Sur d’autres sites (13252)

• send point to point video stream using ffmpeg with rtsp (c++)

  8 décembre 2015, par seleciii44

  I need to send a h264 encoded video stream to a(only one) specific IP address with RTSP protocol on a windows PC with C++. I’m trying to use the FFMPEG library.

  I used the example in this post and i can play the stream as :

  ffplay -rtsp_flags listen -i rtsp://127.0.0.1:8554/live.sdp

  The problem is, according to the solution of post i need a server. Where -rtsp_flags listen option of ffplay behaves like a server.

  On the other hand, according to StreamingGuide of ffmpeg i can send a point to point stream like :

  ffmpeg -i INPUT -acodec libmp3lame -ar 11025 --f rtp rtp://host:port

  This is fine and works well. But i need to use rtsp. According to StreamingGuide again,

  Another option is to use RTP (which by default uses UDP) but by
  specifying it use TCP :

  ffmpeg -i input -f rtsp -rtsp_transport tcp rtsp://localhost:8888/live.sdp

  which seems to be what i’m looking for. Yet the ffmpeg tool seems to be doing nothing when i try this method (don’t know why i need tcp,but udp does not work neither). Why is that ?

  FFMPEG protocols documentation, says that i need to use a media server to send the video.

  • Why would i need a media server to just send the video stream to another PC or whatever ?
  • If i need a media server, how does the IP Camera sends the stream ?
  • If i have no option but to use a media server, could some one please recommend a server for Windows 7 ?
    • ffserver is only for linux
    • live555mediaServer seems to be used for local files or am i wrong ?
    • ..?

  Best regards,
  Gokhan.

• Anomalie #3014 : Chaines de langue de "Forums" utilisées dans la "dist"

  24 décembre 2017, par b b

  Pour info, voici les occurrences de chaînes de langue de forum dans la dist à ce jour :

  grep -nHIirF —exclude=*.svn-base — :forum : .
  ./404.html:36 :            [(#ENVfond_erreur|==forum|oui)
  
  <:forum:aucun_message_forum :>
  
  ]
  
  ./article.html:56 :            [
  <:forum:form_pet_message_commentaire :>
  ./inclure/forum.html:17 :                [(#CONFIGforums_titre| !=non|oui)#COMPTEUR_BOUCLE.
  
  ./inclure/forum.html:42 :                        [(#CONFIGforums_titre| !=non|oui)#COMPTEUR_BOUCLE.
  
  ./forum.html:11 :    
  
  ./forum.html:25 :
  
  <:accueil_site :> &gt ; ... &gt ; <:forum:forum :> #ID_FORUM
  
  ./forum.html:28 :                [
  (#TITRE|sinon<:forum:forum :> #ID_FORUM)
  ]
  
  ./forum.html:38 :
  <:forum:forum_avez_selectionne :> #TITRE
  
  ./forum.html:41 :            [
  <:forum:form_pet_message_commentaire :>
  ./breve.html:43 :            [
  <:forum:form_pet_message_commentaire :>
  
  

• ffmpeg - Timecode & Fractional Frame Rate (Duplicating Frames)

  29 mars 2018, par Nimble

  I record two different frame rates using ffmpeg, 60 and 100. Or at least I thought I was recording 60 and 100, now it seems it’s actually 59.94 and 99.98.

  Here is the command I was using :

  ffmpeg -y -thread_queue_size 9999 -guess_layout_max 0 -f dshow -video_size 1920x1080 -rtbufsize 2147.48M -framerate 60 ^
  
  -pixel_format yuyv422 -i video="Game Capture HD60 S (Video) (#01)":audio="ADAT (5+6) (RME Fireface UC)" -map 0:0,0:1 ^
  
  -map 0:1 -c:v h264_nvenc -preset: llhp -pix_fmt yuv420p -b:v 40M -minrate 40M -maxrate 40M -bufsize 40M -b:a 384k -ac 2 ^
  
  -r 60 -af "pan=mono|c0=c0, adelay=84" -vsync 1 -max_muxing_queue_size 9999 -f segment -segment_time 600 ^
  
  -segment_wrap 9 -reset_timestamps 1 C:\Users\djcim\Videos\PC\Camera\CPC%02d.ts ^
  
  -thread_queue_size 9999 -f dshow -video_size 3440x1440 -rtbufsize 2147.48M -framerate 100 -pixel_format nv12 ^
  
  -itsoffset 00:00:00.215 -i video="Video (00 Pro Capture HDMI 4K+)" -thread_queue_size 9999 -guess_layout_max 0 -f dshow ^
  
  -rtbufsize 2147.48M -i audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map 1:0,2:0 -map 6:0 -c:v h264_nvenc -preset: llhp ^
  
  -pix_fmt nv12 -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M -b:a 384k -ac 2 -r 100 -af "adelay=141|141" -vsync 1 ^
  
  -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ^
  
  C:\Users\djcim\Videos\PC\PC\PC%02d.ts

  I thought all was well with my frame rates, sure ffmpeg was duplicating frames every once in a while, but I thought it was just a random occurrence caused by ffmpeg dropping a frame during processing and therefore needed to duplicate one to make it up. I didn’t think duplicating a few frames would be noticeable in the footage... until I was reviewing some from the first output, which is actually a camera, and noticed very slight stutters consistently 3 times a minute. This began to bug me, it was very noticeable and I wanted smooth footage. A bit confused I decided to try the first output by itself and watch ffmpeg to see when frames were being duplicated and found that it was duplicating frames every 17 second (16.66 to be more precise).

  After doing the math (1/16.66=.06) I realized that the frame rate of that first capture card was actually 59.94. Doing the same thing for the other output I found that my "100fps" footage is actually 99.98. But what does that really entail ?

  Should I change the fps to 59.94 and 99.98 ? Wont that cause synchronization issues as 99.98 (100*.0002=99.98) isn’t the same standard as 59.94 (60*.001=59.94) ? Or does that mean I just need to set the second output to 99.9 (100*.001=99.9) to match the standard of the first output and drop frames ? If that is the case does this mean in my editing program, Adobe Premiere, I would need to export the final video as 59.94fps not 60fps to avoid duplication of frames ? Or is there some method within timecode that remedies this issue ?

  I guess I just really don’t understand drop frame and non-drop frame timecode / timecode in general. Up until yesterday when something said 60fps I thought it meant literally 60fps but I guess 99% of the time it actually means 59.94. I’d really like to just avoid the duplication of frames as it ruins what would be a smooth experience but don’t know if I can while trying to keep everything synchronized.

  Any help or insight would be appreciated, sorry if my question is a bit confusing I am undoubtedly confused.