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  • How to crop bottom of video followed by removing black borders ?

    9 mai 2018, par pmdaly

    I have video where there is a static bar on the bottom 50 pixels and also a black boarder around the actual content. I want to remove the bottom 50 pixels then use cropdetect to auto trim the border.

    I have the following to remove the border

    dims = $(ffmpeg -i "$video$ -t 1 -vf cropdetect -f null - 2>&1 | awk '/crop/{print $NF}' | tail -n1)

ffmpeg -i "$video" -vf "$dims" "$video_out"

    I'm not sure how to add the step to remove the bottom 50 pixels prior to this.

  • FFMPEG : Remove packets based on PTS/DTS

    9 mai 2018, par stevendesu

    I have a video which contains some audio packets beyond the end of the video data:

    $> ffprobe -show_packets video.mp4
...
...
...
[PACKET]
codec_type=video
stream_index=0
pts=5653648
pts_time=235.568667
dts=5653648
dts_time=235.568667
duration=1001
duration_time=0.041708
convergence_duration=N/A
convergence_duration_time=N/A
size=1030
pos=25233684
flags=__
[/PACKET]
[PACKET]
codec_type=audio
stream_index=1
pts=11310080
pts_time=235.626667
dts=11310080
dts_time=235.626667
duration=1024
duration_time=0.021333
convergence_duration=N/A
convergence_duration_time=N/A
size=284
pos=25234714
flags=K_
[/PACKET]
[PACKET]
codec_type=audio
stream_index=1
pts=11311104
pts_time=235.648000
dts=11311104
dts_time=235.648000
duration=1024
duration_time=0.021333
convergence_duration=N/A
convergence_duration_time=N/A
size=285
pos=25234998
flags=K_
[/PACKET]
[PACKET]
codec_type=audio
stream_index=1
pts=11312128
pts_time=235.669333
dts=11312128
dts_time=235.669333
duration=992
duration_time=0.020667
convergence_duration=N/A
convergence_duration_time=N/A
size=290
pos=25235283
flags=K_
[/PACKET]
$>

    The last video packet in the video has a PTS time of 235.568667 and a duration of 0.041708 - meaning all video data ends at 235.610375. However there are audio packets beginning at 235.626667 and later.

    Is there an easy way to strip these audio packets from the file so that the audio and video end simultaneously?

  • Twitter gives error on ffmpeg generated video “The media you tried to upload was invalid.”

    9 mai 2018, par TrooPHP Developer

    ffmpeg generated video gives error while sharing on twitter. the error is :

    “Cannot read property ‘code’ of undefined”

    I am generating video from audio. my sample code Example is:

    ffmpeg -i audio.webm -i image.png -vcodec libx264 -pix_fmt yuv420p -strict -2 -acodec aac video.mp4

    I am directly trying to upload generated video to twitter website and video size is just 6 seconds.

  • How can I record an audio from USB audio device using C++ with ffmpeg on Linux ?

    9 mai 2018, par Hunter Haimin Zhang

    How can I record an audio from USB audio device using C++ with ffmpeg on Linux? I have the following code. But I have no idea how to set the parameter of 'url' in the function of avformat_open_input. Could assistance be provided by anybody? Much appreciated.

       27     av_register_all();
   28     avdevice_register_all();
   29
   30     //pAudioInputFmt =av_find_input_format("dshow");
   31     pAudioInputFmt =av_find_input_format("alsa");
   32     //assert(pAudioInputFmt != NULL);
   33     if (!(pAudioInputFmt != NULL))
   34     {
   35         printf("Error %s %d\n", __FILE__, __LINE__);
   36         char ch = cin.get();
   37         cout << "ch = "<< ch << endl;
   38         return (-1);
   39     }
   40
   41     // I have no idear how to set the second parameter on Linux.
   42     if (!(avformat_open_input(&pFmtCtx, "=Device)", pAudioInputFmt,NULL) == 0))
   43     {
   44         printf("Error %s %d\n", __FILE__, __LINE__);
   45         system("pause");
   46         return (-1);
   47     }

  • Concatenate audio with image and video using ffmpeg

    9 mai 2018, par huynq9

    I have 1 image, 1 audio file and 1 video. I would like to merge all of them to make a video which will

    • show the image and play audio file for the first 10s
    • play the video file

    here is what I was trying to do so far.

    ffmpeg \
-loop 1 -framerate 24 -t 10 -i item1.jpg \
-i "https://audio-ssl.itunes.apple.com/apple-assets-us-std-000001/Music/66/58/f7/mzi.eoocfriy.aac.p.m4a" \
-i item4.mp4 \
-filter_complex \
"[0]scale=432:432,setdar=1[img1]; \
 [1]volume=1[aud1]; \
 [2]scale=432:432,setdar=1[vid1]; \ 
 [img1][aud1][vid1] concat=n=3:v=1:a=1" \
outputfile.mp4

    I got the error:

    [Parsed_setdar_4 @ 0x3063780] Media type mismatch between the 'Parsed_setdar_4' filter output pad 0 (video) and the 'Parsed_concat_6' filter input pad 1 (audio) [AVFilterGraph @ 0x30479a0] Cannot create the link setdar:0 -> concat:1 Error initializing complex filters. Invalid argument

    I tried to googled but still cannot figure out what I am doing wrong?

    Updated: I ran the following command:

    ffmpeg \
-loop 1 -framerate 24 -t 10 -i item1.jpg \
-t 10 -i "https://audio-ssl.itunes.apple.com/apple-assets-us-std-000001/Music/66/58/f7/mzi.eoocfriy.aac.p.m4a" \
-i item4.mp4 \
-f lavfi -t 1 -i anullsrc \
-filter_complex \
"[0]scale=432:432,setsar=1[img1]; \
[2]scale=432:432,setsar=1[vid1]; \ 
[img1][1][vid1][3] concat=n=2:v=1:a=1" \
outputfile.mp4

    and got the following error:

    ffmpeg version 3.3.3 Copyright (c) 2000-2017 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 --disable-ffserver --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc --enable-libzimg
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, image2, from 'item1.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 8365 kb/s
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 432x432 [SAR 1:1 DAR 1:1], 24 fps, 24 tbr, 24 tbn, 24 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'https://audio-ssl.itunes.apple.com/apple-assets-us-std-000001/Music/66/58/f7/mzi.eoocfriy.aac.p.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 0
    compatible_brands: M4A mp42isom
    creation_time   : 1983-06-16T23:20:44.000000Z
    iTunSMPB        :  00000000 00000840 00000000 00000000001423C0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  Duration: 00:00:29.98, start: 0.047891, bitrate: 285 kb/s
    Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 271 kb/s (default)
    Metadata:
      creation_time   : 1983-06-16T23:20:44.000000Z
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'item4.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 1970-01-01T00:00:00.000000Z
    encoder         : Lavf53.24.2
  Duration: 00:00:13.70, start: 0.000000, bitrate: 615 kb/s
    Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 229 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : VideoHandler
    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 382 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : SoundHandler
Input #3, lavfi, from 'anullsrc':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #3:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
[AVFilterGraph @ 0x3955e20] No such filter: ' '
Error initializing complex filters.
Invalid argument

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