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• FFMPEG not exporting audio OR exports audio with still video

  7 septembre 2021, par Zak44

  Trying to utilize ffmpeg to convert a mp4 to DNxHD, then wrap it in an MXF. The ultimate goal is to get this into Avid Media Composer. I've been having issues with this particular command, where no audio is ever exported :

  


  ffmpeg -y -r 24 -i Test_fix.mp4 -vcodec dnxhd -vsync drop -b:v 36M -s 1920x1080 -threads 2 -vf colormatrix=bt601:bt709 -c:a aac -f rawvideo BLAH.mov


  


  If I tweak the above command by removing the force of the "rawvideo" option I get audio, however the video then sits on the first frame and never advances :

  


  ffmpeg -y -r 24 -i Test_fix.mp4 -vcodec dnxhd -vsync drop -b:v 36M -s 1920x1080 -threads 2 -vf colormatrix=bt601:bt709 -c:a aac -r 24 BLAH.mov


  


  What exactly am I doing wrong ? Here is the output from running the second time :

  


  ffmpeg -y -r 24 -i Test_fix.mp4 -vcodec dnxhd -vsync drop -b:v 36M -s 1920x1080 -threads 2 -vf colormatrix=bt601:bt709 -c:a aac -r 24 BLAH.mov
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.4_2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Test_fix.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-07-01T17:19:54.000000Z
  Duration: 00:01:05.75, start: 0.000000, bitrate: 6336 kb/s
  Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 6016 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> dnxhd (native))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'BLAH.mov':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    encoder         : Lavf58.76.100
  Stream #0:0(eng): Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p(tv, bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 36000 kb/s, 24 fps, 12288 tbn (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc58.134.100 dnxhd
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc58.134.100 aac
[mov @ 0x7fd129013000] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[mov @ 0x7fd129013000] Encoder did not produce proper pts, making some up.
frame= 1577 fps=133 q=1.0 Lsize=  290993kB time=00:01:05.70 bitrate=36279.7kbits/s speed=5.54x
video:290168kB audio:809kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005816%
[aac @ 0x7fd129019000] Qavg: 22541.643


  


• node.js ffmpeg spawn child_process unexpected data output

  5 septembre 2021, par PLNR

  
I'm rather new to backend stuff, so please excuse, if my question is trivial.
  
For an Intranet project, I want to present a video element in a webpage (React, HLS.js Player).
  
The video sources are mpeg-ts streams delivered as udp multicast.
  
A small node.js / express server should handle the ffmpeg commands, to transcode the multicast to hls to display them in a browser.
  

  
Problem is the Output :
  
The output is emitted on stderr... even the process is working as expected.
  
Here is the respective code I wrote for transcoding so far :

  


  const express = require("express");
const { spawn, exec } = require("child_process");
const process = require("process")

let ls;

const app = express();

app.get('/cam/:source', (body) => {
    const cam = body.params.source;
    console.log(cam);

    let source = "udp://239.1.1.1:4444";
    let stream = "/var/www/html/streams/tmp/cam1.m3u8"


    stream = spawn("ffmpeg", ["-re", "-i", source, "-c:v", "libx264", "-crf", "21", "-preset", "veryfast", "-c:a", "aac", "-b:a", "128k", "-ac", "2", "-f", "hls", "-hls_list_size", "5", "-hls_flags", "delete_segments", stream], {detached: true});

    stream.stdout.on("data", data => {
        console.log(`stdout: ${data}`);
    });

    stream.stderr.on("data", data => {
        console.log(`stderr: ${data}`);
    });

    stream.on("error", error => {
        console.log(`error: ${error.message}`);
    });

    stream.on("close", code => {
        console.log(`child process exited with code ${code}`);
    });
})

app.listen(5000, ()=> {
    console.log('Listening');
})


  


  This is maybe only cosmetics, but it makes me wondering.
  
Here is the terminal output :

  


  [nodemon] starting `node server.js`
Listening
camera stream reloaded
stderr: ffmpeg version 4.3.2-0+deb11u1ubuntu1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (Ubuntu 10.2.1-20ubuntu1)

  --shortend--


pid:  4206
stderr: frame=    8 fps=0.0 q=0.0 size=N/A time=00:00:00.46 bitrate=N/A speed=0.931x    
pid:  4206
stderr: frame=   21 fps= 21 q=26.0 size=N/A time=00:00:00.96 bitrate=N/A speed=0.95x    
pid:  4206
stderr: frame=   33 fps= 22 q=26.0 size=N/A time=00:00:01.49 bitrate=N/A speed=0.982x    
pid:  4206
stderr: frame=   46 fps= 23 q=26.0 size=N/A time=00:00:02.00 bitrate=N/A speed=0.989x    
pid:  4206
stderr: frame=   58 fps= 23 q=26.0 size=N/A time=00:00:02.49 bitrate=N/A speed=0.986x    
pid:  4206


  


  and so on...
  

  
Any helpful information would be highly appreciated !
  
Many thanks in advance

  


• Spaces in FFMPEG Input Thwart Execution

  2 septembre 2021, par Woolwit

  What's so baffling, is why spaces in the audio input seem to work fine, but spaces in the video input break things.
This fetches random images from a directory, pairs them with random audio clips and joins them into an mp4 video.

  


  def makeAudioImgMovs():
    randImgs = getImgs()
    compAudClips = makeAudioClips()
    audioJpgs = dict(zip(randImgs,compAudClips)) #Heres where we join the completed audio clips and the jpgs into a dict
    for jpg, aud in audioJpgs.items():
        print(f'The img is {jpg}, the type of the img is {type(jpg)} the aud is {aud} the type of the aud is {type(aud)}')
        subprocess.call('ffmpeg -hide_banner -loglevel error -loop 1 -i "{0}" -i "{1}"\
        -filter:v \
        "fade=in:st=0:d=1, fade=out:st=10:d=1,scale=720:480:force_original_aspect_ratio=decrease,pad=720:480:(ow-iw)/2:(oh-ih)/2,setsar=1" \
         -filter:a "afade=in:st=0:d=1, afade=out:st=10:d=1" \
        -c:v libx264 -t 11 -pix_fmt yuv420p -preset faster -shortest -c:a aac {2}.mp4'.format(jpg,aud,timePath/(pathlib.Path(jpg).stem)),shell=True)
makeAudioImgMovs()


  


  The print statement is writing what is in the dict of audioJpgs list. For example...

  


  The img is 2021-09-02-1-40/ponty_me.jpg, the type of the img is the aud is 2021-09-02-1-40/Jms Brn like it is like it was.aiff the type of the aud is

  


  The img is 2021-09-02-1-40/1966taxiToMassFromMomBack 2.tiff, the type of the img is the aud is 2021-09-02-1-40/Lola_Fay.mp3 the type of the aud is

  


  [NULL @ 0x7fe503021400] Unable to find a suitable output format for '2021-09-02-1-40/1966taxiToMassFromMomBack'
2021-09-02-1-40/1966taxiToMassFromMomBack : Invalid argument

  


  The img is 2021-09-02-1-40/1966taxiToMassFromMomBack 5.tiff, the type of the img is the aud is 2021-09-02-1-40/M Miller Lonnie's Lament.aiff the type of the aud is

  


  [NULL @ 0x7fd32a854c00] Unable to find a suitable output format for '2021-09-02-1-40/1966taxiToMassFromMomBack'
2021-09-02-1-40/1966taxiToMassFromMomBack : Invalid argument

  


  The img is 2021-09-02-1-40/10_021390_danny ? 1_jpg.jpg, the type of the img is the aud is 2021-09-02-1-40/i_got_to_rock.mp3 the type of the aud is

  


  [NULL @ 0x7f8449835800] Unable to find a suitable output format for '2021-09-02-1-40/10_021390_danny ?'
2021-09-02-1-40/10_021390_danny ? : Invalid argument

  


  The img is 2021-09-02-1-40/11_021390_danny_2_jpg.jpg, the type of the img is the aud is 2021-09-02-1-40/M Miller Power.aiff the type of the aud is

  


  The last pair of img/aud complete fine and write an mp4. Notice there, that the audio file has spaces in it !
Notice that the errors 'Invalid argument' get thrown where there is a space in the jpg file name.

  


  Help greatly appreciated.