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• How to read a video stream(H.264) bitrate via ffmpeg if the video is VBR

  26 janvier 2021, par Sean

  as stated in the title, if I want to use ffmpeg to read a video bitrate for an h264 stream in MP4/AVI, how does it work ?

  


• How to create a video thumbnail without ffmpeg or HTML5 video canvas ? [duplicate]

  14 mai 2014, par user3631926

  This question already has an answer here :

  • How to generate thumbnails on Amazon S3 ?
    
    2 answers
    

  I need to create a thumbnail from a video, I have tried the below options but they didn’t work for my case. I am using S3 and CloudFront.

  1. ffmpeg is not supported via my hosting because I am using a shared hosting and I need to upgrade to VPS or dedicated server if I want to use ffmpeg.

  2. I tried taking a screenshot from the video using HTML5 drawImage and toDataURL functions, but it is throwing SecurityError because my video file is located on Amazon CloudFront and my code is hosted somewhere else.

  Is there any other option or a workaround to the second option ? I don’t want to upgrade my server for just the thumbnail issue.

• Fail to decode a video with ffmpeg, but it can be played by video player

  23 juin 2022, par south

  i have a video witch can be played by players. But, I failed to decode it using ffmpeg 3.4.
Actually， it failed on the ffmpeg libs compiled by myself, but success on a common ffmpeg-3.4 lib of my company.

  



  My compilation seems success, as i can use it to decode most of my videos.

  



  Whats wrong with my lib ? If i should enable some special options when compiling ?
Anything special on this video ?

  



  error message :

  



  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x31b7120] STSC entry 1 is invalid (first=12 count=0 id=1)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x31b7120] stream 0, contradictionary STSC and STCO
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x31b7120] error reading header


  



  video info dumped when i use libs of my company

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'aaa':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2019-08-06T16:42:23.000000Z
  Duration: 00:00:10.89, start: 0.000000, bitrate: N/A
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 2815 kb/s, 25.66 fps, 25.64 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2019-08-06T16:42:24.000000Z
      handler_name    :
      encoder         : VC Coding
--------------------