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• Loseless FFMPEG compression that supports windows media player

  12 juin 2018, par nmr

  I am trying to create a movie file (avi, mp4, etc as long as it support windows media player) from a sequence of png files using ffmpeg.I am using C++ "System("ffmpeg command")" to create the movie files once I create the png files (this shouldn’t effect movie creation). I was able to create a .avi file using the following command,

  ffmpeg.exe -r 30 -i frame_%7d.png test1.avi

  Once you create the file it runs in windows media player but does not run in VLC. I have realized, it does lossy compression and the movie is not that high quality (quality decreases with frame rate). I want to have lossless compression (or no compression at all) but needs to be able to play in windows media player. So I tried the following commands,

  ffmpeg.exe -framerate 30 -i frame_%7d.png -codec copy test2.avi

  This file ran in VLC but didn’t run in windows media player. Then I tried put in "-pix_fmt yuv420p" but still couldn’t get it to run in windows media player.

  ffmpeg.exe -framerate 30 -pix_fmt yuv420p -i frame_%7d.png -codec copy test2.avi

  I have also tried using "ffv1" codec and it ran in VLC but not in windows media player

  ffmpeg.exe -i frame_%7d.png -c:v ffv1 -qscale:v 0 test4.avi

  So, how do I create a lossless movie file from a sequence of png files using ffmpeg that will run in windows media player ?

• HLS : How to detect out of order segments in media playlist ?

  27 juin 2018, par anirudh612

  What would be an efficient way to detect if an http live streaming VOD playlist has segments out of order (and count how many segments are out of order) ? They are ordered correctly based on the #EXT-X-PROGRAM-DATETIME tag but the segment decoding timestamps in some cases are out of order. Currently, the workflow I’m following is :

  1. Convert the HLS stream into an mp4 using ffmpeg :

     ffmpeg -i http://localhost:8080/test/unsorted.m3u8 -c copy -bsf:a aac_adtstoasc test/unsorted.mp4 &> test/unsorted_ffmpeg.log

  2. Inspect the logs and count number of occurrences of "Non-monotonous DTS in output stream" log messages :

     [mp4 @ 0x7fe74f01b000] Non-monotonous DTS in output stream 0:1 ; previous : 12063760, current : 11866128 ; changing to 12063761. This may result in incorrect timestamps in the output file.

     However, this requires downloading and reading all of the ts segments and is an expensive operation. Is there a more efficient way to determine out of order DTS or PTS in chunks using ffmpeg or ffprobe ?

• 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.