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How is video decoding corruption debugged ?

20 novembre 2013, par TopGunCoder
I just started working for a new company and my new role demands that I help debug the video corruption that they are receiving through decoding frames. As much as I intend on digging down deep into the code and looking into the specifics of my problem, it made me think about video debugging in general.

Since handling videos is very new to me, the whole process seems pretty complex and it seems there are a lot of places for corruption to present itself. The way I see it there is at least three places where corruption could pop up (barring memory corruption from the machine):
- Transporting the data before it is decoded
- decoding implementation that perpetuates corruption once it is encountered, or is all together incorrect (Which seems to be my problem)
- Transportation to the monitor(which seems unlikely but possible)
So what i'm really curious about is if/how people debug their video streams to determine the location of any potential corruption they are encountering. I'm sure there is no sure fire method but I am curious to see what problems are even possible and how they can be identified and triaged.

P.S. - I'm not sure of the differences between different decoding methods but, if this question seems too vague maybe it helps to mention I am using ffmpeg and avcodec_decode_video2 for the decoding.
OS X Mavericks broken OpenCV VideoCapture frame numbers ?

20 novembre 2013, par MattP
Fresh install of Mavericks, managed to install ffmpeg via homebrew and compile the latest OpenCV at time of writing. My code is written in Python (though this shouldn't affect this issue) and basically navigates a video file using the VideoCapture class with the properties set frame position and get current position.

The issue is, on prior versions of OS X, various Linux and Windows boxes, this works without issue. Each frame number is of the format i.0, where i is the current frame number (why it is a float anyway is confusing, alas it's how OpenCV gives it back). However, on this setup I get frame progressions like:
```
0.0 -> 1.3972597329753 -> 2.999999999 -> 3.9999999 -> 5.0 -> 6.252323552
```
This makes using the properties for getting / setting the current frame position impossible and, as one would imagine, causes the automated playback thereof to fail. I can only assume ffmpeg is reporting things odd such that OpenCV is incorrectly calculating frames, but have been unable to rectify this.

Has anyone any insight into the problem, and/or possible solution? Thanks.

Android FFmpeg sometimes works and sometimes crashes

20 novembre 2013, par Pawel Cala

I compiled FFmpeg for Android ( https://gitorious.org/android-ffmpeg ) but when I'm trying to do some operations ( f.e filters cropping, transpose, trim etc ) it crashes in 5 on 10 cases. Error logs are not the same so I assume that it might be caused by memory issues. I'm using OSX, NDK android-ndk-r9b : darwing x86_64. Native ffmpeg method is passing args to ffmpeg.c main method. It's executed in AsyncTask in Activity. Thanks in advance

EDIT: I forgot to mention that programs algorithm runs like that: Press Button - > Open Camera Intent - > Start recording - > After recording copy file to project folder ( on SD card ) - > Open edit activity + Start asynctask

EDIT2: Tested on HTC ONE with different video resolutions

Version and config of ffmpeg

11-20 12:15:23.001: I/ff-log(19091): ffmpeg version 0.10.2.git
11-20 12:15:23.001: I/ff-log(19091):  Copyright (c) 2000-2012 the FFmpeg developers
11-20 12:15:23.001: I/ff-log(19091):   built on Nov 20 2013 12:12:46 with gcc 4.6 20120106 (prerelease)
11-20 12:15:23.001: I/ff-log(19091):   configuration: --target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --cpu=armv7-a --disable-ffplay --disable-ffserver --disable-network --disable-avdevice --enable-protocol=file --enable-hwaccel=mpeg4_vaapi --enable-hwaccel=h264_vaapi --sysroot=/Users/dpc/Developer/android-ndk-r9b/platforms/android-9/arch-arm --disable-decoder=h264_vdpau --prefix=build/armv7-a --disable-asm --enable-small --disable-everything --enable-decoder=mjpeg --enable-parser=mjpeg --enable-muxer=mp4 --enable-muxer=h264 --enable-muxer=h263 --enable-muxer=yuv4mpegpipe --enable-muxer=mov --enable-demuxer=mpegvideo --enable-demuxer=mjpeg --enable-demuxer=image2 --enable-demuxer=mp4 --enable-demuxer=aac --enable-demuxer=ac3 --enable-demuxer=mp3 --enable-demuxer=yuv4mpegpipe --enable-demuxer=mov --enable-decoder=mpegvideo --enable-decoder=mpeg4 --enable-decoder=mp3 --enable-decoder=ac3 --enable-decoder=aac --enable-decoder=h264 --enable-decoder=h263 --enable-decoder=rawvideo --enable-decoder=yuv4 --enable-decoder=png --enable

Sample comand:

1-20 12:15:22.991: I/FFMPEG(19091): CMD:-i file:/storage/emulated/0/.project/videos/mac_video_tmp.mp4 -vf crop=1079:1079:0:420 -vcodec mpeg4 -sameq -acodec copy file:/storage/emulated/0/.project/videos/croppedVid.mp4

Some output errors:

1st type:

   11-20 12:15:23.011: I/ff-log(19091):   libavutil      51. 46.100 / 51. 46.100
11-20 12:15:23.011: I/ff-log(19091):   libavcodec     54. 14.101 / 54. 14.101
11-20 12:15:23.011: I/ff-log(19091):   libavformat    54.  3.100 / 54.  3.100
11-20 12:15:23.011: I/ff-log(19091):   libavfilter     2. 70.100 /  2. 70.100
11-20 12:15:23.011: I/ff-log(19091):   libswscale      2.  1.100 /  2.  1.100
11-20 12:15:23.011: I/ff-log(19091):   libswresample   0. 11.100 /  0. 11.100
11-20 12:15:23.011: I/ff-log(19091): before parsing options
11-20 12:15:23.011: I/ff-log(19091): before parsing options
11-20 12:15:23.011: I/ff-log(19091): parse options
11-20 12:15:23.011: I/ff-log(19091): prepare app arguments !!! NOT defined(_WIN32) && !defined(__MINGW32CE__) !
11-20 12:15:23.011: I/ff-log(19091): after prepare app arguments
11-20 12:15:23.011: I/ff-log(19091): ffurl_open: file:/storage/emulated/0/.project/videos/mac_video_tmp.mp4, 1
11-20 12:15:23.011: I/ff-log(19091): ffurl_alloc: file:/storage/emulated/0/.project/videos/mac_video_tmp.mp4, 1
11-20 12:15:23.011: I/ff-log(19091): ffurl_alloc: file
11-20 12:15:23.011: I/ff-log(19091): ffurl_open alloc: 0
11-20 12:15:23.011: I/ff-log(19091): ffurl_connect
11-20 12:15:23.011: I/ff-log(19091): ffurl_open connect: 0
11-20 12:15:23.011: I/ff-log(19091): Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
11-20 12:15:23.011: I/ff-log(19091): ISO: File Type Major Brand: isom
11-20 12:15:23.021: I/ff-log(19091): File position before avformat_find_stream_info() is 8458240
11-20 12:15:23.041: A/libc(19091): Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 19091 (t.android.utils)

Second type:

11-20 12:17:04.800: I/ff-log(19632):   libavutil      51. 46.100 / 51. 46.100
11-20 12:17:04.800: I/ff-log(19632):   libavcodec     54. 14.101 / 54. 14.101
11-20 12:17:04.800: I/ff-log(19632):   libavformat    54.  3.100 / 54.  3.100
11-20 12:17:04.800: I/ff-log(19632):   libavfilter     2. 70.100 /  2. 70.100
11-20 12:17:04.800: I/ff-log(19632):   libswscale      2.  1.100 /  2.  1.100
11-20 12:17:04.800: I/ff-log(19632):   libswresample   0. 11.100 /  0. 11.100
11-20 12:17:04.800: I/ff-log(19632): before parsing options
11-20 12:17:04.800: I/ff-log(19632): before parsing options
11-20 12:17:04.800: I/ff-log(19632): parse options
11-20 12:17:04.800: I/ff-log(19632): prepare app arguments !!! NOT defined(_WIN32) && !defined(__MINGW32CE__) !
11-20 12:17:04.800: I/ff-log(19632): after prepare app arguments
11-20 12:17:04.800: I/ff-log(19632): opt_output_file ܞ�f��f��f��f���flated/0/.project/videos/mac_video_tmp.mp4
11-20 12:17:04.800: I/ff-log(19632): ffurl_alloc: ܞ�f��f��f��f���flated/0/.project/videos/mac_video_tmp.mp4, 0
11-20 12:17:04.800: I/ff-log(19632): ffurl_alloc: file
11-20 12:17:04.800: I/ff-log(19632): ffurl_open: ܞ�f��f��f��f���flated/0/.project/videos/mac_video_tmp.mp4, 2
11-20 12:17:04.800: I/ff-log(19632): ffurl_alloc: ܞ�f��f��f��f���flated/0/.project/videos/mac_video_tmp.mp4, 2
11-20 12:17:04.800: I/ff-log(19632): ffurl_alloc: file
11-20 12:17:04.800: I/ff-log(19632): ffurl_open alloc: 0
11-20 12:17:04.800: I/ff-log(19632): ffurl_connect
11-20 12:17:04.800: I/ff-log(19632): ffurl_open connect: -2
11-20 12:17:04.800: I/ff-log(19632): ffurl_open FAIL
11-20 12:17:04.800: I/ff-log(19632): ܞ�f��f��f��f���flated/0/.project/videos/mac_video_tmp.mp4: No such file or directory

( CHARSER IS AS IT'S IN OUTPUT LOGCAT )

3rd type:

11-20 12:18:23.243: I/ff-log(19867):   libavutil      51. 46.100 / 51. 46.100
11-20 12:18:23.243: I/ff-log(19867):   libavcodec     54. 14.101 / 54. 14.101
11-20 12:18:23.243: I/ff-log(19867):   libavformat    54.  3.100 / 54.  3.100
11-20 12:18:23.243: I/ff-log(19867):   libavfilter     2. 70.100 /  2. 70.100
11-20 12:18:23.243: I/ff-log(19867):   libswscale      2.  1.100 /  2.  1.100
11-20 12:18:23.243: I/ff-log(19867):   libswresample   0. 11.100 /  0. 11.100
11-20 12:18:23.243: I/ff-log(19867): before parsing options
11-20 12:18:23.243: I/ff-log(19867): before parsing options
11-20 12:18:23.243: I/ff-log(19867): parse options
11-20 12:18:23.243: I/ff-log(19867): prepare app arguments !!! NOT defined(_WIN32) && !defined(__MINGW32CE__) !
11-20 12:18:23.243: I/ff-log(19867): after prepare app arguments
11-20 12:18:23.243: I/ff-log(19867): Unknown decoder '��f('
11-20 12:18:23.243: I/ff-log(19867): exit_program 1
11-20 12:18:23.243: I/ff-log(19867): exit_program 1
11-20 12:18:23.243: I/ff-log(19867): exit_program 2
11-20 12:18:23.253: A/libc(19867): @@@ ABORTING: invalid address or address of corrupt block 0x1d3422d passed to dlfree
11-20 12:18:23.253: A/libc(19867): Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 20393 (AsyncTask #2)

4th type:

11-20 12:20:07.214: I/ff-log(20660):   libavutil      51. 46.100 / 51. 46.100
11-20 12:20:07.214: I/ff-log(20660):   libavcodec     54. 14.101 / 54. 14.101
11-20 12:20:07.214: I/ff-log(20660):   libavformat    54.  3.100 / 54.  3.100
11-20 12:20:07.214: I/ff-log(20660):   libavfilter     2. 70.100 /  2. 70.100
11-20 12:20:07.214: I/ff-log(20660):   libswscale      2.  1.100 /  2.  1.100
11-20 12:20:07.214: I/ff-log(20660):   libswresample   0. 11.100 /  0. 11.100
11-20 12:20:07.214: I/ff-log(20660): before parsing options
11-20 12:20:07.214: I/ff-log(20660): before parsing options
11-20 12:20:07.214: I/ff-log(20660): parse options
11-20 12:20:07.214: I/ff-log(20660): prepare app arguments !!! NOT defined(_WIN32) && !defined(__MINGW32CE__) !
11-20 12:20:07.214: I/ff-log(20660): after prepare app arguments
11-20 12:20:07.214: I/ff-log(20660): Unknown decoder ''
11-20 12:20:07.214: I/ff-log(20660): exit_program 1
11-20 12:20:07.214: A/libc(20660): Fatal signal 11 (SIGSEGV) at 0x2d007165 (code=1), thread 21017 (AsyncTask #2)

Properly open audio files with libav/ffmpeg

20 novembre 2013, par Hyndrix
I am trying to decode audio samples from various file formats using ffmpeg. Therefore I have started some experimenting based on the code in this discussion: How to decode audio via FFmpeg in Android . I use the latest FFMPEG release (1.0) and compile it using https://github.com/halfninja/android-ffmpeg-x264
```
AVFormatContext * pFormatCtx;

avcodec_register_all();
av_register_all();

int lError;
if ((lError = avformat_open_input(&pFormatCtx, filename, NULL, 0))
        != 0) {
    LOGE("Error open source file: %d", lError);
    return;
}
if ((lError = avformat_find_stream_info(pFormatCtx, 0)) < 0) {
    LOGE("Error find stream information: %d (Streams: %d)", lError, pFormatCtx->nb_streams);
    return;
}
LOGE("audio format: %s", pFormatCtx->iformat->name);
LOGE("audio bitrate: %d", pFormatCtx->bit_rate);
audioStreamIndex = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_AUDIO,
        -1, -1, &codec, 0);

//if (audioStreamIndex < 0 || audioStreamIndex >= pFormatCtx->nb_streams)
//  audioStreamIndex = 0;

LOGE("Stream: %d (total: %d)", audioStreamIndex, pFormatCtx->nb_streams);
LOGE("audio codec: %s", codec->name);
```
FFMPEG is compiled using enable-decoder=mp1/mp2/mp3/ogg/vorbis/wav/aac/theora and without any external libraries (e.g. libmp3lame, libtheora, etc.)

Opening of mp3 and wav files works without problems producing the following output for instance for mp3:

audio format: mp3

audio bitrate: 256121

stream: 0 (total: 1)

audio codec: mp3

But when I try to open an ogg file I get this:

Error find stream information: -1 (Streams: 1)

When I manually set audioStreamIndex=0 and comment out the return statement:

Error find stream information: -1 (Streams: 1)

audio format: mp3

audio bitrate: 0

stream: 0 (total: 1)

audio codec: mp3

For m4a (AAC) I get this:

audio format: mp3

audio bitrate: 288000

stream: 0 (total: 1)

audio codec: mp1

but later it fails in avcodec_decode_audio3.

I also tried to manually force a format without success:
```
AVInputFormat *pForceFormat= av_find_input_format("ogg");
if ((lError = avformat_open_input(&pFormatCtx, filename, pForceFormat, 0))
// continue
```
Is there something wrong with the loading code which makes it only work with mp3 and wav and fails for other formats?

Regards,

( C# / VB FFMPEG Wrapper ) How can I parse progress of conversion video to audio ?

20 novembre 2013, par Alaa Alrifaie

I'd try to become specific as much as I can .

I searched a lot to find a good .net wrapper for FFMPEG, the best was VB FFmpeg Wrapper

I'm so bad at using VB.net, and the problem was that I want to use this library in a C# project but I couldn't convert the example program I found from VB.net to C# correctly .

So, I've edited my C# application, so it writes input video file path to a temporary .txt file .. then run the "Converter" ( Which is written in VB ) !

The code of my "Converter" :

Imports System
Imports System.IO

Public Class Form1
    Public WithEvents MediaConverter As New FFLib.Encoder

    Private Sub ConOut(ByVal prog As String, ByVal tl As String) Handles MediaConverter.Progress
        OperationPrgrss.Value = prog
        Application.DoEvents()
    End Sub

    Private Sub stat(ByVal status) Handles MediaConverter.Status
        StatusLbl.Text = status
        Application.DoEvents()
    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Try
            Using PathFinder As New StreamReader("_temp.txt")
                Dim SrcPath As String
                SrcPath = PathFinder.ReadLine()
                PathTxtBox.Text = SrcPath
            End Using
        Catch ex As Exception
            MessageBox.Show("The file couldn't be read : " & Environment.NewLine & ex.Message)
        End Try
    End Sub


    Private Sub Form1_Shown(sender As Object, e As EventArgs) Handles MyBase.Shown
        MediaGenerator.RunWorkerAsync()
    End Sub

    Private Sub MediaGenerator_DoWork(sender As Object, e As ComponentModel.DoWorkEventArgs) Handles MediaGenerator.DoWork
        MediaConverter.OverWrite = False
        MediaConverter.SourceFile = PathTxtBox.Text
        MediaConverter.Format = MediaConverter.Format_MP3
        MediaConverter.AudioCodec = MediaConverter.AudioCodec_mp3
        MediaConverter.Video_Codec = MediaConverter.Vcodec_NONE

        MediaConverter.Threads = 0
        MediaConverter.OverWrite = True

        Dim OutputFldr As String = AppDomain.CurrentDomain.BaseDirectory & "MP3Files\\"
        MediaConverter.OutputPath = OutputFldr
        MediaConverter.AnalyzeFile()

        MediaConverter.Encode()
    End Sub
End Class

What I'm trying to do is converting a video file [ sometime it's WEBM, FLV, MP4 or 3GP ], and the above code does it successfully, but the problem is when using :

MediaConverter.Video_Codec = MediaConverter.Vcodec_NONE

the progress bar doesn't work, it's value remains 0 ! & When I use any Video codec it works perfectly [ the progress bar ], but the created MP3 file won't work ever with any media player, or in Smartphone & Tv's .. etc ;

...

So, what's the problem ?! and how can I solve it ? I tried a lot to change some functions in the wrapper library source, but as I mentioned before ... I'm just a newbie @ VB.net :\

1 | ... | 8914 | 8915 | 8916 | 8917 | 8918 | 8919 | 8920 | 8921 | 8922 | ... | 9783

Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

How is video decoding corruption debugged ?

OS X Mavericks broken OpenCV VideoCapture frame numbers ?

Android FFmpeg sometimes works and sometimes crashes

Properly open audio files with libav/ffmpeg

( C# / VB FFMPEG Wrapper ) How can I parse progress of conversion video to audio ?

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