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  • FFmpeg formats list with alpha support

    15 décembre 2017, par user1722669

    I am looking the list of FFmpeg codecs which support the alpha channel. seems that there is no description of codec list with alpha in FFmpeg.

    I am interested only in decoding files with alpha, not for encoding one. Thank you.

  • How to convert audio files from mp4 to mp3 using applescript ?

    15 décembre 2017, par MBUST

    Can someone please help me understand how to convert audio files from mp4 to mp3 using AppleScript?

    I have tried scripting VLC or Sound Studio but the commands don't seem to come close to doing that. I downloaded and installed ffmpeg but I don't know the syntax to use.

    I tried something like this with ffmpeg:

     tell application "Finder"
set CurrentPath to container of (path to me) as alias
set OriginalFile to CurrentPath & "ASProcessing:SoundToProcess.mp4" as string
set NewFile to CurrentPath & "ASProcessing:NewFile.mp3" as string

end tell


 set outputFile to POSIX path of OriginalFile
 set inputFile to POSIX path of NewFile
 do shell script ffmpeg something, something

    But clearly I'm missing most of the script syntax. Eventually, I would do a repeat loop to go through a set of files.

    Sorry that I can't be more specific. I'm pretty lost with this. What I do know is that I do not want to use Automator. I need something like AppleScript.

    Thanks.

    mbust

  • ffmpeg filters image processing

    15 décembre 2017, par Ja_cpp

    ffmpeg is applying some filters to the images before constructing the video. Is there any way to know those filters?

    I'm using this command (so every parameters are kept by default):

    ffmpeg -framerate 12 -i frame%02d.jpg out.mp4

    Example of one frame:

    Image file:

    enter image description here

    From the video: enter image description here

    I'm working on image processing with c++ and I'm interested in the way ffmpeg filtering the images

    EDIT

    When I launch the command line, that what I get in the terminal:

    ffmpeg -framerate 5 -i frame%02d.jpg output.mp4


ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
[mjpeg @ 0x23e8600] Changeing bps to 8
Input #0, image2, from 'frame%02d.jpg':
  Duration: 00:01:40.20, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 2576x1456 [SAR 1:1 DAR 23:13], 5 fps, 5 tbr, 5 tbn, 5 tbc
No pixel format specified, yuvj420p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x23ec680] using SAR=1/1
[libx264 @ 0x23ec680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x23ec680] profile High, level 5.0
[libx264 @ 0x23ec680] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf56.40.101
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc), 2576x1456 [SAR 1:1 DAR 23:13], q=-1--1, 5 fps, 10240 tbn, 5 tbc
    Metadata:
      encoder         : Lavc56.60.100 libx264
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame=  501 fps=3.8 q=-1.0 Lsize=  154288kB time=00:01:39.80 bitrate=12664.6kbits/s    
video:154284kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002771%
[libx264 @ 0x23ec680] frame I:3     Avg QP:17.31  size:564506
[libx264 @ 0x23ec680] frame P:498   Avg QP:19.27  size:313841
[libx264 @ 0x23ec680] mb I  I16..4:  0.2% 97.1%  2.7%
[libx264 @ 0x23ec680] mb P  I16..4:  0.0% 46.3%  0.5%  P16..4: 12.5% 13.0%  7.7%  0.0%  0.0%    skip:20.1%
[libx264 @ 0x23ec680] 8x8 transform intra:98.9% inter:73.3%
[libx264 @ 0x23ec680] coded y,uvDC,uvAC intra: 99.0% 99.7% 96.0% inter: 52.0% 57.7% 37.0%
[libx264 @ 0x23ec680] i16 v,h,dc,p: 17% 16% 13% 54%
[libx264 @ 0x23ec680] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 12% 33%  6%  7%  6%  8%  7% 10%
[libx264 @ 0x23ec680] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 13% 14% 10% 13%  9% 11%  8% 10%
[libx264 @ 0x23ec680] i8c dc,h,v,p: 66% 14% 14%  5%
[libx264 @ 0x23ec680] Weighted P-Frames: Y:2.0% UV:1.2%
[libx264 @ 0x23ec680] ref P L0: 45.6% 16.0% 20.4% 17.6%  0.5%
[libx264 @ 0x23ec680] kb/s:12613.66

  • FFMPEG udp input stream and input stream play local file

    15 décembre 2017, par liewjls

    Hoping someone can guide me to the right place. I have a application is being the "middle man" receiving a video stream from a source via UDP and passing this video stream to a ffmpeg instance on a server and record a certain period of the video (without audio), on a certain occasion it will need to play the video from recorded video instead of passing the live video stream to the ffmepg instance on the server. 

    /ffmpeg -an -f mpegts -i udp://@:7100/?fifo_size=2000&overrun_nonfatal=1 -analyzeduration 150 -f rawvideo -map 0:0 -vcodec rawvideo -pix_fmt bgra - -af volumedetect -vn -sn -dn -map 0:1 -f mpegts -y -flush_packets 0 udp://127.0.0.1:7208?pkt_size=1316

    I managed to record the video without audio frm Extracting the h264 part of a video file (demuxing)

    The difference is i save the recorded file as "mpegts"

    avformat_alloc_output_context2(&ofmt_ctx_a, NULL,  "mpegts", out_filename_a);

    As soon i need to play from this recorded file, i read every 1316 packets from this file and pass it to the ffmpeg via the localhost port.

    The problem is the ffmpeg seems doesn't like my recorded file and i noticed it has error msg "DTS 18635855 < 24133055 out of order"

    How do i resolve this issue?

    Thanks.

  • Overlap segments of videos in FFmpeg [duplicate]

    15 décembre 2017, par Spandan Thakur

    This question already has an answer here:

    I am able to segment a video using the below command.

    ffmpeg -i Sample.mp4 -c copy -map 0 -segment_list sample.csv -segment_time 10 -f segment -reset_timestamps 1 output%03d.mp4

    This command segments the videos in approximately 10 second splits without any overlap.

    Is there anyway though to have an overlap between the split videos? Ideally, I want a 10 seconds overlap between each output video.

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