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• FFmpeg playable MP4 segmented video from RTSP

  5 février 2021, par Michael Novotný

  I have problem with creating playable uncomplete MP4 file created from FFMPEG. In my case I have some infinite RTSP stream (h.264) from IP camera.
My target is record this stream to MP4 files for playback. If i use FFMPEG mp4 muxer, work correctly.

  


  /usr/bin/ffmpeg -progress pipe:5 -use_wallclock_as_timestamps 1 -analyzeduration 10000000 -probesize 10000000 -fflags +igndts -rtsp_transport tcp -hwaccel auto -loglevel warning -i rtsp://****:****@*******:****/ -y -an -vcodec copy -strict experimental -movflags frag_keyframe+empty_moov -f segment -segment_format mp4 -segment_format_options movflags=+faststart -segment_atclocktime 1 -reset_timestamps 1 -strftime 1 -segment_time 15 /Shinobi/videos/bWkwjTWdRt/Rm67cYyq50/test-%S.mp4


  


  FFMPEG will create one MP4 file which still increasing its size. If I try copy or simply open this (uncomplete, still increased ... of course :) ) file, it's correcly play. But it's still only one file ... still bigger and bigger. For long-term recording cam (few weeks) it's not good.
I want segment this stream to multiple smaller MP4 files (as you knows from another typical NVR systems). For example : segment for 30minutes.
I used "segment" muxer.

  


  /usr/bin/ffmpeg -progress pipe:5 -use_wallclock_as_timestamps 1 -analyzeduration 10000000 -probesize 10000000 -fflags +igndts -rtsp_transport tcp -hwaccel auto -loglevel warning -i rtsp://*****:****@*********:****/ -y -an -vcodec copy -strict -2 -movflags frag_keyframe+empty_moov -f mp4 -segment_atclocktime 1 -reset_timestamps 1 -strftime 1 -segment_list pipe:8 -segment_time 15 /Shinobi/videos/bWkwjTWdRt/Rm67cYyq50/test-%S.mp4


  


  It looks like work correctly. New file with defined mask is created every 30 minutes. If I try copy or simply open(and play) anyone "completed 30min segment file" it"s works correctly. Problem is with last file (more precisely : newest, still uncompleted last segment file) - it's not playable (moov atom not found).

  


  I Googled my problem many time with another keywords. I was try many my wonders. I readed FFMPEG documentation maybe 5times.

  


  Problem is with second passthroug which "segment muxer" do (which do -movflags +faststart .. for example). It's logicaly, second passthroug not be did in last(newest) file yet.

  


  Is there way to make it work ? If I want see time for 2-3 mins ago it's no possible wait up to 30minutes for "complete segment" ... and at the same time it is not possible to have a billion files with 2-3sec segments.
How did other NVR systems solve this ? Synology, Hikvision and more has in their file system recorded MP4 soubory which one of them is still uncompleted, still growing, but normaly PLAYABLE.

  


  A few last days I tried this with no success. I'am absolutely angry and sad. I hope that my text is understandable

  


  Thank you

  


  This options has no effect in my case (tried) :

  


  -movflags frag_keyframe+empty_moov

  


  -movflags faststart

  


  -movflags separate_moof

  


  -fragsize *** / -fragtime ***

  


  -strict -2 / -strict experimental

  


• How to process single segment from fragmented mp4 container ?

  14 septembre 2020, par user14258924

  I have fragmented mp4 that I stream. First the mp4 header and then individual segments that are each one GOP. It is h264 and aac encoded video that I am getting from RTMP server.

  


  I would like to process these individual segments with ffmpeg(I doubt there are other tools available). Either adjust resolution or bitrate or even transcode to vp8/9 or avi1 if needed.

  


  But it seems that ffmpeg cannot handle this because the segment has no header. So I wodner if there is a flag or set of flags for ffmpeg to be able to process these segments without the header ? I could possibly just take the raw h264 and aac packets from the RTMP and not pack it into MP4 container beforehand, if that helps - would ffmpeg be able to process these ?

  


• Faster frame extraction than ffmpeg

  23 janvier 2013, par Ben Ford

  I have a video analytics program that processes assorted frames from a video. (Several hours long)
  The video is likely going to be an MP4 but may be other formats going forwards.

  At the moment, I have a C# wrapper around an ffmpeg call to extract an individual frame at the requested time. (I'm using the ffmpeg.exe binary. Not the libraries directly)
  At the moment, this all works. But it's slow. Very slow.

  I've found ways to improve the speed by storing the extracted frames in a ramdisk while they're being processed. Changing the stored image format etc...

  I just wanted to check if anyone could think of any way to pull individual frames out. At split-second accuracy.
  I know this is probably possible with DShow etc... I went straight to FFMPEG as I've used it before. But if DShow is likely to be faster I'll gladly change !