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• ffmepg why error :Failed to write core dump

  9 juillet 2021, par dmouse

  I wang to implement a feature that allows me to save RTSP stram as a file,
use javacv implement a demo,but there's an error.
i debug the demo , execute 'recorder.record(frame) ;' error, "ulimit -c unlimited" is useless,the program still reports an error.
review of the source code did note find the problem principle.pleace give me a hand.

  


  import org.bytedeco.javacpp.avcodec;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.FFmpegFrameRecorder;
import org.bytedeco.javacv.Frame;

import java.io.File;
import java.io.IOException;

/**
 * @ClassName video
 * @Description TODO
 * @Author mouse
 * @Date 2021/7/9 11:13
 * @Version 1.0
 **/
public class Video {
    public static void main(String[] args) {
        String streamUrl = "rtsp://admin:12345678.@192.168.20.180:554/h265/ch1/main/av_stream";
        String filePath = "./video/hello.mp3";
        File outFile = new File(filePath);
        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(streamUrl);
        if (!outFile.getParentFile().exists()) {
            outFile.getParentFile().mkdirs();
        }
        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(filePath,1080,1440, 1);
        recorder.setVideoCodec(avcodec.AV_CODEC_ID_H265);
        recorder.setFormat("flv");
        recorder.setVideoBitrate(4000);
        try {
            grabber.start();
            recorder.start();
            Frame frame = grabber.grabFrame();
            while (frame!=null){
                recorder.record(frame);
                frame = grabber.grabFrame();
            }
            recorder.record(frame);
            recorder.stop();
            grabber.stop();

        } catch (FFmpegFrameGrabber.Exception e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (recorder != null) {
                    recorder.stop();
                }
                if (grabber != null) {
                    grabber.stop();
                }
            } catch (FFmpegFrameRecorder.Exception | FFmpegFrameGrabber.Exception e) {
                e.printStackTrace();
            }
        }
    }
}



  


  log error

  


  #
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x0000000131fef233, pid=50498, tid=0x0000000000001003
#
# JRE version: Java(TM) SE Runtime Environment (8.0_281-b09) (build 1.8.0_281-b09)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.281-b09 mixed mode bsd-amd64 compressed oops)
# Problematic frame:
# C  [libavformat.57.dylib+0xbf233]  av_write_frame+0x993
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#


  


  pom :

  


          <dependency>&#xA;            <groupid>org.bytedeco</groupid>&#xA;            <artifactid>javacv</artifactid>&#xA;            <version>1.4.3</version>&#xA;        </dependency>&#xA;        <dependency>&#xA;            <groupid>org.bytedeco.javacpp-presets</groupid>&#xA;            <artifactid>ffmpeg-platform</artifactid>&#xA;            <version>4.0.2-1.4.3</version>&#xA;        </dependency>&#xA;

  


  My os : macOS Bgi Sur 11.4 ;
  
JDK : 1.8.0_281
  
execute 'recorder.record(frame) ;' error,
"ulimit -c unlimited" is useless,the program still reports an error .

  


• MKV video playback shows a black picture and audio plays good

  24 mars 2023, par gbriones.gdl

  I have an MKV video file that has something wrong, every time I start my player, the video shows full black picture and the audio starts playing good, if I use the seek bar to position the playback anywhere in the time, then the video shows correct picture but audio stops playing, eventually (it takes several seconds) audio starts playing again in sync with video.

  


  The player I am using is the one in Kodi 20.1.0, I have tried enabling/disabling HW acceleration without success.

  


  I also tried VLC 3.0.16, which has a simmilar behavior with the exception that video starts showing from the very begining when opening the file, just when seeking the audio stops for several seconds.

  


  I also tried using ffmpeg to reencode the video with different codecs without success, I have tried multiple video and audio codec combinations, and also tried changing the pixel format.

  


  Then eventually I managed to fix the video by extracting streams into separate files, then merge them again, without reencoding, I thought that maybe something could be wrong with the metadata of the video, so I copied the same metadata and final output file still works fine. My question is how can I fix my video without having to split and merge streams ?

  


  Here is the info about my input file :

  


  $ ffmpeg -i S01E08.mkv 
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  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
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, matroska,webm, from 'S01E08.mkv':
  Metadata:
    ENCODER         : Lavf59.27.100
  Duration: 00:25:02.21, start: 0.000000, bitrate: 1382 kb/s
  Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt470bg/unknown/unknown, progressive), 1280x960, 59.94 fps, 59.94 tbr, 1k tbn, 59.94 tbc
    Metadata:
      ENCODER         : Lavc59.37.100 libx265
      DURATION        : 00:25:00.032000000
  Stream #0:1(spa): Audio: aac (HE-AAC), 48000 Hz, stereo, fltp (default)
    Metadata:
      title           : Stereo
      DURATION        : 00:25:02.207000000
  Stream #0:2(jpn): Audio: aac (HE-AAC), 48000 Hz, stereo, fltp
    Metadata:
      title           : Stereo
      DURATION        : 00:25:00.116000000
  Stream #0:3(spa): Subtitle: ass
    Metadata:
      ENCODER         : Lavc59.37.100 ssa
      DURATION        : 00:24:56.585000000
At least one output file must be specified


  


  Here are the steps I followed to fix the video, I had to use mkv format for the outputs because other formats were no good at writing metadata :

  


  ffmpeg -i S01E08.mkv -map 0:v:0 -c:v copy -map_metadata 0 video.mkv
ffmpeg -i S01E08.mkv -map 0:a:0 -c:a copy -map_metadata 0 audio1.mkv
ffmpeg -i S01E08.mkv -map 0:a:1 -c:a copy -map_metadata 0 audio2.mkv
ffmpeg -i S01E08.mkv -map 0:s -c:s copy -map_metadata 0 subs.mkv
ffmpeg -i video.mkv -i audio1.mkv -i audio2.mkv -i subs.mkv -map 0:v -map 1:a -map 2:a -map 3:s -c:v copy -c:a copy -c:s copy -map_metadata 0 -map_metadata 1 -map_metadata 2 -map_metadata 3 -disposition:s:0 0 -default_mode infer_no_subs video_audio.mkv


  


  I had to compare both input and output files :

  


  $ ffmpeg -i video_audio.mkv
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  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
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, matroska,webm, from 'video_audio.mkv':
  Metadata:
    ENCODER         : Lavf58.76.100
  Duration: 00:25:02.21, start: 0.000000, bitrate: 1382 kb/s
  Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt470bg/unknown/unknown, progressive), 1280x960, 59.94 fps, 59.94 tbr, 1k tbn, 59.94 tbc (default)
    Metadata:
      ENCODER         : Lavc59.37.100 libx265
      DURATION        : 00:25:00.031000000
  Stream #0:1(spa): Audio: aac (HE-AAC), 48000 Hz, stereo, fltp (default)
    Metadata:
      title           : Stereo
      DURATION        : 00:25:02.207000000
  Stream #0:2(jpn): Audio: aac (HE-AAC), 48000 Hz, stereo, fltp
    Metadata:
      title           : Stereo
      DURATION        : 00:25:00.116000000
  Stream #0:3(spa): Subtitle: ass
    Metadata:
      ENCODER         : Lavc59.37.100 ssa
      DURATION        : 00:24:56.585000000
At least one output file must be specified

$ ffprobe -show_streams S01E08.mkv > probe_bad.txt
$ ffprobe -show_streams video_audio.mkv > probe_good.txt
$ diff probe_bad.txt probe_good.txt 
32,33c32,33
< duration_ts=1502207
< duration=1502.207000
---
> duration_ts=N/A
> duration=N/A
40c40
< DISPOSITION:default=0
---
> DISPOSITION:default=1
53c53
< TAG:DURATION=00:25:00.032000000
---
> TAG:DURATION=00:25:00.031000000


  


  Then I thought that maybe the disposition flag in the video stream was causing the error, so I ran ffmpeg to copy all streams from my input video S01E08.mkv and added the disposition flag with the following command :

  


  ffmpeg -i S01E08.mkv -map 0:v -map 0:a:0 -map 0:a:1 -map 0:s -c:v copy -c:a copy -c:s copy -map_metadata 0 -disposition:v:0 default -disposition:s:0 0 -default_mode infer_no_subs test.mkv


  


  Still no luck, test.mkv shows no video when opening the file, I had to double check that disposition flag was changed :

  


  $ ffprobe -show_streams test.mkv > probe_bad2.txt
$ diff probe_bad.txt probe_bad2.txt 
40c40
< DISPOSITION:default=0
---
> DISPOSITION:default=1
53c53
< TAG:DURATION=00:25:00.032000000
---
> TAG:DURATION=00:25:00.031000000


  


  In other words I have to focibly split and merge to make the file work correctly. May be I need to set the duration and duration_ts of the video stream to N/A but I don't know how to do this.

  


• Lost video when converting from MKV to MP4 with FFMPEG

  25 décembre 2022, par Francesco Virga

  I'm trying to come up with a robust script to handle all MKV -> MP4 video conversions.

  


  The classic example I've found is ffmpeg -i input.mkv -codec copy output.mp4. This works for most videos, but I find that the video stream gets lost for certain videos. Using -map 0 doesn't help, the examples I'm using only have one video stream and one audio stream.

  


  If I only copy the audio codec, it seems to work fine, but takes much longer since video is re-encoded. For this I'm use ffmpeg -i input.mkv -c:a copy output.mp4. I'm fine to use this for certain videos, but am not sure how to determine whether video re-encoding is needed or not (since I want to avoid it when possible).

  


  Here's the output I get when I run the first command and lose video :

  


  % ffmpeg -i input.mkv -codec copy output.mp4

ffmpeg version N-103075-g4c694093be-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      57.  2.100 / 57.  2.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    CREATION_TIME   :
    ENCODER         : Lavf55.12.0
  Duration: 00:59:15.97, start: 0.062000, bitrate: 1892 kb/s
  Stream #0:0: Video: hevc (Main), yuv420p(tv, bt709), 1912x1072 [SAR 1:1 DAR 239:134], 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(eng): Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
  Stream #0:2(eng): Subtitle: ass (default)
  Stream #0:3(eng): Subtitle: ass
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf59.4.101
  Stream #0:0: Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, bt709), 1912x1072 [SAR 1:1 DAR 239:134], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn (default)
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=32634 fps=0.0 q=-1.0 size=  295424kB time=00:22:41.04 bitrate=1778.1kbits/s speed=2.72e+03x frame=63776 fps=63775 q=-1.0 size=  611840kB time=00:44:19.94 bitrate=1884.3kbits/s speed=2.66e+03frame=85256 fps=62686 q=-1.0 Lsize=  822207kB time=00:59:15.83 bitrate=1894.2kbits/s speed=2.61e+03x
video:736136kB audio:83404kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 0.325361%