box in CMD(As far as I know, fragmented mp4 files are only files played via Media Source Extension API) :

     [For Part 1 : MP4Box -dash 1000 -rap -frag-rap video_1.mp4, MP4Box -dash 1000 -rap -frag-rap audio_1.mp4],

     [For Part 2 : MP4Box -dash 1000 -rap -frag-rap video_2.mp4, MP4Box -dash 1000 -rap -frag-rap audio_2.mp4],

     [For Part 3 : MP4Box -dash 1000 -rap -frag-rap video_3.mp4, MP4Box -dash 1000 -rap -frag-rap audio_3.mp4],

     .....

     [For Part 29 : MP4Box -dash 1000 -rap -frag-rap video_29.mp4, MP4Box -dash 1000 -rap -frag-rap audio_29.mp4],

     [For Part 30 : MP4Box -dash 1000 -rap -frag-rap video_30.mp4, MP4Box -dash 1000 -rap -frag-rap audio_30.mp4].

  7. I receive a fragmented file for each file with "_dashinit" being in it e.g. For Part 1 : video_1_dashinit.mp4 and audio_1_dashinit.mp4. These are the files I’m playing through Media Source Extension API.

  So I’m appending these files into my sourceBuffers and playing it with the video. I have given the test.zip file here (https://drive.google.com/file/d/1tyPBTxgpS601Xs5VEWznYhWw9PwhMHsB/view?usp=sharing) containing the test sample.

  I’m using this command in CMD to run Chrome and test my file : chrome.exe --allow-file-access-from-files

  Anyone can use this test sample and see if the video is buffering for them too. Please comment about anything I’m doing wrong, or help me construct a better 5 seconds video and audio files for MSE playable. Thanks