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  • Pipe opencv frames to ffmpeg

    17 juillet 2016, par baci

    I am trying to pipe opencv frames to ffmpeg using rawvideo format, which should accept the input as BGRBGRBGR... encoding the frame before piping is not an option.

    cv::Mat frame;
cv::VideoCapture cap("cap.avi");

while(1)
{
    cap >> frame;
    if(!frame.data) break;

    // some processing

    cv::Mat array = frame.reshape(0, 1); // to make continuous
    std::string output((char*) array.data, array.total() * array.elemSize());
    std::cout << output;
}

    with command

    cap.exe | ffplay -f rawvideo -pixel_format bgr24 -video_size 1920x1080 -framerate 10 -i -

    gives this kind of distorted result

    I think problem is not related to ffmpeg/ffplay, but something is wrong with my frame to raw conversion

    how to convert mat with 3 channels to rawvideo bgr24 format ?

  • With ffmpeg, trying to change a container from Mpeg TS to MP4, fps became twice of Mpeg TS

    17 juillet 2016, par user2148481

    I got a Mpeg TS file from a capture board to make a DEMO video clip.

    Here is information of the file from ffmpeg;

    Stream #0:0[0x51]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x61]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 224 kb/s

    However, I cannot edit it in FCP X, so I tried to change just its container TS to MP4 with ffmpeg using the below command.

    ffmpeg -i input.ts -vcodec copy -acodec copy output.mp4

    After doing it, fps of output.mp4 became 59.94 fps and information is like below;

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1750 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc
Stream #0:1(und): Audio: mp2 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 224 kb/s

    Fps is not same.

    Is there a way to keep same fps as TS with just copy option to change a container?

    I am wondering whether just re-encoding is solution or not.

    /////

    Full logs;

    $ ffmpeg -i input.ts -vcodec copy -acodec copy output.mp4
ffmpeg version 1.1.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Feb  6 2013 10:45:57 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 86.100 / 54. 86.100
  libavformat    54. 59.106 / 54. 59.106
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.100 /  3. 32.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpegts @ 0x7f8a2b033000] max_analyze_duration 5000000 reached at 5003333
Input #0, mpegts, from 'input.ts':
  Duration: 00:05:01.27, start: 0.224400, bitrate: 2727 kb/s
  Program 1 
    Stream #0:0[0x51]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x61]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 224 kb/s
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf54.59.106
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 90k tbn, 90k tbc
    Stream #0:1: Audio: mp2 (i[0][0][0] / 0x0069), 48000 Hz, stereo, 224 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0x7f8a2b058200] pts has no value
frame=13472 fps=0.0 q=-1.0 size=   54536kB time=00:03:44.80 bitrate=1987.3kbits/frame=18056 fps=0.0 q=-1.0 Lsize=   73024kB time=00:05:01.28 bitrate=1985.5kbits/s    
video:64370kB audio:8212kB subtitle:0 global headers:0kB muxing overhead 0.608498%

  • Why does mplayer not play my stream ?

    17 juillet 2016, par SirWindfield

    I wanted to use mplayer (a command line tool) to play a SoundCloud url that I fetched with there official API. The url looks like this

    https://cf-media.sndcdn.com/qop35iYKlHhs.128.mp3?Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiKjovL2NmLW1lZGlhLnNuZGNkbi5jb20vcW9wMzVpWUtsSGhzLjEyOC5tcDMiLCJDb25kaXRpb24iOnsiRGF0ZUxlc3NUaGFuIjp7IkFXUzpFcG9jaFRpbWUiOjE0Njg3NTM4NjB9fX1dfQ__&Signature=OZ4IawmjdU6hEN8KB8e~t3QTy4lBFVBbIDg-a6tuPkb65e0mPskkCFFASkTWbyy5lsaT9IrURan6y70sZhLXPbng1IfkTsGdX1dO938NwVYnKs-BS7IL4TiVFxTBXoKJgmCmUD0qmmGmYqm3YdGZQrP~Sj~mw9~fmtwdHQu0rhl3O-dKsgk497JAR6pMorQs7BSs0XIosV1Mmv2DMD6iifquCWV9Ezq4ekneQ1gfSjVmzjjnKvsxjPpgmU~5DTdewwzlNClVxdzHSQONWM7c0YMGlBcVz97NviaeZOQSCAW8QZS59WULXJBJ9OmEPctWtpe3O0mo-GYjwEkbVGYl9A__&Key-Pair-Id=APKAJAGZ7VMH2PFPW6UQ

    I use the command "mplayer 'url'" to play it but I always get the output:

    libavformat version 57.25.100 (internal)
https protocol not found, recompile FFmpeg with openssl, gnutls,
or securetransport enabled.

    Looking which protocols have been installed tells me that I have https input and output support (ffmpeg -protocols):

    ffmpeg version 3.1.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 7.3.0 (clang-703.0.31)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.1.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libfaac --enable-ffplay --enable-libspeex --enable-openssl --enable-libopus --disable-lzma --enable-nonfree --enable-vda
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 48.101 / 57. 48.101
  libavformat    57. 41.100 / 57. 41.100
  libavdevice    57.  0.101 / 57.  0.101
  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
Supported file protocols:
Input:
  async
  cache
  concat
  crypto
  data
  file
  ftp
  gopher
  hls
  http
  httpproxy
  https
  mmsh
  mmst
  pipe
  rtp
  srtp
  subfile
  tcp
  tls
  udp
  udplite
  unix
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
Output:
  crypto
  file
  ftp
  gopher
  http
  httpproxy
  https
  icecast
  md5
  pipe
  rtp
  srtp
  tcp
  tls
  udp
  udplite
  unix
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte

  • How to add album art with ffmpeg ?

    17 juillet 2016, par Adi Ricky k

    Everybody, I've stuck to add album art on mp3 files.

    I already research and Googling about this issue but not solution yet, on ffmpeg documentation to add image (album art) to mp3 use this script:

    ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3

    Source from: http://www.ffmpeg.org/ffmpeg-all.html#mp3

    But it's doesn't work on my console output is: 

    Unrecognized option 'c'
Failed to set value 'copy' for option 'c'

    I looking for another solution and I get from: http://trac.ffmpeg.org/ticket/2221:

    ffmpeg -i input.mp3 -i cover.png -map 0:0 -map 1:0 -c copy -id3v2_version 3 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3

    Also return same output, I already research why return : 

    Unrecognized option 'c'
Failed to set value 'copy' for option 'c'

    But there are no body have same problem. anybody can help me, please?

    nb: I use ubuntu 12.04 and ffmpeg version 0.8.6-4:0.8.6-0. thanks

  • Changing resolution mid-video with FFMPEG

    16 juillet 2016, par kingrolo

    I have a source video (mpeg2video) which I'm transcoding to x264. The source contains 2 different programs recorded from TV. One is in 4:3 AR and the other 16:9 AR. When I play the source file through VLC the player correctly changes size to show the video at the correct AR. So far so good.

    When I transcode the conversion process auto detects the AR from the first few frames and then transcodes the whole video using this AR. If the 16:9 section comes first then the whole conversion is done in 16:9 and the 4:3 section looks stretch horizontally. If the 4:3 section is at the start of the source file then the whole transcode is done in 4:3 and the 16:9 section looks squashed horizontally.

    No black bars are ever visible.

    Here's my command:

    nice -n 17 ffmpeg -i source.mpg -acodec libfaac -ar 48000 -ab 192k -async 1 -copyts -vcodec libx264 -b 1250k -threads 2 -level 31 -map 0:0 -map 0:1 -map 0:2 -scodec copy -deinterlace output.mkv

    I don't fully understand what's going on. How do I get the same 'change in AR' mid video in the output file that I have in the input video?

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