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• asm SIMD sniffer

  1er août 2023, par Андрей Тернити

  There is x264.
It use a lot of x86 asm files. For example pixel-32.asm.
This files can use different SIMD instruction set : mmx, 3DNow !, sse family, others

  


  I need the simple way to automatically analyze every file. I want get which SIMD family in which file are used. How ?

  


  I think every asm file must contain information about which SIMD family it use (or information that no SIMD). Without this information it is very bad idea try to use this files...
  
I am angry, my x86 CPU support mmx and 3DNow ! only, but x264 try call sse, so I get "Illegal instruction" sometimes. I plan to make patch for x264.

  


  P.S. If you can make issues in official repo let me know.

  


  P.P.S. This thread on Doom9 (mirror).

  


• Download brightcove video

  17 mai 2015, par desert877

  So I have sucessfully downloaded flash videos on in the past but for some reason I am having issues with a local news report. The video I am trying to download is :

  http://www.kens5.com/story/news/2015/04/07/one-dead-after-shooting-at-north-side-auto-body-shop/25444855/

  When I check network sources I get the following output :

  http://kens-vh.akamaihd.net/z/video/25446645/25446645_,350,640,1000,2000,.mp4.csmil/3_5e4ebc852f616aa3_Seg1-Frag7?videoId=4159855028001&lineUpId=&pubId=3616287834001&playerId=3626703558001&affiliateId=&als=16.11,30,12.83,3,2176,13298,30,0,0,114,f,7.9,101.94,f,s,SCJIPJRDQHXW,3.4.0,114&hdcore=3.4.0

  I downloaded a tool recommend to me call ffmpeg and ran a command from a forum that said "Invalid data found when processing input". Unable to figure out issue there.

  Does any one know any scripts/code/tools/methods whatever that I can use to download this video ?

  Any help would be great.

• How to create output live stream from bunch of input live streams on the fly with ffmpeg

  27 septembre 2022, par Alex

  Iam looking for a solution how to merge a bunch of live streams into one output live stream with ability to adding new streams and remove old on the fly without output stream stopping.

  


  Something like this command shoud work fine for static number of streams :

  


  ffmpeg -i "rtsp://steam1" -i "rtsp://steam2" -filter_complex "overlay=70:70" -vcodec libx264 -preset ultrafast -f flv rtmp://steam1-stream2-mosaic


  


  But main issue that number of streams is a dynaminc parameter in my case.

  


  I'll try to explain using YouTube as an example and why that "on-the-fly"-logic is important to me. If on start I have two input streams as in command above, and run ffmpeg command to push merged output stream to YouTube, when third input stream is make available, I should somehow add it to main output stream, that already publishing to YouTube. Or, if one of two streams are closed, remove it from published stream.

  


  Obvious solution is to terminate first ffmpeg command with two streams, make new one with new stream list and republish output stream to where I need it. But, when previous output stream stopped, RTMP(S) connection closes, YouTube detect connection loss and close stream, disconnect all viewers, close chat and others. So when ffmpeg pushed new output stream with new stream list, this will be a completely new RTMP(S) connection for YouTube, with empty watch list and chat history.

  


  Main issue is how to add new and remove old streams for single output stream without closing RTMP(S) connection. Modifying existing ffmpeg process looks unavailable, but, maybe, there is some network socket magic, when new ffmpeg process push their output stream to socket that opened by old ffmpeg process. RTMP(S) protocol in this case may generate some errors or "black screen" for a seconds, but this is applicable for me.

  


  ffmpeg is not a requirement : if you can suggest solution with other software, it will be also interesting.