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• rtsp-simple-server store video during publish step in byte

  23 June 2022, by zt1983811

  We are using rtsp-simple-server as our video streaming publisher. In the current repo they provided a step to store the video by command line after the stream is ready like this. However, we don't want to re-stream again to store the video, we would like to store the video during the video bytes publish to rtsp step.

  


  I found the code is here to publish RTP package bytes to RTSP stream. I actually create a function here to store the RTP payload bytes to a file. like following code changes to store video in byte. The output of byte file is here. However when I try to use ffmpeg to convert it to mp4 I got error like following
cmd I use

  


  ffmpeg -i video/output_video_06_23_2022_13.264 -c:v libx264 video/fromh246.mp4


  


  Err:

  


  [h264 @ 0x55c7b595f280] Format h264 detected only with low score of 1, misdetection possible!
[h264 @ 0x55c7b5960dc0] missing picture in access unit with size 16263103
[AVBSFContext @ 0x55c7b5968000] No start code is found.
video/output_video_06_23_2022_13.264: could not find codec parameters
Input #0, h264, from 'video/output_video_06_23_2022_13.264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264, none, 1200k tbn
Output #0, mp4, to 'video/fromh246.mp4':
Output file #0 does not contain any stream



  


  I also tried these are not working as well. The file generated is not playable

  


  ffmpeg  -f rawvideo -pix_fmt yuyv422 -r 25 -s:v 1280x720 -i video/output_video_06_23_2022_13.264 -c:v libx264 abcd.mp4
ffmpeg  -f rawvideo -pix_fmt yuv420p -r 25 -video_size 1280x720 -i video/output_video_06_23_2022_13.264 -c:v libx264 abcdd.mp4


  


  You can check out my stackover_save_video_byte branch. and start server then run following CMD to publish and store the stream to byte file

  


  ffmpeg -re -nostdin -i video/inputVideo.mp4 -vcodec libx264 -preset:v ultrafast -acodec aac -f flv rtmp://localhost:1935/mystream


  


  I read a lot of question here and there, some of the post saying I need add separator (0000x1) I tried it also, not really working. I am wondering few things

  


  

  1. The byte I am saving, is that format in h264 ? (from the byte file header it seems like it)

  


  2. For diff RTP packet do I need to add separator?

  


  3. Before I am saving do I need to do decoder or encoder again? I see the repo is actually did the decode from ACC -> NALU -> encode to RTP. I actually took the RTP payload. Do I need some special things to make the bytes to h264 standard?

  


  


• Revert "avfilter/af_aiir: move response drawing as last step"

  30 May 2020, by Paul B Mahol

  Revert "avfilter/af_aiir: move response drawing as last step"
  This reverts commit ca7095a9072fab4cdb41af12da9d94752e082e34.
  

  • [DH] libavfilter/af_aiir.c

• How to concat the mp3 file and webm file into a new webm file?

  12 August 2015, by it_is_a_literature

  There is a webm file that contains no audio. I want to merge an audio file with this video. I’ve tried the following command:

  ffmpeg -i /home/test.mp3  -i /home/output.webm -vcodec copy -acodec copy /home/newtest.webm

  And received the error:

  Could not write header for output file #0 (incorrect codec parameters ?):         Invalid argument.