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• How to re-stream h265 RTSP stream using FFMPEG

  13 mai 2023, par azharmalik3

  I have written a small piece of code to re-stream camera RTSP stream on Nginx stream server using FFMPEG.

  



  Everything working fine, my re-stream RTSP on to Nginx stream server using following FFMPEG command :

  



  ffmpeg -rtsp_transport tcp -i 'rtsp://212.78.10.88:554/stream' -f lavfi -i aevalsrc=0 -vcodec copy -acodec aac -map 0:0 -map 1:0 -shortest -strict experimental -f flv rtmp://localhost:1935/live/stream


  



  My basic problem is H265 and H265+. FFMPEG failed to re-stream H265 format streams. I tried differently command params but no luck.

  



  Any body know how to re-stream H265 and + in FFMPEG ?

  


• How does ffmpeg divide into frames EXACTLY

  6 décembre 2022, par JFCorleone

  I'm using this piece of code in python to split a video into frames.

  


      def ffmpeg(self, video_file, fps, start_number, **trim_kwargs):
        ffmpeg.input(video_file) \
            .filter('fps', fps=fps) \
            .trim(**trim_kwargs) \
            .output(os.path.join(self._output_dir, f"%0{NAME_PADDING}d.JPG"),
                    **{'qscale:v': 1, 'vsync': 'drop', 'start_number': start_number}) \
            .run()


  


  I sometimes use also trimming options more or less like this :

  


  ffmpeg(video_file, fps, 0, start=XXX,end=YYY)


  


  Additionally, I have a list with timestamps (starting from point zero) with some additional metadata at certain points. I'm trying to figure out what are the mechanics of ffmpeg of using fps for dividing into frames (for example fps = 1), because when I try to jump through my timestamped log manually with the same "fps", I often get less entries than ffmpeg by 1. It's like ffmpeg always took first and last frame or something. Can someone explain to me how it's done exactly, so I could match metadata with generate frames in the best manner ?

  


• FFMPEG : How to mix different types of image sequence inputs when creating multiple streams

  9 août 2021, par chutlies

  I am using a piece of software that generates a .txt files with rendered images. The list within that txt files is printed with the word 'file' at the beginning of the file path.

  


  Ex : file 'file:C :/Users/User/Desktop/test/Test.0001.png'

  


  I am attempting to input another image sequence as an overlay. Everything works fine if I just overlay, scale, and render. So this works fine :

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i C:/test/input.txt -i "C:/test/BALL.%04d.png" -filter_complex "overlay[4K_in];[4K_in]scale=1920:1080[hdOut]" -map [hdOut] hd.mp4


  


  But when I start to split the stream to create different outputs it will only render the overlayed stream [1:v] and not the composited image.

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i C:/test/input.txt -i "C:/test/BALL.%04d.png" -filter_complex "overlay,split=3[mp4HD_in][mxf720_in][mov4K_in];[mp4HD_in]scale=1920:1080[mp4HD_out];[mxf720_in]scale=1280:720[mxf720_out];[mov4K_in]scale=3840:2160[mov4K_out]" -crf 16 -vcodec libx264 -map [mp4HD_out] C:/test/hdMP4.mp4 -vcodec prores -map [mov4K_out] C:/test/MOV4K.mov -vcodec dnxhd -pix_fmt yuv422p -b:v 75M -map [mxf720_out] C:test/MXF720.mxf


  


  If I remove 'file' from the frames file path in the .txt file it works.

  


  Ex : file 'C :/Users/User/Desktop/test/Test.0001.png'

  


  Unfortunately, I am unable to change this as it's being generated and run within a piece of software. Are there any flags or something that I need to add to get around this ? Any other possible techniques beyond starting another &&ffmpeg call to generate the streams over the overlay ?

  


  I do get this in the logs :&#xA;[concat @ 0000024a0eacf280] DTS -230584300921369 < 0 out of order&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;[image2 @ 0000024a0eadd140] Thread message queue blocking ; consider raising the thread_queue_size option (current value : 8)

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