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• Overlay video with alpha using FFmpeg on macOS Catalina... problems

  16 octobre 2019, par jogga

  In previous versions of macOS (10.14 Mojave and older) I used FFmpeg to overlay a video with alpha on top of another video with much success. Now when updated to macOS Catalina the same FFmpeg commands suddenly doesn’t work. It just produces black where the transparency should have been according to the alpha channel. The video I overlay on top is a ProRes 4444 file (which includes an alpha channel) and it no longer works as expected.

  I have tried several versions of FFmpeg from the nightly builds to the latest stable one (version 4.2.1) to no avail. Nothing works :-(

  The simplest form of the command I have been using looks like this :

  ffmpeg -y -i skiing.mp4 -i subtitles.ap4h -filter_complex overlay subtitled.m4v 

  Doesn’t work. But if I replace the subtitles.ap4h file with a simple .png image with alpha, it works ?

  I have also been experimenting with the blend filter, but I really don’t understand the gist of it yet.

  Can someone please shed some light on this. Have anyone else out there seen this problem.

  Do you have any suggestions on how to use the blend filter instead of the overlay filter to accomplish the same task ?

  You can find the sample files I used in my dropbox...

  https://www.dropbox.com/s/8z3grpsbejb1na0/skiing.mp4?dl=0
  https://www.dropbox.com/s/8c79lg07rbuqyhn/subtitles.ap4h?dl=0

  Really looking forward to someone help me solve this mystery.

  Best regards / Jörgen

• Rtsp streaming, no live

  14 août 2018, par Alejandro

  i follow this topic for streaming rtsp here
  now this is my conf in the server : ffmpeg -v info -i rtsp://XXXXX.ddns.net/onvif1 -c:v copy -c:a copy -bufsize 1835k -pix_fmt yuv420p -flags -global_header -hls_time 10 -hls_list_size 6 -hls_wrap 10 -start_number 1 /var/www/html/p433/assets/video/test.m3u8 -loglevel debug

  The client :

  <code class="echappe-js">&lt;script src=&quot;https://cdnjs.cloudflare.com/ajax/libs/hls.js/0.10.1/hls.light.min.js&quot;&gt;&lt;/script&gt;
  &lt;script src=&quot;https://releases.flowplayer.org/7.2.6/flowplayer.min.js&quot;&gt;&lt;/script&gt;
  
  &lt;script&gt;<br />
  
          flowplayer('#player', {<br />
  
              live: true,  // set if it's a live stream          <br />
  
              ratio: 9/16, // set the aspect ratio of the stream<br />
  
              clip: {<br />
  
                  sources: [<br />
  
                      // path to the HLS m3u8<br />
  
                      { type: &quot;application/x-mpegurl&quot;, src: &quot;&amp;lt;?php echo asset_url();?&gt;video/test.m3u8&quot;},<br />
  
                      // path to an optional MP4 fallback<br />
  
                      { type: &quot;video/mp4&quot;, src: &quot;//yourserver/path/index.mp4&quot;}<br />
  
                  ]<br />
  
              }<br />
  
          });<br />
  
  &lt;/script&gt;
  
  

  The problem ? dont show video in "Live", only show 20seconds aprox and the video is loop icon loading

  what am I doing wrong ? I try it all night but I think that it reaches the point of not finding the right path

  thanks for your time !

• compiling FFmpeg on AIX

  3 mars 2017, par epitaxial

  I’m a hardware guy that likes to play around with different architectures and operating systems. Anyhow I’m trying to compile FFmpeg on AIX 7.1 using gcc but having some issues. I grabbed the latest code from git and while it does compile with a few warnings FFmpeg does not work. From my limited understanding it looks like the code is using 64 bit integers but was compiled as 32 bit ? Maybe someone can shed some light on this. Here is what happens when executing FFmpeg

  ./ffmpeg -i rtsp://192.168.1.9:554 -an -c copy -t 1:00:00 test.mp4
  
  ffmpeg version 3.2.git Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8.5 (GCC)
  
  configuration: --enable-nonfree
  
  libavutil      55. 47.100 / 55. 47.100
  
  libavcodec     57. 81.100 / 57. 81.100
  
  libavformat    57. 66.102 / 57. 66.102
  
  libavdevice    57.  2.100 / 57.  2.100
  
  libavfilter     6. 74.100 /  6. 74.100
  
  libswscale      4.  3.101 /  4.  3.101
  
  libswresample   2.  4.100 /  2.  4.100
  
  [NULL @ 20932ac0] Value 0.000000 for parameter 'avioflags' is not a valid    set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 2097664.000000 for parameter 'fflags' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 0.000000 for parameter 'fdebug' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 1.000000 for parameter 'f_err_detect' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 1.000000 for parameter 'err_detect' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtpflags' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtsp_transport' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtsp_flags' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 15.000000 for parameter 'allowed_media_types' is not a valid set of 32bit integer flags
  
  [rtsp @ 20932ac0] Unable to open RTSP for listening
  
  rtsp://192.168.1.9:554: Can't assign requested address

  Is my reasoning correct ? Thanks.