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• ffmpeg created video from images does not play in jwplayer

  10 septembre 2013, par user2281222

  I have created a video from images with ffmpeg. Created video plays fine in my local machine with vlc. But it does not play in jwplayer/any web player.

  Commands used :

  ffmpeg -f image2 -r 1/4 -i image_%d.png -c:v libx264 -pix_fmt yuv420p -vf fps=fps=30 int_video.mp4
  
  
  
  ffmpeg -i int_video.mp4 -c:v libx264 -b:v 500k -pix_fmt yuv420p final.mp4"

  Information about the create video is as below :

          General
  
          Complete name                    : /home/oodles/git/picdeo/web-app/uservideos/admin/z4/username_admin__s3vidname_z4.mp4
  
          Format                           : MPEG-4
  
          Format profile                   : Base Media
  
          Codec ID                         : isom
  
          File size                        : 691 KiB
  
          Duration                         : 20s 34ms
  
          Overall bit rate                 : 282 Kbps
  
          Writing application              : Lavf55.12.100
  
  
  
          Video
  
          ID                               : 1
  
          Format                           : AVC
  
          Format/Info                      : Advanced Video Codec
  
          Format profile                   : High@L3.0
  
          Format settings, CABAC           : Yes
  
          Format settings, ReFrames        : 4 frames
  
          Codec ID                         : avc1
  
          Codec ID/Info                    : Advanced Video Coding
  
          Duration                         : 20s 34ms
  
          Bit rate                         : 279 Kbps
  
          Nominal bit rate                 : 500 Kbps
  
          Width                            : 480 pixels
  
          Height                           : 360 pixels
  
          Display aspect ratio             : 4:3
  
          Frame rate mode                  : Constant
  
          Frame rate                       : 30.000 fps
  
          Color space                      : YUV
  
          Chroma subsampling               : 4:2:0
  
          Bit depth                        : 8 bits
  
          Scan type                        : Progressive
  
          Bits/(Pixel*Frame)               : 0.054
  
          Stream size                      : 683 KiB (99%)
  
          Writing library                  : x264 core 135 r2 f0c1c53
  
          Encoding settings                : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=1 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

  How can I use ffmpeg to create a video that works in jwplayer ?

• How to debug ffmpeg-static in a AWS Lambda layer

  31 mars 2021, par boblapointe

  I have an AWS Lambda layer containing nodejs ffmpeg-static. Calling "ffmpeg.path" will return the correct location of the ffmpeg executable in the layer.

  



  But any call to ffmpeg will stop silently, making it impossible for me to know what caused the error. Here is my test function :

  



  const exec = require( "child_process" ).exec
const ffmpeg = require( "ffmpeg-static" )
exports.handler = async (event, context, callback ) => {
    console.log( ffmpeg.path ) // Outputs: "/opt/nodejs/node_modules/ffmpeg-static/bin/linux/x64/ffmpeg"
    exec( ffmpeg.path + " -version",
        function( error, stdout, stderr ) {
            console.log( stdout ) // Nothing
            console.log( stderr ) // Nothing
            if ( error ) {
                console.log( error ) // Nothing
            }
        }
    )


  



  The exec() callback is never triggered. How can I identify the problem ?

  


• Force ffmpeg to exit with error code whenever thumbnail isn't successfully created

  12 janvier 2017, par user779159

  To get a thumbnail from an image at 100 seconds I can do ffmpeg -ss 100 -i /tmp/video.mp4 -frames:v 1 -s 200x100 image.jpg. However, if the video is less than 100 seconds, ffmpeg doesn’t create a thumbnail but also doesn’t exit with any error code, which is quite unexpected.

  The command exits with no error code (exit status of 0). It only outputs a message on stderr saying Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used).

  I would like ffmpeg to exit with an error code under any situation where a thumbnail hasn’t been created. Otherwise I’ll always have to do another check from my application code after the ffmpeg command to ensure that the expected number of thumbnails has been output to the filesystem.

  Is there a way around having to do this application-level check, and force ffmpeg to fail whenever it doesn’t successfully write a thumbnail to the filesystem ?