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• lavc/cbs_av1 : Save more frame ordering information

  20 mars 2024, par Mark Thompson

  lavc/cbs_av1 : Save more frame ordering information
  This is wanted by the Vulkan decoder.
  

  • [DH] libavcodec/cbs_av1.h
  • [DH] libavcodec/cbs_av1_syntax_template.c

• Save .mp4 from YouTube output stream

  15 mai 2023, par walolinux

  I am currently running a Ffmpeg script in Raspbian which works fine. It captures video from an USB webcam and stream it to YouTube.

  


  ffmpeg -thread_queue_size 512 -f v4l2 -video_size 1920x1080 -i /dev/video0 -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -acodec aac -ab 128k -strict experimental -aspect 16:9 -vcodec h264 -preset veryfast -crf 25 -pix_fmt yuv420p -g 60 -vb 820k -maxrate 820k -bufsize 820k -profile:v baseline -r 30 -f flv rtmp://a.rtmp.youtube.com/live2/XXX-XXX-XXX


  


  But I also want to save the file into an mp4 file.

  


  I have tried adding a .mp4 file to the end, but it generates a corrupt file and the stream does not emit at 1x speed, it get slower to 0.4x

  


  ffmpeg -thread_queue_size 512 -f v4l2 -video_size 1920x1080 -i /dev/video0 -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -acodec aac -ab 128k -strict experimental -aspect 16:9 -vcodec h264 -preset veryfast -crf 25 -pix_fmt yuv420p -g 60 -vb 820k -maxrate 820k -bufsize 820k -profile:v baseline -r 30 -f flv rtmp://a.rtmp.youtube.com/live2/XXX-XXX-XXX output.mp4


  


  I have also tried without result :

  


  -vcodec copy -acodev copy output.mp4


  


  Any idea ? Thanks.

  


• Capture & save MJPG CCTV stream to file w. FFMPEG

  21 juin 2021, par GBano

  I've been trying to record an IP-cam stream (Foscam, mjpg) via http with ffmpeg.
Can't get the rtsp stream for some reason, but the http/mjpg works fine (VLC IDed it as mjpg).

  


  The stream URL looks like this :
http://192.168.1.123:456/videostream.cgi?user=USERNAME&pwd=PWD

  


  So I created the string (w.o line wrap) :
ffmpeg -i -loglevel debug http://192.168.1.123:456/videostream.cgi?user=USERNAME&pwd=PWD /home/user/Videos/camera.mp4

  


  Some examples I saw are using -c copy and map 0 options as well but I left this out since I defined source and destination clearly and this is just a video, no audio.
segment_time and segment_format I also left out for now (I'd like segments later though- when it's working).

  


  FFMPEG returns : "bash: /home/user/Videos/camera.mp4: No such file or directory"

  


  So I tried a random mjpg stream from the net (Insecam is a nice source for this...) : http://58.69.178.54:80/mjpg/video.mjpg

  


  Leading to :
ffmpeg copy -i -loglevel debug -hide_banner http://58.69.178.54:80/mjpg/video.mjpg /home/user/Videos/camera.mp4

  


  Returns : -loglevel: "No such file or directory" (the same with segment options included, copy excluded).

  


  Shouldn't FFMPEG create the destination file ?

  


  One example mixed FFMPEG with CVLC (Save continuous RTSP stream to 5-10 minute long mp4 files) so I just tried with cvlc.
cvlc http://58.69.178.54:80/mjpg/video.mjpg copy /home/user/Videos/camera.mp4
This opens the stream in a VLC window (despite that I use Cvlc) but does not create a destination file.

  


  I suspect I must have missed something simple & silly, but what ?