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• Matching a specific media format with ffmpeg/avconv

  5 mai 2020, par Markus A.

  I need to encode a video from static images in such a way that it format-matches another one so I can splice the video streams together.

  



  Here is the mediainfo of the file I'm trying to match :

  



  Video
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Baseline@L3.1
Format settings, CABAC                   : No
Format settings, ReFrames                : 1 frame
Codec ID                                 : 7
Duration                                 : 2mn 46s
Bit rate                                 : 1 614 Kbps
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Standard                                 : NTSC
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Stream size                              : 32.0 MiB (87%)
Color primaries                          : BT.601 PAL
Transfer characteristics                 : BT.601
Matrix coefficients                      : BT.601


  



  So far, what I have been able to come up with is the following :

  



  avconv -f image2 -framerate 1.2 -i loop_%d.tif -c:v libx264 -preset veryslow -profile:v baseline -level:v 31 -b:v 1614K -refs 1 loop.flv


  



  This gets me to :

  



  Video
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Baseline@L3.1
Format settings, CABAC                   : No
Format settings, ReFrames                : 1 frame
Codec ID                                 : 7
Duration                                 : 2s 917ms
Bit rate                                 : 1 614 Kbps
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 1.200 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 1.459
Stream size                              : 575 KiB
Writing library                          : x264 core 142 r2431 a5831aa
Encoding settings                        : cabac=0 / ref=1 / deblock=1:0:0 / analyse=0x1:0x131 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=abr / mbtree=1 / bitrate=1614 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00


  



  Which, unfortunately, still isn't good enough as VLC Media Player crashes hard (just closes), logging main error: Failed to compensate for the format changes, removing all filters; main error: Failed to create video converter as soon as the stream splice occurs. I tried splicing another stream in that does have the exact same encoding, and it works fine. I'm also making sure to only splice on key-frames and I am including the NALU containing the AVCDecoderConfigRecord, so I'm pretty sure I'm not doing anything else wrong, especially since a couple other programs are fine with the splice. It's just VLC that expects an even closer match.

  



  Here are things I've tried :

  



  

  • Adding -vsync 2 to get variable frame rate mode. Doesn't change anything.

  


  • Adding -color_primaries bt470bg -color_trc gamma28 -colorspace bt470bg to try to get BT.601 PAL settings (several websites mentioned this). Doesn't change anything.

  


  • Adding -s ntsc to set the standard to NTSC. This also changes the resolution to 720x480 (not OK), and specifying -s 1280x720 in addition gets rid of the NTSC tag again.

  


  



  If anyone knows what flags I need to supply to get closer, that would be super-helpful ! The stream I'm trying to match is encoded on an Android device (it's a live-stream), so I'm assuming it is built using the standard Android MediaCoder framework, in case that helps.

  


• Getting ffmpeg to work with Heroku

  18 juillet 2020, par scientiffic

  I attempted to install ffmpeg for my Heroku Rails app and now my app is crashing.

  



  I added a buildpack using the following command :

  



  heroku config:add BUILDPACK_URL=https://github.com/shunjikonishi/heroku-buildpack-ffmpeg


  



  After pushing to Heroku, I get the following error according to my logs :

  



  2013-11-17T17:50:44.022351+00:00 heroku[web.1]: Starting process with command `bundle exec rails server -p 47171`
2013-11-17T17:50:46.295602+00:00 app[web.1]: bash: bundle: command not found
2013-11-17T17:50:47.589491+00:00 heroku[web.1]: Process exited with status 127
2013-11-17T17:50:47.597968+00:00 heroku[web.1]: State changed from starting to crashed
2013-11-17T17:50:48.620853+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ (...) fwd="76.118.180.235" dyno= connect= service= status=503 bytes=
2013-11-17T17:50:48.847288+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=(...) fwd="76.118.180.235" dyno= connect= service= status=503 bytes=


  



  When I run heroku run rake db:migrate, I get the error :

  



  Running `rake db:migrate` attached to terminal... up, run.9791&#xA;(in /app)&#xA;rake aborted!&#xA;no such file to load -- bundler/setup&#xA;rubygems/custom_require>:29:in `require&#x27;&#xA;rubygems/custom_require>:29:in `require&#x27;&#xA;/app/config/boot.rb:6:in `<top>&#x27;&#xA;rubygems/custom_require>:29:in `require&#x27;&#xA;rubygems/custom_require>:29:in `require&#x27;&#xA;/app/config/application.rb:1:in `<top>&#x27;&#xA;rubygems/custom_require>:29:in `require&#x27;&#xA;rubygems/custom_require>:29:in `require&#x27;&#xA;/app/Rakefile:5:in `<top>&#x27;&#xA;/usr/local/lib/ruby/1.9.1/rake.rb:2373:in `load&#x27;&#xA;/usr/local/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile&#x27;&#xA;/usr/local/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile&#x27;&#xA;/usr/local/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling&#x27;&#xA;/usr/local/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile&#x27;&#xA;/usr/local/lib/ruby/1.9.1/rake.rb:1991:in `run&#x27;&#xA;/usr/local/bin/rake:31:in `<main>&#x27;&#xA;</main></top></top></top>

  



  When I check the version of bundler I'm using (bundle show bundler), I get :

  



  /Users/(...).rvm/gems/ruby-1.9.3-p448/gems/bundler-1.3.5/lib/bundler.rb:284: warning: Insecure world writable dir /usr/local in PATH, mode 040777
/Users/(...)/.rvm/gems/ruby-1.9.3-p448/gems/bundler-1.3.5


  



  How can I solve this problem ?

  


• Which is the best way to encode videos into multiple resolutions in django ? Should we create a single celery task or to have multiple tasks to encode ? [closed]

  13 septembre 2020, par Danny

  Hey guys Which is the best way to encode videos using ffmpeg into multiple resolutions in django ? Should we create a single celery task which encodes the video and save in database or to have multiple tasks to encode video into various resolutions ? I am new to all these, so any help regarding the best way is highly appreciated.

  


  I have two tasks here to encode into 480 and 1080p..so is it possible to run both in 1 task or the best way is to encode separately ??

  


  Also how does websites like youtube encode ?

  


  @task(name= 'task_video_encoding_480p')
def task_video_encoding_480p(video_id):
    logger.info('Video Processing started')
    try:
        video = 
        input_file_path = 
        output_file_480p_path = 

        for i in range(1):
            new_video_480p = subprocess.call([ffmpeg, {process},output_file_480p_path])

        if new_video_480p == 0:

            video.save()
            logger.info('Video Processing Finished')
            #video.temp_file.delete()
        else:
            logger.info('Proceesing Failed.') # Just for now

    except:
        raise ValidationError('Something went wrong!')


  


  task 2

  


  @task(name= 'task_video_encoding_1080p')
def task_video_encoding_1080p(video_id):
    logger.info('Video Processing started')
    try:
        video = 
        input_file_path = 
        output_file_1080p_path = 

        for i in range(1):
            new_video_1080p = subprocess.call([ffmpeg, {process},output_file_1080p_path])

        if new_video_1080p == 0:

            video.save()
            logger.info('Video Processing Finished')
            video.temp_file.delete()
        else:
            logger.info('Proceesing Failed.') # Just for now

    except:
        raise ValidationError('Something went wrong!')


  


  Thank you. Highly appreciate the help.