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• avdevice/alldevices : Mark devices as hidden

  13 mars 2024, par Andreas Rheinhardt

  avdevice/alldevices : Mark devices as hidden
  Both GCC and Clang create code that inlines the loops in
  
  next_input() and next_output() at high optimization
  
  levels (presumably when there are not too many devices)
  
  and this code leads to the creation of .got entries :
  
    e7 :	48 3b 3d 00 00 00 00 	cmp    0x0(%rip),%rdi        # ee <av_input_video_device_next+0xe>
  
  			ea : R_X86_64_REX_GOTPCRELX	ff_alsa_demuxer-0x4
  
    ee :	74 43                	je     133 <av_input_video_device_next+0x53>
  
    f0 :	48 3b 3d 00 00 00 00 	cmp    0x0(%rip),%rdi        # f7 <av_input_video_device_next+0x17>
  
  			f3 : R_X86_64_REX_GOTPCRELX	ff_fbdev_demuxer-0x4
  
    f7 :	74 41                	je     13a <av_input_video_device_next+0x5a>
  These relocations can't be fixed up lateron when it is known
  
  that the symbols exist in the same DSO.
  This commit therefore marks these symbols as hidden, leading
  
  to code like this :
  
    f7 :	48 8d 05 00 00 00 00 	lea    0x0(%rip),%rax        # fe <av_input_video_device_next+0xe>
  
  			fa : R_X86_64_PC32	ff_alsa_demuxer-0x4
  
    fe :	48 39 c7             	cmp    %rax,%rdi
  
   101 :	74 55                	je     158 <av_input_video_device_next+0x68>
  
   103 :	48 8d 05 00 00 00 00 	lea    0x0(%rip),%rax        # 10a <av_input_video_device_next+0x1a>
  
  			106 : R_X86_64_PC32	ff_fbdev_demuxer-0x4
  
   10a :	48 39 c7             	cmp    %rax,%rdi
  
   10d :	74 50                	je     15f <av_input_video_device_next+0x6f>
  (Note : It is actually strange that the compiler creates code
  
  that tries to read the addresses from the .got given that the
  
  addresses can be read directly from indev_list/outdev_list.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavdevice/alldevices.c

• can't stream rtsp with ffmpeg

  7 novembre 2017, par xswxw222

  I want to stream rtsp with ffmpeg and ffserver

  I use on this config

  <feed>
  
  
  
  
  
  File /tmp/feed1.ffm
  
  FileMaxSize 200K
  
  
  
  # You could specify
  
  # ReadOnlyFile /saved/specialvideo.ffm
  
  # This marks the file as readonly and it will not be deleted or updated.
  
  
  
  # Specify launch in order to start ffmpeg automatically.
  
  # First ffmpeg must be defined with an appropriate path if needed,
  
  # after that options can follow, but avoid adding the http:// field
  
  #Launch ffmpeg
  
  
  
  # Only allow connections from localhost to the feed.
  
  ACL allow 127.0.0.1
  
  
  
  </feed>
  
  #<stream>
  
  #Format rtp
  
  #Feed feed1.ffm
  
  #VideoCodec libx264
  
  #VideoFrameRate 24
  
  #VideoBitRate 100
  
  #VideoSize 480x272
  
  #AVPresetVideo default
  
  #AVPresetVideo baseline
  
  #AVOptionVideo flags +global_header
  
  #
  
  #AudioCodec libfaac
  
  #AudioBitRate 32
  
  #AudioChannels 2
  
  #AudioSampleRate 22050
  
  #AVOptionAudio flags +global_header
  
  #</stream>

  and run ffserver.
  Now i run the ffmpeg like ffmpeg -i input.mp4 http://x.x.x.x:8090/out.h264.

  When i tried to watch on this url with ffplayer i got 2 error :

  1 : On ffplay terminal I see stream ends prematurely al 0 should be (SOME NUMBER) .

  2 : On ffserver terminal I see max packet size 0 too low   Error writing output header for stream live.h264

  I tried to add -packetsize 9999 but it stil show me those errors

  What can I do to fix that ?

• Modify code so each snippets start from begin instead end

  13 décembre 2022, par Ohiowizard

  source : https://davidwalsh.name/video-preview#comment-515168
  
the part of code that trim videos into snippets :

  


   # Loop and generate video snippets
    mkdir $tempdir
    interval=$(($length/$desiredsnippets-$starttimeseconds))
    for i in $(seq 1 $desiredsnippets)
    do
        # Format the second marks into hh:mm:ss format
        start=$(($(($i*$interval))+$starttimeseconds))
        formattedstart=$(printf "%02d:%02d:%02d\n" $(($start/3600)) $(($start%3600/60)) $(($start%60)))
        echo 'Generating preview part ' $i $formattedstart
        # Generate the snippet at calculated time
        ffmpeg -i $sourcefile -vf scale=$dimensions -preset fast -qmin 1 -qmax 1 -ss $formattedstart -t $snippetlengthinseconds -threads $(nproc) $tempdir/$i.mp4
    done


  


  `

  


  Video length is 3600 (60mins)
  
Desired snippets = 30, that mean 2mins each
  
It always start at 0:02:00 to 0:04:00 -> and so on
  
but i want it start at 0:00:00 (1st snippet) -> 0:02:00 (2nd snippet) -> (this put in code because it said invalid code format)

  


  

  • I want to make it trim from start of each snippets instead end of each snippets.

  


  • This code trim video into multiple parts(snippets) that set by user, and then merged all snippets into one video.