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• How do I get an InputStream out of a Mono ?

  30 octobre 2022, par Einfari

  Bear with my noobness, I am learning web-flux. I had this simple application that takes a video and extract the audio using FFprobe and FFmpeg, so I thought of redoing it reactively, but I am failing miserably...

  


  Controller :

  


  @PostMapping("/upload")&#xA;public String upload(@RequestPart("file") Mono<filepart> filePartMono, final Model model) {&#xA;    Flux<string> filenameList = mediaComponent.extractAudio(filePartMono);&#xA;    model.addAttribute("filenameList", new ReactiveDataDriverContextVariable(filenameList));&#xA;    return "download";&#xA;}&#xA;</string></filepart>

  


  Function to get audio streams out of the video :

  


  public Mono<ffproberesult> getAudioStreams(InputStream inputStream) {&#xA;    try {&#xA;        return Mono.just(FFprobe.atPath(FFprobePath)&#xA;                .setShowStreams(true)&#xA;                .setSelectStreams(StreamType.AUDIO)&#xA;                .setLogLevel(LogLevel.INFO)&#xA;                .setInput(inputStream)&#xA;                .execute());&#xA;    } catch (JaffreeException e) {&#xA;        log.error(e.getMessage(), e);&#xA;        throw new MediaException("Audio formats could not be identified.");&#xA;    }&#xA;}&#xA;</ffproberesult>

  


  Attempt 1 :

  


  public Flux<string> extractAudio(Mono<filepart> filePartMono) {&#xA;    filePartMono.flatMapMany(Part::content)&#xA;            .map(dataBuffer -> dataBuffer.asInputStream(true))&#xA;            .flatMap(this::getAudioStreams)&#xA;            .subscribe(System.out::println);&#xA;    ...&#xA;}&#xA;</filepart></string>

  


  Attempt 2 :

  


  public Flux<string> extractAudio(Mono<filepart> filePartMono) {&#xA;    filePartMono.flatMapMany(Part::content)&#xA;            .reduce(InputStream.nullInputStream(), (inputStream, dataBuffer) -> new SequenceInputStream(&#xA;                    inputStream, dataBuffer.asInputStream()&#xA;            ))&#xA;            .flatMap(this::getAudioStreams)&#xA;            .subscribe(System.out::println);&#xA;    ...&#xA;}&#xA;</filepart></string>

  


  Attempt 3 :

  


  public Flux<string> extractAudio(Mono<filepart> filePartMono) {&#xA;    DataBufferUtils.write(filePartMono.flatMapMany(Part::content), OutputStream.nullOutputStream())&#xA;            .map(dataBuffer -> dataBuffer.asInputStream(true))&#xA;            .flatMap(this::getAudioStreams)&#xA;            .subscribe(System.out::println);&#xA;    ...&#xA;}&#xA;</filepart></string>

  


  Attempt 1 and 3 seems to be the same in the end, FFprobe complains as follows :

  


  2022-10-30 11:24:30.292  WARN 79049 --- [         StdErr] c.g.k.jaffree.process.BaseStdReader      : [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9162702340] [warning] STSZ atom truncated
2022-10-30 11:24:30.292 ERROR 79049 --- [         StdErr] c.g.k.jaffree.process.BaseStdReader      : [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9162702340] [error] stream 0, contradictionary STSC and STCO
2022-10-30 11:24:30.292 ERROR 79049 --- [         StdErr] c.g.k.jaffree.process.BaseStdReader      : [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9162702340] [error] error reading header
2022-10-30 11:24:30.294 ERROR 79049 --- [         StdErr] c.g.k.jaffree.process.BaseStdReader      : [error] tcp://127.0.0.1:51532: Invalid data found when processing input
2022-10-30 11:24:30.295  INFO 79049 --- [oundedElastic-3] c.g.k.jaffree.process.ProcessHandler     : Process has finished with status: 1
2022-10-30 11:24:30.409 ERROR 79049 --- [oundedElastic-3] c.e.s.application.MediaComponent         : Process execution has ended with non-zero status: 1. Check logs for detailed error message.


  


  Attempt 2 produces multiple of these :

  


  Exception in thread "Runnable-0" java.lang.StackOverflowError
    at java.base/java.io.SequenceInputStream.read(SequenceInputStream.java:198)


  


  Could anybody point me in the right direction ? What am I doing wrong ? By the way, I am outputting to console just to see a result, but in the end I need to take all the outputted streams and pass them as arguments to another function that will finally extract the audio, so I need to figure out that as well.

  


  Thank you in advance.

  


• How to convert png images to a HEVC(h265) video with alpha

  20 décembre 2022, par ImWH

  I want to convert a sequence of png images to a HEVC video with alpha, I would like to use ffmpeg to do this work and find the following command(images name are p01.png, p02.png...) :

  


  ffmpeg -framerate 10 -i p%02d.png -c:v hevc_videotoolbox -require_sw 1 -allow_sw 1 -alpha_quality 0.5 -vtag hvc1 hevc.mov


  


  the print is here :

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.202)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2_1 --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-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --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-videotoolbox --enable-neon
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, image2, from 'p%02d.png':
  Duration: 00:00:09.60, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: png, rgba(pc), 375x812 [SAR 3779:3779 DAR 375:812], 10 fps, 10 tbr, 10 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> hevc (hevc_videotoolbox))
Press [q] to stop, [?] for help
[1]    16348 trace trap  ffmpeg -framerate 10 -i p%02d.png -c:v hevc_videotoolbox -require_sw 1  1  0.


  


  It seems like there is no error and the video has been generated but the size of video is always 0kb, I try to change the parameter for command but nothing changed, so is there something working with the command ? or Is there is a simple way to create the HEVC video using png image ? Thanks

  


  My Environment :
Apple silicon(MacBook with M1 Pro clip) Mac OS 13.0
ffmpeg : 5.1.2

  


• How to remove black bars with ffmpeg ?

  3 novembre 2022, par watch-this

  I'm trying to remove black bars from a 637×478 video

  


  

  


  here's what happens :

  


  % ffmpeg -i sfu11.mp4 -vf "scale=ih*16/9:ih,scale=iw:-2,setsar=1" -y out.mp4 
ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.102)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --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-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --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-videotoolbox
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sfu11.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf57.83.100
  Duration: 01:02:49.37, start: 0.000000, bitrate: 15 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 99.833000
      Metadata:
        title           : Chapter 01
    Chapter #0:1: start 99.833000, end 701.818000
      Metadata:
        title           : Chapter 02
    Chapter #0:2: start 701.818000, end 1213.746000
      Metadata:
        title           : Chapter 03
    Chapter #0:3: start 1213.746000, end 1726.892000
      Metadata:
        title           : Chapter 04
    Chapter #0:4: start 1726.892000, end 2167.882000
      Metadata:
        title           : Chapter 05
    Chapter #0:5: start 2167.882000, end 2816.430000
      Metadata:
        title           : Chapter 06
    Chapter #0:6: start 2816.430000, end 3769.366000
      Metadata:
        title           : Chapter 07
  Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, progressive), 708x478 [SAR 9:10 DAR 1593:1195], 544 kb/s, 23.98 fps, 23.98 tbr, 24k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 341 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](eng): Data: bin_data (text / 0x74786574)
    Metadata:
      handler_name    : SubtitleHandler
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7f8630806e00] width not divisible by 2 (849x478)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0x7f8630809d00] Qavg: 15927.165
[aac @ 0x7f8630809d00] 2 frames left in the queue on closing
Conversion failed!


  


  However, the same flags work using ffplay but I get horizontal black bars instead.

  


  % ffplay -i sfu11.mp4 -vf "scale=ih\*16/9:ih,scale=iw:-2,setsar=1"


  


  

  


  I also tried using the cropdetect filter. It doesn't work and end up with the very same black bars while passing -vf crop=....