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  • How to change wave file frequency while retaining sample rate [duplicate]

    28 janvier 2019, par q1w2e3r4t5y6

    This question already has an answer here:

    I am wondering how to change a wave file's frequency while retaining its sample rate. I have tried:

    ffmpeg -i $1 -filter:a "asetrate=$2" -y $3

    The second argument here changes drastically, by the way. However, this changes the sample rate, making it impossible to concatenate with sox. How can I modify the above code so that it changes the frequency while still having the same sample rate?

  • Change wave file frequency while retaining sample rate bash

    28 janvier 2019, par q1w2e3r4t5y6

    I am wondering how to change a wave file's frequency while its retaining sample rate. I have tried:

    ffmpeg -i $1 -filter:a "asetrate=$2" -y $3

    The second argument here changes drastically, by the way. However, this changes the sample rate, making it impossible to concatenate with sox. How can I make the above code so that it changes the frequency while still having the same sample rate? Thanks!

  • ffmpeg, v4l, snd_aloop ... sound asyncron (alsa buffer xrun)

    28 janvier 2019, par Tobias

    I'm trying to create a stream that automatically reloads random inputs. I would like to extend this to a database later.

    Each time ffmpeg finishes and starts again, so the input changes, the connection to the rtmp is interrupted briefly causing the whole connection breaks down. I then tried to separate audio and video, to send them to virtual devices and read from there again. Split the stream on virtual devices, reassemble them directly and send them to rtmp. If the input is then exchanged, the sending to the devices interrupts what does not bother the second ffmpeg. As soon as I stop sending to the devices the fps go very slowly (10 - 20 sec) from 25 to 0. Only then does the transmitter ffmpeg break the connection to the rtmp. The script which exchanges the inputs needs only one second. A practical test showed that everything works as desired.

    I can quite comfortably change the input while the second ffmpeg maintains the stream ...

    The joy did not last long. The sound is good 1 sec delayed. But sporadically. Sometimes everything works great. Sometimes the sound is offset.

    I wrote several scripts for this.

    Background:

    1. File is selected by random
    2. Media file is split and written to / dev / video0 (v4l loopback) and alsa default (snd_aloop loopback)
    3. Put the splits together again and stream them to a rtmp server

    Code that selects the input and sends to / dev / video0 and alsa default

    #!/bin/bash

cat /dev/null > log

while true;
do

  WATERMARK="watermark.png";
  dir='/homeXXXXXXXXXX/mix'
  file=`/bin/ls -1 "$dir" | sort --random-sort | head -1`
  DATEI=`readlink --canonicalize "$dir/$file"` # Converts to full path

if [ -z $DATEI ]
then
  echo "Keine Datei gefunden" >> log;
else
  START=$(date +%s);
  echo "Sende $DATEI" >> log;
  ffmpeg -re -y -i "$DATEI" -c:v libx264 -vf "fps=25,scale=640:480,setdar=4:3" -async 1 -pix_fmt yuv420p -preset ultrafast -map 0:0 -f v4l2 -vcodec rawvideo /dev/video0 -f alsa default
fi

DOKILL=`cat kill`;
if [ "$DOKILL" = "1"]
then
  break;
fi

done

    The Output

    ./run.sh 
ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/mix/XXXXXXXXXXXXX.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : XXXXXXXXXXXXXXX 

    encoder         : Lavf57.41.100
  Duration: 00:03:53.48, start: 0.000000, bitrate: 2705 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2573 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Codec AVOption preset (Configuration preset) specified for output file #0 (/dev/video0) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
[Parsed_setdar_2 @ 0x5571234fe020] num:den syntax is deprecated, please use num/den or named options instead
-async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.
Output #0, v4l2, to '/dev/video0':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : XXXXXXXXXXX 

    encoder         : Lavf57.56.101
    Stream #0:0(und): Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc57.64.101 rawvideo
Output #1, alsa, to 'default':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : XXXXXXXXXX 

    encoder         : Lavf57.56.101
    Stream #1:0(und): Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc57.64.101 pcm_s16le
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  Stream #0:1 -> #1:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
frame=  736 fps= 24 q=-0.0 Lsize=N/A time=00:00:29.67 bitrate=N/A speed=0.979x    
video:331200kB audio:5112kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Exiting normally, received signal 2.

    The send script

    #!/bin/bash

IP="XXXXXXXXX";

ffmpeg -f video4linux2 -i /dev/video0 -f alsa -acodec pcm_s16le -i default -f flv -async 1 -pix_fmt yuv420p -preset ultrafast -vcodec libx264 -r 25 -s 640x260 -acodec aac rtmp://$IP:1935/live/test

    The Output

    ./send_stream.sh 
ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 1548393682.674066, bitrate: 110592 kb/s
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480, 110592 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1548393682.677901, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
-async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.
[libx264 @ 0x55e22cfa4f00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x55e22cfa4f00] profile Constrained Baseline, level 2.1
[libx264 @ 0x55e22cfa4f00] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, flv, to 'rtmp://XXXXXXXXXXX:1935/live/test':
  Metadata:
    encoder         : Lavf57.56.101
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 640x260, q=-1--1, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.64.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc57.64.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[alsa @ 0x55e22cf87300] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[video4linux2,v4l2 @ 0x55e22cf84fe0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
Past duration 0.613319 too large    7344kB time=00:01:05.85 bitrate= 913.5kbits/s speed=1.04x    
Past duration 0.614372 too large    7644kB time=00:01:08.39 bitrate= 915.6kbits/s speed=1.04x    
Past duration 0.609749 too large    7834kB time=00:01:10.91 bitrate= 905.0kbits/s speed=1.04x    
Past duration 0.604362 too large    8038kB time=00:01:12.92 bitrate= 903.0kbits/s speed=1.04x    
Past duration 0.609489 too large    8070kB time=00:01:13.45 bitrate= 900.1kbits/s speed=1.04x    
Past duration 0.615013 too large    8094kB time=00:01:13.94 bitrate= 896.8kbits/s speed=1.04x    
Past duration 0.610893 too large    8179kB time=00:01:14.94 bitrate= 894.0kbits/s speed=1.04x    
Past duration 0.664711 too large
Past duration 0.639565 too large    8263kB time=00:01:15.47 bitrate= 896.8kbits/s speed=1.04x    
Past duration 0.668999 too large    8339kB time=00:01:15.94 bitrate= 899.5kbits/s speed=1.04x    
Past duration 0.605766 too large
Past duration 0.633049 too large    8399kB time=00:01:16.48 bitrate= 899.6kbits/s speed=1.04x    
Past duration 0.674599 too large
Past duration 0.616035 too large    8451kB time=00:01:16.95 bitrate= 899.7kbits/s speed=1.04x    
Past duration 0.656136 too large
Past duration 0.604195 too large
Past duration 0.601387 too large    8512kB time=00:01:17.46 bitrate= 900.2kbits/s speed=1.04x    
Past duration 0.621895 too large    8565kB time=00:01:17.95 bitrate= 900.1kbits/s speed=1.04x    
Past duration 0.670937 too large    8605kB time=00:01:18.46 bitrate= 898.4kbits/s speed=1.04x    
Past duration 0.604500 too large    8642kB time=00:01:18.99 bitrate= 896.2kbits/s speed=1.04x    
frame= 1913 fps= 25 q=-1.0 Lsize=    8670kB time=00:01:19.48 bitrate= 893.6kbits/s speed=1.04x    
video:7290kB audio:1280kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.160292%
[libx264 @ 0x55e22cfa4f00] frame I:8     Avg QP:18.25  size: 15502
[libx264 @ 0x55e22cfa4f00] frame P:1905  Avg QP:20.95  size:  3853
[libx264 @ 0x55e22cfa4f00] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x55e22cfa4f00] mb P  I16..4:  6.4%  0.0%  0.0%  P16..4: 38.1%  0.0%  0.0%  0.0%  0.0%    skip:55.5%
[libx264 @ 0x55e22cfa4f00] coded y,uvDC,uvAC intra: 46.0% 30.3% 13.4% inter: 20.1% 9.8% 1.1%
[libx264 @ 0x55e22cfa4f00] i16 v,h,dc,p: 47% 34% 10%  9%
[libx264 @ 0x55e22cfa4f00] i8c dc,h,v,p: 45% 28% 22%  5%
[libx264 @ 0x55e22cfa4f00] kb/s:750.98
[aac @ 0x55e22cfa62a0] Qavg: 579.067
Exiting normally, received signal 2.

    First everything is fine and then comes

    Past duration 0.616035 too large    8451kB time=00:01:16.95 bitrate= 899.7kbits/s speed=1.04x    
Past duration 0.656136 too large
Past duration 0.604195 too large
Past duration 0.601387 too large    8512kB time=00:01:17.46 bitrate= 900.2kbits/s speed=1.04x

    And then when that comes, dives in the first window, so in the ffmpeg sends the input:

    Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  Stream #0:1 -> #1:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
frame=    9 fps=0.0 q=-0.0 size=N/A time=00:00:00.36 bitrate=N/A dup=1 drop=0 spframe=   21 fps= 21 q=-0.0 size=N/A time=00:00:00.84 bitrate=N/A dup=1 drop=0 sp[alsa @ 0x5643b3293160] ALSA buffer xrun.
    Last message repeated 1 times
frame=   33 fps= 22 q=-0.0 size=N/A time=00:00:01.32 bitrate=N/A dup=1 drop=0 sp[alsa @ 0x5643b3293160] ALSA buffer xrun.
    Last message repeated 1 times
frame=   46 fps= 23 q=-0.0 size=N/A time=00:00:01.84 bitrate=N/A dup=1 drop=0 spframe=   58 fps= 23 q=-0.0 size=N/A time=00:00:02.32 bitrate=N/A dup=1 drop=0 spframe=   71 fps= 24 q=-0.0 size=N/A time=00:00:02.84 bitrate=N/A dup=1 drop=0 spframe=   83 fps= 24 q=-0.0 size=N/A time=00:00:03.32 bitrate=N/A dup=1 drop=0 sp[alsa @ 0x5643b3293160] ALSA buffer xrun.
frame=   96 fps= 24 q=-0.0 size=N/A time=00:00:03.84 bitrate=N/A dup=1 drop=0 sp[alsa @ 0x5643b3293160] ALSA buffer xrun.

    The sound is then absolutely unsynchronized ...

    Does anyone have any advice and can help me?

  • FFmpeg doesn't use GPU

    28 janvier 2019, par hamidi

    I got the latest version binaries of ffmpeg from here. When I examine CPU and GPU usages when I play a video by its ffplay, I see that GPU is used during play. Not much using of CPU also indicates it. But when I get the latest version sources from the original site, I can't use GPU. To clarify, I include a player test program I wrote until now. When I uncomment the line which includes avcodec_find_decoder_by_name("h264_cuvid"), I get error -1. The error happens in avcodec_open2 with the description of Operation not permitted.

    CString format(const char *fmt, ...) 
{ 
    va_list ap;
    va_start(ap, fmt);
    char buf[512];
    vsnprintf(buf, sizeof(buf), fmt, ap);
    va_end(ap);
    return buf;
}

int CplayerDlg::play()
{
    FILE *fp = fopen("video_files/1010.brf", "rb");
    if (!fp)
    {
        AfxMessageBox("can't open video file");
        return -1;
    }
    RecordFrame frame;
    RecordHeader hdr;
    fread(&frame, sizeof(frame), 1, fp);
    if (frame.frameType != FRAME_TYPE_HEADER)
    {
        AfxMessageBox("record file doesn't begin with header");
        return -1;
    }
    fread(&hdr, sizeof(hdr), 1, fp);
    GetDlgItem(IDC_DIM)->SetWindowText(format("%dx%d", hdr.width, hdr.height));
    GetDlgItem(IDC_CODEC_ID)->SetWindowText(format("%d", hdr.codecId));
    GetDlgItem(IDC_PIXEL_FORMAT)->SetWindowText(format("%d", hdr.pixelFormat));
    GetDlgItem(IDC_TIMEBASE)->SetWindowText(format("%d/%d", hdr.timebaseNum, hdr.timebaseDen));
    AVCodec *pCodec;

#if 0
#define CHECK(decoder)\
    pCodec = avcodec_find_decoder_by_name(#decoder);\
    AfxMessageBox(pCodec ? #decoder " found" : "can't find " #decoder);

    CHECK(h264_cuvid);

#undef CHECK
#endif

    pCodec = avcodec_find_decoder(AV_CODEC_ID_H264);
    //pCodec = avcodec_find_decoder_by_name("h264_cuvid");
    if (!pCodec)
    {
        AfxMessageBox("can't find h264 decoder");
        return -1;
    }

    AVCodecContext *pCodecContext = avcodec_alloc_context3(pCodec);
    if (!pCodecContext)
    {
        AfxMessageBox("can't allocate codec context");
        return -1;
    }

#if 0
// enumerating available codecs
    //av_register_all();
    avcodec_register_all();

    AVCodec *current_codec = av_codec_next(NULL);
    while (current_codec != NULL)
    {
        TRACE("%s\n", current_codec->name);
        current_codec = av_codec_next(current_codec);
    }
#endif

    int err = avcodec_open2(pCodecContext, pCodec, NULL);
    if (err != 0)
    {
        char buf[AV_ERROR_MAX_STRING_SIZE];
        av_make_error_string(buf, AV_ERROR_MAX_STRING_SIZE, err);
        char buf2[AV_ERROR_MAX_STRING_SIZE];
        sprintf(buf2, "%d (%x): %s\n", err, err, buf);
        AfxMessageBox(buf2);
        return -1;
    }
    AfxMessageBox("operation completed successfully");
    fclose(fp);
    return 0;
}

  • ffmpeg splitting rgba into rgb and a and adding them next to each other in the output video

    28 janvier 2019, par Nikolaus

    I am trying to split a gif into a rgb layer and a alpha layer and putting the outputs next to each other in a mp4.

    ffmpeg -i yB.gif -filter_complex "[0:v]alphaextract[a]; [0:v][a]hstack=inputs=2;" test.mp4

    I always get the error message: No such filter: ''

    Can anyone help me with this command?

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