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• swresample/arm : remove unintentional relocation.

  19 avril 2018, par Rahul Chaudhry

  swresample/arm : remove unintentional relocation.
  Branch to global symbol results in reference to PLT, and when compiling
  
  for THUMB-2 - in a R_ARM_THM_JUMP19 relocation. Some linkers don't
  
  support this relocation (ld.gold), while others can end up truncating
  
  the relocation to fit (ld.bfd).
  Convert this branch through PLT into a direct branch that the assembler
  
  can resolve locally.
  See https://github.com/android-ndk/ndk/issues/337 for background.
  The current workaround is to disable neon during gstreamer build,
  
  which is not optimal and can be reverted after this patch :
  
  https://github.com/freedesktop/gstreamer-cerbero/commit/41556c415739fbc3a72c7eaee7e70a565b719b2f
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libswresample/arm/audio_convert_neon.S

• FFmpeg create directory hierarchy for strftime

  23 avril 2017, par David

  Recently bought an ip-cam which outputs a RTSP stream. I’m using the segment option of FFmpeg to create 30 minute long recordings.

  I want FFmpeg to write the files to a directory based on Year/Month/Date, and write to a file Hour-Minute.mp4 For example :
  /raid1/homes/share/public/recordings/queue/bedroom/2017/04/23/13-05.mp4 for a recording started on 23 april 2017, 13:05.

  Unfortunately FFmpeg seems to not create the directory hierarchy. FFmpeg quits since the directory can not be found.

  Input #0, rtsp, from 'rtsp://192.168.1.240/unicast':
  
    Metadata:
  
      title           : LIVE555 Streaming Media v2014.07.04
  
      comment         : LIVE555 Streaming Media v2014.07.04
  
    Duration: N/A, start: 0.000750, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p, 1920x1080, 90k tbr, 90k tbn, 180k tbc
  
      Stream #0:1: Audio: pcm_alaw, 8000 Hz, 1 channels, s16, 64 kb/s
  
  [segment @ 0x2557300] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  [segment @ 0x2557300] Failed to open segment '/raid1/homes/share/public/recordings/queue/bedroom/2017/04/23/14-19.mp4'
  
  Output #0, segment, to '/raid1/homes/share/public/recordings/queue/bedroom/%Y/%m/%d/%H-%M.mp4':
  
    Metadata:
  
      title           : LIVE555 Streaming Media v2014.07.04
  
      comment         : LIVE555 Streaming Media v2014.07.04
  
      encoder         : Lavf57.41.100
  
      Stream #0:0: Video: h264, yuv420p, 1920x1080, q=2-31, 90k tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory

  record.sh is as follows :

  #!/bin/sh
  
  ffmpeg -stimeout 600\
  
   -rtsp_transport udp \
  
   -i rtsp://192.168.1.240/unicast \
  
   -c copy \
  
   -map 0:0 \
  
   -f segment \
  
   -segment_time 3600 \
  
   -segment_wrap 100 \
  
   -segment_format mov \
  
   -strftime 1 \
  
   -reset_timestamps 1 \
  
   "/raid1/homes/share/public/recordings/queue/bedroom/%Y/%m/%d/%H-%M.mp4"

  I’ve tried not using a directory hierachy : "/raid1/homes/share/public/recordings/queue/bedroom/%Y-%m-%d_%H-%M.mp4". This works fine.

  $ ffmpeg -version
  
  ffmpeg version N-80901-gfebc862 Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  
  libavutil      55. 28.100 / 55. 28.100
  
  libavcodec     57. 48.101 / 57. 48.101
  
  libavformat    57. 41.100 / 57. 41.100
  
  libavdevice    57.  0.102 / 57.  0.102
  
  libavfilter     6. 47.100 /  6. 47.100
  
  libavresample   3.  0.  0 /  3.  0.  0
  
  libswscale      4.  1.100 /  4.  1.100
  
  libswresample   2.  1.100 /  2.  1.100
  
  libpostproc    54.  0.100 / 54.  0.100

  Can FFmpeg create output directories on the go ?

• Patching FFmpeg to extract more detailed MV information

  13 février 2018, par helmo

  I am new to video compression and in the past one month I have been studying and reading a lot on this topic. My main aim as of now is to be able to extract in a meaningful way, motion vectors data into a text file.

  Some may write about ffmpeg’s extract_mvs.c but I have already explored this example file and is not returning the complete information I would like to get, for instance, the output of this file does not tell the frame type nor whether a backward or forward motion vector was used for a particular frame number.

  I saw here on SO a similar post that had as answers to explore ’patch’ of FFMpeg to get more meaningful information, that’s a reply from Ronald.

  Is there anyone in the community who can help in expanding this file and get more out of ffmpeg ? Does anyone know about this patch and what it means/entails ?

  Thanks in advance.