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• Pseudo-streaming mp4 files does not work with flash player

  11 mai 2013, par faridv

  I've got a problem with streaming audio on my website. I thought I could put the MP3 file inside an MP4 container with h264 codec, so I can use pseudo-streaming ability of mp4 codec.

  The code I'm using to convert my files is :

  ffmpeg -i 1.mp3 -y -b:a 32K -vn 1.mp4

  Pseudo-streaming (seeking in not-loaded parts of media) now works in HTML5 player but not in any Flash media players such as JWPlayer or FlowPlayer.

  I've tested my files on both Apache server with h264 module enabled and Nginx with mod_mp4 enabled, but without any lucks.

  I tried MP4Box, QTIndexSwapper and even creating a real video file by mixing of an image loop and my audio file.

  ffmpeg -y -i joojoo.png -i 2.mp3 -vcodec mjpeg havij.mp4
  
  MP4Box -add havij.mp4 -isma havij_new.mp4

  What am I doing wrong ? What can I do to make it work ?

• ffmpeg and libx264 videos do not play on video player

  24 décembre 2019, par Tobi

  for a few months now I encountered a problem using FFmpeg in combination with the video code h264. The video generation works fine and without any errors. I am using the following script since 2015 to build my videos from single pictures :

  #!/bin/bash                                                                     
  
  # ------------------------------------------------------------------------------
  
  #                                                                               
  
  # Video generator                                                               
  
  # Tobias Holzmann                                                               
  
  # Date: 18.03.15                                                                
  
  # Update: 24.12.2019                                                            
  
  # Switch back to ffmpeg from avconv                                             
  
  #                                                                               
  
  # ------------------------------------------------------------------------------
  
  
  
  frameRate=30                                                                    
  
  vcodec="h264"                                                                   
  
  crf=18              # Between 0-51; 23 is default. 0 = lossless                 
  
  
  
  
  
  # ------------------------------------------------------------------------------
  
  
  
  ffmpeg \                                                                        
  
      -f image2 \                                                                 
  
      -r $frameRate \                                                             
  
      -i animation.%4d.png \                                                      
  
      -r $frameRate \                                                             
  
      -crf $crf \                                                                 
  
      -vcodec $vcodec \                                                           
  
      AVideo.flv                                                                  
  
  
  
  
  
  # ------------------------------------------------------------------------------

  Today I made it a bit more fancy and easier to use. However, the problem is, that all videos I generate with h264 do not play at all using the vlc player or the common Ubuntu video player. I get errors such as :

  shorty@animation: vlc AVideo.flv 
  
  VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
  
  [000055c0e70af420] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
  
  [NULL @ 0x7fe318c2c2a0] Invalid NAL unit size (30490 > 15039).
  
  [NULL @ 0x7fe318c2c2a0] missing picture in access unit with size 15733
  
  [h264 @ 0x7fe318c2c2a0] Invalid NAL unit size (30490 > 15039).
  
  [h264 @ 0x7fe318c2c2a0] Error splitting the input into NAL units.
  
  [00007fe324c1c420] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library  430.50  Thu Sep  5 22:38:52 CDT 2019 for hardware decoding
  
  [h264 @ 0x7fe325428ac0] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324c1fb00] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324eb9d80] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ed6080] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ef2400] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324f0e780] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe325428ac0] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324c1fb00] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324eb9d80] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ed6080] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ef2400] hardware accelerator failed to decode picture
  
  [00007fe324c1c420] main decoder error: buffer deadlock prevented
  
  [h264 @ 0x7fe324f0e780] hardware accelerator failed to decode picture
  
  ...
  
  ...

  I am wondering if someone does know where the problem is located. Any hint or feedback is appreciated. Thank you in advance and kind regards, Tobi.

• FFMPEG HLS streaming and transcoding on the fly to HTML player - video duration changes while transcoding

  20 août 2019, par Thomas Tho

  I am trying to make a video streaming server and watch videos directly from web browser. The idea is to make the server to stream video from remote server, transcode with different audio format in local server, and then instantly stream to the client (this is specific way I need it to function).
  This is the FFMPEG code im currently using :

  ffmpeg -i "url" -c:v copy -c:a aac -ac 2 -f hls -hls_time 60 -hls_playlist_type event -hls_flags independent_segments out.m3u8

  The HLS stream is attached to the HTML player with hls.js and it works. However, the video duration is constantly changing while video is being transcoded. I have tried to change video duration with JS like $('video').duration = 120;with no luck.

  How do i make the player to display the video file duration instead of stream current transcoded time ?

  I am also planning to implement video seeking but i am clueless. The current idea is to send seeking time to the server, terminate ffmpeg, and start from specific time. However, i think the player might get stuck on loading and will not start playing without reloading.