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• FFmpeg -bash: ffmpeg: command not found

  12 February 2015, by Daniel Khajehpour

  OK, so I have gone up and down the internet trying to figure out what it is I am doing wrong ... and yet I’m in the middle of nowhere.
  I am basically trying to install the FFmpeg on my CENTOS 6.6 dedicated server by following the instructions here: https://trac.ffmpeg.org/wiki/CompilationGuide/Centos

  Everything seems to go just fine throughout the process. When it’s all done, I type in "ffmpeg" hit the enter and keep on getting this extremely ugly error:

  -bash: -bash:: command not found

  I’m not much of a shell guy, but working with it all day today, I can say that this means that it’s not installed correctly. So, I tried re-installing it, and it tells me all the packages already exist now ... . Here is a copy if what I am doing and what I am getting:

  root@server1 [~]# ffmpeg -version
  
  -bash: ffmpeg: command not found
  
  
  
  root@server1 [~]# yum install autoconf automake gcc gcc-c++ git libtool make nasm pkgconfig zlib-devel
  
  Loaded plugins: fastestmirror, priorities, security
  
  Setting up Install Process
  
  Loading mirror speeds from cached hostfile
  
   * base: centos.mirror.ndchost.com
  
   * extras: centos-distro.cavecreek.net
  
   * updates: mirrors.easynews.com
  
  Package autoconf-2.63-5.1.el6.noarch already installed and latest version
  
  Package automake-1.11.1-4.el6.noarch already installed and latest version
  
  Package gcc-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package gcc-c++-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package git-1.7.1-3.el6_4.1.x86_64 already installed and latest version
  
  Package libtool-2.2.6-15.5.el6.x86_64 already installed and latest version
  
  Package 1:make-3.81-20.el6.x86_64 already installed and latest version
  
  Package nasm-2.07-7.el6.x86_64 already installed and latest version
  
  Package 1:pkgconfig-0.23-9.1.el6.x86_64 already installed and latest version
  
  Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version
  
  Nothing to do

  Any ideas or help is greatly appreciated!

• How to copy data streams with ffmpeg?

  27 December 2020, by Gabor Posz

  I'm trying to direct stream copy video files with ffmpeg. (Remark: I'm using ffmpeg from C# via FFmpeg.AutoGen library, but it's irrelevant from the problem.)

  


  Here are some simplified code (e.g. error handling is elided):

  


  // Open input file:
fixed (AVFormatContext** formatContextPtrPtr = &inputFormatContextPtr)
{
    ffmpeg.avformat_open_input(formatContextPtrPtr, inputFileName, null, null);
}
ffmpeg.avformat_find_stream_info(this.inputFormatContextPtr, null);

// Open output file
AVIOContext* outputIOContextPtr;
ffmpeg.avio_open(&outputIOContextPtr, outputFileName, ffmpeg.AVIO_FLAG_WRITE);

// Create output context
AVFormatContext* outputFormatContextPtr;
ffmpeg.avformat_alloc_output_context2(&outputFormatContextPtr, null, null, outputFileName);
outputFormatContextPtr->pb = outputIOContextPtr;

// Create the same streams in the output context as in the input context
AVStream** streamsPointer = formatContext.streams;
for (int i = 0; i < streams.Length; i++)
{
    AVStream inputStream = **streamsPointer;
    
    AVStream* newStream = ffmpeg.avformat_new_stream(outputFormatContextPtr, null);
    ffmpeg.avcodec_parameters_copy(newStream->codecpar, inputStream.codecpar);

    streamsPointer++;
}

// Write header
ffmpeg.avformat_write_header(outputFormatContextPtr, null);

// Copy all streams packet by packet
do
{
    AVPacket* packetPtr = ffmpeg.av_packet_alloc();
    ffmpeg.av_read_frame(inputFormatContextPtr, packetPtr);

    ffmpeg.av_write_frame(outputFormatContextPtr, packetPtr);
    
    ffmpeg.av_packet_unref(packetPtr);
    ffmpeg.av_free(packetPtr);
}

// Close input and output files and contexts
ffmpeg.av_write_trailer(outputFormatContextPtr);
ffmpeg.avformat_free_context(outputFormatContextPtr);
ffmpeg.avio_close(outputIOContextPtr);

fixed (AVFormatContext** formatContextPtrPtr = &inputFormatContextPtr)
{
    ffmpeg.avformat_close_input(formatContextPtrPtr);
}



  


  It works as long as the streams are video or audio streams (AVMEDIA_TYPE_VIDEO or AVMEDIA_TYPE_AUDIO), but I get errors from avformat_write_header or av_write_frame if the stream is a data stream (AVMEDIA_TYPE_DATA).

  


  For example GoPro video (.mp4) files have data streams (besides the video and audio streams) with GPS and other sensor data:

  


  Stream #0 Type: AVMEDIA_TYPE_VIDEO Codec: AV_CODEC_ID_H264 Frame rate: 29,97 fps Duration: 00:00:03.7037000 Frame number: 111
Stream #1 Type: AVMEDIA_TYPE_AUDIO Codec: AV_CODEC_ID_AAC Frame rate: NaN fps Duration: 00:00:03.7120000 Frame number: 174
Stream #2 Type: AVMEDIA_TYPE_DATA Codec: AV_CODEC_ID_NONE Frame rate: 29,00 fps Duration: 00:00:03.7037000 Frame number: 1
Stream #3 Type: AVMEDIA_TYPE_DATA Codec: AV_CODEC_ID_BIN_DATA Frame rate: NaN fps Duration: 00:00:03.7120000 Frame number: 3
Stream #4 Type: AVMEDIA_TYPE_DATA Codec: AV_CODEC_ID_NONE Frame rate: NaN fps Duration: 00:00:03.7037000 Frame number: 290


  


  For stream #2 and #4 I get 0xffffffea "Invalid argument" error code from avformat_write_header and the following text is displayed on the console output: "Could not find tag for codec none in stream #2, codec not currently supported in container"

  


  For stream #3 I get the same error code from av_write_frame and the following text is displayed on the console output: "Invalid packet stream index: 3"

  


  Any idea how to copy these data streams as well?

  


• efficiently compressing an AVI video for PowerPoint

  3 July 2020, by brownfox

   I have a few AVI videos of very high bit-rate ( 6.0 Second video is 72 MB in size ). I want to put these videos in a Microsoft PowerPoint presentation, and since there are a few 10 such videos the size of the presentation file is getting too high. 


  


  I want to compress these videos to have a reasonable size. I used ffmpeg to compress these videos. I used the command
ffmpeg -i input.avi -vcodec msmpeg4v2 output.avi
and it gave me a compressed video of size 9.0 MB. But these new videos are not playing smoothly in Powerpoint (they are playing in other media players though).

  


  it is playing with hiccups. I assume I compressed the video with wrong parameter/encoding making it difficult to play.

  


  Can anyone suggest me the optimum parameter/arguments to use with FFmpeg in compressing these videos? The output of ffmpeg -i input.avi is given here.

  


  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 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 @ 0x23154c0] Changeing bps to 8
Input #0, avi, from '11_stte_frst_mode.avi':
  Metadata:
    encoder         : Lavf56.40.101
  Duration: 00:00:05.02, start: 0.000000, bitrate: 120249 kb/s
    Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 3200x2464, 120629 kb/s, 60 fps, 60 tbr, 60 tbn, 60 tbc





  


  I'm using Ubuntu 16.0, I have also a Windows machine. But it will be easier if I can fix in Ubuntu.

  


  The details of the output file is this,

  


  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 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
Input #0, avi, from '../11_stte_frst.avi':
  Metadata:
    encoder         : Lavf56.40.101
  Duration: 00:00:05.02, start: 0.000000, bitrate: 14859 kb/s
    Stream #0:0: Video: msmpeg4v2 (MP42 / 0x3234504D), yuv420p, 3200x2464, 14887 kb/s, 60 fps, 60 tbr, 60 tbn, 60 tbc