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• Merging multiple (more than two) videos on Ubuntu

  27 décembre 2020, par Dhruv Singal

  I want to merge videos in batch size of twenty (20) each. I'm running a Linux machine. The videos are in mp4 format and moderate quality. Some even have the audio stream missing. So far I've tried ffmpeg, mencoder, cvlc/vlc and MP4Box. I want to write a command line script to achieve this, since I'm doing batch processing.

  



  The main issue is that some of the solutions I tried work well for two videos, some work well for videos with audio stream and yet others work well for some other subset of my video set. However, I have not been able to find a comprehensive solution for this task.

  


• ffmpeg rtmp webcam live stream iphone/pad segment size too big

  1er février 2013, par Foo Barazz

  I'm transcoding a rtmp stream from a red5 server for use to live stream on a iphone or ipad device. I built latest ffmpeg version from git repo using the built in segmenter to create .ts files and m3u8 playlist file using the following :

  ffmpeg -probesize 50k -i "rtmp://localhost/oflaDemo/red5StreamDemo live=1" \
  
  -c:v libx264 -b:v 128k -vpre ipod320 -flags -global_header -map 0 \
  
  -f segment -segment_time 3 -segment_list foo.m3u8 -segment_list_flags +live \
  
  -segment_list_type m3u8 -segment_list_size 5 -segment_format mpegts foo%d.ts

  This works fine, but I can't get the segment size smaller than about 12 sec even set to 3 (-segment_time 3). It seems to be caused by libx264 vcodec.
  Am I missing any flag ?

  By the way, you can simple run the ffmpeg command above successfully by starting red5 SimpleBroadcaster example.

• Facebook live video can only be previewed while streaming my Mac screen

  24 janvier 2017, par iownthegame

  I use the following ffmpeg command to share my screen streaming to Facebook.

  

  ffmpeg -f avfoundation -r 10 -video_size 352x288 -i "0" -c:v h264 -f flv 
  
  "rtmp://rtmp-api.facebook.com:80/rtmp/1269140699772419?ds=1&a=AaYsXcYcdHQrrrUF"

  then I can see the video preview scenes
  

  however, once I press the ’Go Live’ button, and go to my facebook page, I can find a post said I am Live Now. When I press the ’play button’, there are only black scenes that last for 1 2 seconds, and the video ends.

  

  And there is also a weird thing, the video can be played when I end up the live stream. When refreshing the page, I can find a post said I was Live, the video of this post can be played successfully.

  Anyone knows why the video can be watched when previewing and finishing live but not the exact live moment ?

  [updated]

  During the live streaming period, if I press the play button, there are only 1 2 seconds black scenes and the live stream ends.
  

  However if I press the video frame again, another modal pops up then I can see the live streaming. Is it a facebook bug ?