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hugon samy | 22 May 2013 14:43
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command line for use microphone stream

Dear User,

I would like to drawn your attention about ffmpeg.

Here, I would like to know the command line that allows me to capture my
live microphone and able to diffuse through an IP.

BR,
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暗夜龙凌 | 22 May 2013 04:49
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About audio convert

Firstly, I am costing your time,but it’s really emergency.
I am developing a program about audio convert，it’s my graduation design for my university.
I use C# call avconv to work it out,but it’s not work.
Here is my call function:
public static void ExcuteProcess(string exe, string arg)  
        {
            System.Diagnostics.ProcessStartInfo p = new System.Diagnostics.ProcessStartInfo(exe, arg);
            p.UseShellExecute = false;    
            p.CreateNoWindow = true; 
            p.RedirectStandardError = true; 
            p.RedirectStandardOutput = true;
            System.Diagnostics.Process listFiles;
            listFiles = System.Diagnostics.Process.Start(p);
            System.IO.StreamReader myOutput = listFiles.StandardOutput;
            System.IO.StreamReader myOut = listFiles.StandardError;
            listFiles.WaitForExit();
            if (listFiles.HasExited)
            {
                output = myOutput.ReadToEnd();
                errorput = myOut.ReadToEnd();
            } 
        }  
Here is my code:
string in_file = "D:\\One.mp3";
            string out_file = "D:\\test.wav";
            //Boolean ret = false;
            //ret = convertAudio(in_file, out_file);
            //if (!ret)
            //    MessageBox.Show("failed!");
            //else
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Virginia | 22 May 2013 17:47
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Transmux H.264 MP4 to MPEG-TS?

I have MP4 multiple bitrate (MBR) files that I need to keep the H.264/AAC
streams and transmux into MPEG-TS so that I can package them as HLS
packages. Does anyone know if this is possible with FFmpeg and how I would
pass through the basename to the output as well?

Thanks in advance.
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Matthew Morgan | 22 May 2013 13:08
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deinterlacing with ntsc-dvd

I'm having trouble with some material I'm converting to DVD with ffmpeg; there is significant ghosting on
some players, and some google searches have pointed out that this is often related to interlacing.

The source materialis interlaced, top-field dominant, but when I run it throughffmpeg using "-target
ntsc-dvd", mediainfo shows the output as being progressive.

Here is my ffmpeg command line:

ffmpeg -i dora_fairytale_cut.mpg -pass 1 -target ntsc-dvd -b:v 4000K /dev/null && ffmpeg -i
dora_fairytale_cut.mpg -pass 2 -target ntsc-dvd -b:v 4000K dora_fairytale_cut_compressed.mpg
ffmpeg version N-53018-ge70e258 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 13 2013 07:50:37 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  configuration: --prefix=/opt/mmedia --enable-libxvid --enable-gpl --enable-libtheora
--enable-libmp3lame --enable-libfaac --enable-nonfree --enable-libv4l2 --enable-x11grab --enable-libvpx
  libavutil      52. 30.100 / 52. 30.100
  libavcodec     55.  9.100 / 55.  9.100
  libavformat    55.  7.100 / 55.  7.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 65.100 /  3. 65.100
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[mpeg  <at>  0xa43ae00] max_analyze_duration 5000000 reached at 5024000 microseconds
[NULL  <at>  0xa43b780] start time is not set in estimate_timings_from_pts
Input #0, mpeg, from 'dora_fairytale_cut.mpg':
  Duration: 00:46:56.26, start: 0.500000, bitrate: 6569 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s
    Stream #0:2[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 8:9 DAR 4:3], 29.97 fps, 29.97 tbr,
90k tbn, 59.94 tbc
(Continue reading)

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Massimo Battistel | 22 May 2013 12:36
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Confusion between PAR and SAR

Hello,
maybe this has already been discussed here:

https://ffmpeg.org/trac/ffmpeg/ticket/1776

but I think there is still something wrong.
I think ffmpeg confuses PAR with SAR.
See the output below. The video is an SD 16:9, DAR is correct, but 64:45 is
the PAR.
SAR is 720/576=1.25.

ffmpeg and ffprobe show the same behaviour.

ffplay version N-50442-g4f0d4ac Copyright (c) 2003-2013 the FFmpeg
developers
  built on Mar  2 2013 15:33:19 with gcc 4.7.2 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib
--enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass
--enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm
--enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid
--enable-zlib
  libavutil      52. 17.103 / 52. 17.103
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.102 / 54. 63.102
(Continue reading)

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肖谋 | 22 May 2013 07:42
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How to fix audio/video out of sync problem

Hi, all.
    I have a mp4 file 1.mp4 in which the audio is about 2 seconds ahead of
video. I want to fix this using ffmpeg without transcoding, just copy.  My
method is a little complicated.
1. use ffmpeg to split the video and audio into two mp4 file :
    ffmpeg -i 1.mp4 -acodec copy -vn video.mp4
    ffmpeg -i 1.mp4 -vcodec copy -an audio.mp4

I found that the duration of the video.mp4 file is 74 seconds and that of
the audio.mp4 is 72 seconds.

2. strip the first 2 seconds of the audio: ffmpeg -i audio.mp4 -ss 2
-acodec copy audio_stripped.mp4
3. merge audio_stripped.mp4 and video.mp4 into one mp4. And the resulting
mp4 is a/v synced.

So, my question is:  is there a simple, effective, automated solution to
fix this kind of problem.
By the way, if the mp4 is transcoded, the resulting mp4 is also a/v synced.

Thanks!

Regards
xiaomou
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Paul Goins | 22 May 2013 07:33
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Webcam capture with ffmpeg on Windows: need help with raw capture + preview window.

Hi,

I've been experimenting with ffmpeg as a replacement for the abysmal
webcam software provided with my Logitech web cam.  I'm not an ffmpeg
pro by any means; I'm studying a lot though and have put in
significant effort to try to figure this out myself.  Pointers would
be really helpful.

Basically, I'm trying to do a "raw" 720p webcam/microphone capture via
dshow, and am also trying to hook in a preview window via ffplay.

My command line looks like this (line breaks inserted for readability):

ffmpeg -f dshow -rtbufsize 1000000k -s 1280x720 -r 30 \
     -i video="Logicool HD Webcam C310":audio="マイク (Realtek High Definition Au" \
     -vcodec copy -acodec copy -r 30 -threads 4 output.avi \
     -s 426x240 -pix_fmt yuv420p -f rawvideo - \
     | ffplay -f rawvideo -pixel_format yuv420p -video_size 426x240 -

And for completeness, my input streams look like:

Input #0, dshow, from 'video=Logicool HD Webcam C310:audio=繝槭う繧ｯ (Realtek High Definition Au':
   Duration: N/A, start: 175477.576000, bitrate: 1411 kb/s
     Stream #0:0: Video: rawvideo, bgr24, 1280x720, 30 tbr, 10000k tbn, 30 tbc
     Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s

Problems encountered are:

1. ffplay output is delayed by a second or two.
(Continue reading)

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Joel | 21 May 2013 20:37
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Installing on Ubuntu Error: libx264 not found

Hi,

I've been using this guide:
https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide

I copy and paste the blocks of test and all seems to go well until the
ffmpeg part.  I get this error:

"ERROR: libx264 not found"

Any ideas on what could be going wrong?

Here's the tail of my log file as well.

Thanks,
Joel

gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
-I/home/jlopez/ffmpeg_build/include -std=c99 -fomit-frame-pointer -pthread
-I/usr/include/fribidi -I/usr/include/freetype2 -I/usr/include/opus -c -o
/tmp/ffconf.PhBG0nPG.o /tmp/ffconf.r04RgI12.c
/tmp/ffconf.r04RgI12.c: In function 'check_vpx_codec_vp9_cx':
/tmp/ffconf.r04RgI12.c:3:51: error: 'vpx_codec_vp9_cx' undeclared (first use
in this function)
/tmp/ffconf.r04RgI12.c:3:51: note: each undeclared identifier is reported
only once for each function it appears in
check_lib x264.h x264_encoder_encode -lx264
check_header x264.h
check_cpp
(Continue reading)

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pavi_elex | 21 May 2013 09:32
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ffmpeg question about full form


Hello,

I want to know the full form of ffmpeg
if mpeg is moving pictures expert group then what is ffmpeg.
Please reply.

---Thanks & Regards
Elex
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Adam Pakuła | 20 May 2013 22:32
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inter and intra matrix

Hi,
Is there any way to pass inter_matrix argument from file?
I would like to write matrix in file and use it as argument for ffmpeg,
because writing list of coefs every time is annoying.
I need this, because I am doing some research about influence of
quantization matrices to encoding quality.

Adam Pakuła
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Robert Krüger | 21 May 2013 18:45
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Alpha not working as expected with geq filter

Hi,

I am trying to generate a test file using nullsrc and the geq filter
to obtain an image that has color and alpha channel values defined by
equations like so:

ffmpeg -f lavfi -i nullsrc=s=256x256:d=0.01 -vf
scale,geq='r=255*(X/W):g=255*(Y/H):b=255*((X/W)*(Y/H)):alpha_expr=255*(1-Y/H)'
-pix_fmt rgba -y ~/tmp/generated-sd-alpha.png

The generated png file does not contain any transparent pixels as far
as I can see and I wonder what I have done wrong. I found trac ticket
#2520 which has some similarities but it is marked as fixed. Full
command line and output:

ffmpeg -f lavfi -i nullsrc=s=256x256:d=0.01 -vf
scale,geq='r=255*(X/W):g=255*(Y/H):b=255*((X/W)*(Y/H)):alpha_expr=255*(1-Y/H)'
-pix_fmt rgba -y ~/tmp/generated-sd-alpha.png
ffmpeg version N-53322-gb1bbd71 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 21 2013 16:18:03 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  configuration: --enable-gpl
  libavutil      52. 33.100 / 52. 33.100
  libavcodec     55. 10.101 / 55. 10.101
  libavformat    55.  7.100 / 55.  7.100
  libavdevice    55.  1.100 / 55.  1.100
  libavfilter     3. 68.101 /  3. 68.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, lavfi, from 'nullsrc=s=256x256:d=0.01':
(Continue reading)

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Gmane