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• Unable to decode media issue on chrome browser

  20 octobre 2018, par Shrikant D

  I am experiencing an issue while playing media on my application. I am using html5 player which works fine on another browser but the media not worked on Google Chrome. Below is the ffmpeg output.

  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
  
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
  
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
  
  
    libavutil      55. 78.100 / 55. 78.100
  
  
  
    libavcodec     57.107.100 / 57.107.100
  
  
  
    libavformat    57. 83.100 / 57. 83.100
  
  
  
    libavdevice    57. 10.100 / 57. 10.100
  
  
  
    libavfilter     6.107.100 /  6.107.100
  
  
  
    libavresample   3.  7.  0 /  3.  7.  0
  
  
  
    libswscale      4.  8.100 /  4.  8.100
  
  
  
    libswresample   2.  9.100 /  2.  9.100
  
  
  
    libpostproc    54.  7.100 / 54.  7.100
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sources-5a6b388fb093f.mp4':
  
  
  
    Metadata:
  
  
  
      major_brand     : mp42
  
  
  
      minor_version   : 0
  
  
  
      compatible_brands: mp42mp41
  
  
  
      creation_time   : 2017-10-31T01:45:10.000000Z
  
  
  
    Duration: 00:04:55.72, start: 0.000000, bitrate: 10300 kb/s
  
  
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9975 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
  
  
  
      Metadata:
  
  
  
        creation_time   : 2017-10-31T01:45:10.000000Z
  
  
  
        handler_name    : Alias Data Handler
  
  
  
        encoder         : AVC Coding
  
  
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
  
  
      Metadata:
  
  
  
        creation_time   : 2017-10-31T01:45:10.000000Z
  
  
  
        handler_name    : Alias Data Handler

  The issue is replicable on Windows, Linux/Ubuntu and Mac on Google Chrome browser.

  UPDATED :

  render_id: 56
  
  player_id: 0
  
  origin_url: https://example.com/
  
  frame_url: https://example.com/node/83810
  
  frame_title: 
  
  url: https://example.com/sites/default/files/sources-5a6b388fb093f.mp4
  
  total_bytes: 380754023
  
  streaming: false
  
  single_origin: true
  
  passed_cors_access_check: false
  
  range_header_supported: true
  
  pipeline_state: kStopped
  
  info: Selected FFmpegVideoDecoder for video decoding, config: codec: h264 format: 1 profile: h264 main coded size: [1920,1080] visible rect: [0,0,1920,1080] natural size: [1920,1080] has extra data? true encryption scheme: Unencrypted rotation: 0°
  
  audio_channels_count: 2
  
  audio_codec_name: aac
  
  audio_sample_format: Float 32-bit planar
  
  audio_samples_per_second: 48000
  
  bitrate: 10300299
  
  found_audio_stream: true
  
  found_video_stream: true
  
  height: 1080
  
  max_duration: 295.722667
  
  start_time: 0
  
  time_base: 1/60000
  
  video_codec_name: h264
  
  video_format: PIXEL_FORMAT_I420
  
  video_is_encrypted: false
  
  width: 1920
  
  audio_dds: false
  
  audio_decoder: FFmpegAudioDecoder
  
  video_dds: false
  
  video_decoder: FFmpegVideoDecoder
  
  audio_buffering_state: BUFFERING_HAVE_ENOUGH
  
  video_buffering_state: BUFFERING_HAVE_ENOUGH
  
  for_suspended_start: false
  
  pipeline_buffering_state: BUFFERING_HAVE_ENOUGH
  
  duration: 295.722667
  
  event: PAUSE
  
  error: video decode error
  
  pipeline_error: PIPELINE_ERROR_DECODE

  Added chrome Player Properties for specific media.

• 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

• Flash Media Server Recording Delay

  14 novembre 2011, par Corey

  I have an application where a user can record themselves singing along to a song. Once I receive the NetStream status event 'Record.Start' I start playing an audio file. Once the audio completes, I stop recording. Next, I have a script that runs FFMPEG to combine the recorded video/audio with the same music file. The problem I'm finding is that there is a noticeable delay between the recorded audio and the music. It seems also that this delay depends on network speed as it varies depending on the network. Can I determine this delay through the FMS dynamically ?