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• Use ffmpeg to segment streaming video

  7 juin 2016, par Marc

  Suppose I have a streaming video URL rtsp ://whatever and I wish to store that video stream to my file system as a series of files off approximately the same size or duration. Ideally I would like to store the files with a start and stop timestamp as part of the filename, and each file should be such that it can stand on its own to be displayed as a video file if someone wants to view it. I understand that ffmpeg has a segment command option that allows me to segment by time and store in a series of files like outfile%3d.dat or whatever. But suppose I want to do this perpetually and cycle the files (age out old ones) when the total size of all the saved files exceeds a specific value. For example, suppose I want to save the most recent 500GB of video from this streaming URL and keep doing this day after day continuously into the distant future. What happens to the output filename after outfile999.dat is saved ? Does the count start over at 0 ? Or does ffmpeg just stop or crash ? Is there an ffmpeg command that can segment and age out old files, or is this something I would have to do running another program simultaneously or would I have to hack into ffmpeg itself to do this ? I’m pretty new to ffmpeg so any suggestions you ffmpeg experts might have on how to do this would be welcome. I also welcome suggestions for other command line Linux tools that might be better for this application.

  UPDATE : So it turns out that ffmpeg has a segmenter built in, and I can segment the files such that the filenames have the video start datetime as part of the filename. I used a command like this :

  ffmpeg -i rtsp://camera_feed_url_here -c copy -f segment -segment_list out.list -segment_time 900 \ -segment_atclocktime 1 -strftime 1 "%Y-%m-%d_%H-%M-%S.mkv"

  That’s the good news. The bad news is that when I run this command, after about 1 minute it just throws this error and stops :

  rtsp ://camera_feed_url_here : Invalid data found when processing input

  No other error or diagnostic mesages are printed out. Even when I run with -loglevel debug, it just seems to die with this error message.

  When I built ffmpeg, used this :

  ./configure --enable-demux='rtsp,rtp,sdp,flac,gif,image2,image2pipe,matrosk' --enable-network --enable-protocols --enable-decoder=h264

  Any ideas what I’m doing wrong and how I can make this error go away ?

• Use ffmpeg to segment streaming video

  4 décembre 2022, par Marc

  Suppose I have a streaming video URL rtsp ://whatever and I wish to store that video stream to my file system as a series of files off approximately the same size or duration. Ideally I would like to store the files with a start and stop timestamp as part of the filename, and each file should be such that it can stand on its own to be displayed as a video file if someone wants to view it. I understand that ffmpeg has a segment command option that allows me to segment by time and store in a series of files like outfile%3d.dat or whatever. But suppose I want to do this perpetually and cycle the files (age out old ones) when the total size of all the saved files exceeds a specific value. For example, suppose I want to save the most recent 500GB of video from this streaming URL and keep doing this day after day continuously into the distant future. What happens to the output filename after outfile999.dat is saved ? Does the count start over at 0 ? Or does ffmpeg just stop or crash ? Is there an ffmpeg command that can segment and age out old files, or is this something I would have to do running another program simultaneously or would I have to hack into ffmpeg itself to do this ? I'm pretty new to ffmpeg so any suggestions you ffmpeg experts might have on how to do this would be welcome. I also welcome suggestions for other command line Linux tools that might be better for this application.

  



  UPDATE : So it turns out that ffmpeg has a segmenter built in, and I can segment the files such that the filenames have the video start datetime as part of the filename. I used a command like this :

  



  ffmpeg -i rtsp://camera_feed_url_here -c copy -f segment -segment_list out.list -segment_time 900 \ -segment_atclocktime 1 -strftime 1 "%Y-%m-%d_%H-%M-%S.mkv"


  



  That's the good news. The bad news is that when I run this command, after about 1 minute it just throws this error and stops :

  



  rtsp ://camera_feed_url_here : Invalid data found when processing input

  



  No other error or diagnostic mesages are printed out. Even when I run with -loglevel debug, it just seems to die with this error message.

  



  When I built ffmpeg, used this :

  



  ./configure --enable-demux='rtsp,rtp,sdp,flac,gif,image2,image2pipe,matrosk' --enable-network --enable-protocols --enable-decoder=h264


  



  Any ideas what I'm doing wrong and how I can make this error go away ?

  


• Compiling FFmpeg staticly using NDK error - Not position independent executables executable

  27 février 2017, par David Barishev

  I have been trying to compile ffmpeg into a static library in order to use it in my android application, but i couldn’t get it to work.

  Im working with FFmpeg 3.2.4, and ndk r13b, using bash on windows 10(Ubuntu 14.04).

  Here is what i did :

  • I made a stand alone toolchain for x86_64 and api 21 using :
    python make_standalone_toolchain.py --api 21 --arch x86_64 --install-dir {}

  • Made a configuration script :

    ./configure \
    
    --target-os=android                                     \
    
    --arch=x86_64                                              \
    
    --prefix=/home/david/ffmpeg_x86_64_build                          \
    
    --cross-prefix=/home/david/x86_64_toolchain/bin/x86_64-linux-android-\
    
    --sysroot=/home/david/x86_64_toolchain/sysroot                    \
    
    --enable-cross-compile                                  \
    
    --pkg-config-flags="--static"                           \
    
    --enable-ffmpeg                                         \
    
    --disable-ffplay                                        \
    
    --disable-ffprobe                                       \
    
    --disable-ffserver                                      \
    
    --disable-doc                                           \
    
    --disable-htmlpages                                     \
    
    --disable-manpages                                      \
    
    --disable-podpages                                      \
    
    --disable-txtpages                                      \
    
    --extra-cflags="-fPIC"                                  \
    
    --extra-cxxflags="-fPIC"
    
    --disable-shared --enable-static \
    
    --enable-yasm
    
    
    
    make
    
    make install

  It produced an FFmpeg executable, however when i ran it on my API 23 emulator, i got an error message :error: only position independent executables (PIE) are supported.
  Even that i used -fPic

  How can i fix it ? Also i’m not sure about my configuration, there wasn’t up to date sources on how to compile it correctly for every ABI (arm,arm64,x86,x86_64,mips,mips64) that i need for my application.
  I have seen many script, and im not too familiar with compiling native code, so i wasn’t sure what settings i need, for example like C flags and etc.

  To be precise on how i tried to configure FFmpeg :

  • I need a static library
  • I Only need the ffmpeg command line utility
  • I want to compile the library for every ABI i listed above.This configuration tried to compile for x86_64.
  • Running on android of course

  I would greatly appreciate some help on how to configure and compile this correctly.