[FFmpeg-user] Problem generating clip from mpg files

[Mike Grishaber]

Hello All,

 

I am extracting a clip from an mpg video using the following command and the
FFMpeg Windows build downloaded today on Windows 10.

ffmpeg.exe -i 271b.mpg -ss 00:00:05.000 -t 00:00:03.200 -c copy out_271b.mpg

 

I am using the copy parameter to avoid reencoding the clip.

The resulting mpg file only has the audio track, no video.

The following is the FFMpeg screen dump.

 

C:\ffmpeg-20170615\bin>ffmpeg.exe -i 271b.mpg -ss 00:00:05.000 -t
00:00:03.200 -c copy out_271b.mpg

ffmpeg version N-86482-gbc40674 Copyright (c) 2000-2017 the FFmpeg
developers

  built with gcc 7.1.0 (GCC)

  configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va
--enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth
--enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
--enable-iconv --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm
--enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
--enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg
--enable-lzma --enable-zlib

  libavutil  55. 66.100 / 55. 66.100

  libavcodec 57. 99.100 / 57. 99.100

  libavformat57. 73.100 / 57. 73.100

  libavdevice57.  7.100 / 57.  7.100

  libavfilter 6. 92.100 /  6. 92.100

  libswscale  4.  7.101 /  4.  7.101

  libswresample   2.  8.100 /  2.  8.100

  libpostproc54.  6.100 / 54.  6.100

Input #0, mpeg, from '271b.mpg':

  Duration: 00:01:11.44, start: 0.46, bitrate: 2154 kb/s

Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg,
progressive), 640x480 [SAR 1:1 DAR 4:3], 2000 kb/s, 25 fps, 25 tbr, 90k tbn,
50 tbc

Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s

[mpeg @ 00666aa0] VBV buffer size not set, using default size of
130KB

If you want the mpeg file to be compliant to some specification

Like DVD, VCD or others, make sure you set the correct buffer size

Output #0, mpeg, to 'out_271b.mpg':

  Metadata:

encoder : Lavf57.73.100

Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, bt470bg,
progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 2000 kb/s, 25 fps, 25 tbr,
90k tbn, 25 tbc

Stream #0:1: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)

Press [q] to stop, [?] for help

frame=   74 fps=0.0 q=-1.0 Lsize= 786kB time=00:00:03.17
bitrate=2027.2kbits/s speed= 198x

video:730kB audio:50kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.843343%

 

The following is the MediaInfo dump for the original file

General

Complete name:
C:\Raidshare\VidHiRes\PDIR\271b.mpg

Format   : MPEG-PS

File size: 18.3 MiB

Duration : 1 min 11 s

Overall bit rate mode: Constant

Overall bit rate : 2 154 kb/s

 

Video

ID   : 224 (0xE0)

Format   : MPEG Video

Format version   : Version 2

Format profile   : Main@Main

Format settings, BVOP: No

Format settings, Matrix  : Default

Format settings, GOP : N=11

Duration : 1 min 11 s

Bit rate mode: Constant

Bit rate : 2 000 kb/s

Width: 640 pixels

Height   : 480 pixels

Display aspect ratio : 4:3

Frame rate   : 25.000 FPS

Standard : PAL

Color space  : YUV

Chroma subsampling   : 4:2:0

Bit depth: 8 bits

Scan type: Progressive

Compression mode : Lossy

Bits/(Pixel*Frame)   : 0.260

Time code of first frame : 00:00:00:00

Time code source : Group of pictures header

GOP, Open/Closed : Closed

Stream size  : 16.9 MiB (92%)

Color primaries  : BT.601 PAL

Transfer characteristics : BT.470 System B, BT.470 System G

Matrix coefficients  : BT.601

 

Audio

ID   : 

Re: [FFmpeg-user] issues on configuring ffmpeg

[Reindl Harald]

Am 12.06.2017 um 21:47 schrieb Lucas Nadolskis:

Hello.
When running configure I got the following error.

Yasm/nasm not found or to old


and why don't you just install it or follow at least 
http://www.catb.org/esr/faqs/smart-questions.html#beprecise instead 
expect others smell or seek in large logs what OS and software versions 
you are using and have installed?


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Re: [FFmpeg-user] Not Able to install Ffmpeg

[Reindl Harald]

Am 09.06.2017 um 08:41 schrieb RISHABH BAHUKHANDI:

I am not able to install Ffmpeg into my centos 6 server. Please help me in
installing the same.

http://www.catb.org/esr/faqs/smart-questions.html#beprecise
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Re: [FFmpeg-user] libx264 error

[Reindl Harald]

./configure --enable-gpl --enable-libx264 --enable-shared 
--prefix=/user/local


ERROR: libx264 not found

and why don't you just install x264-devel or however your distribution 
calls the package?

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[FFmpeg-user] Ffmpeg closed caption .mxf xdcam file

[Douglas Santos]

Good afternoon,

I would like to know if it is already possible to copy an .mxf file
with closed caption (vbi vanc), without losing it.

I ask this because when I make a copy of the video of an .mxf file
 And only handle the audio in ffmpeg, the closed caption is not preserved.
I would very much appreciate this information if it is possible to
somehow do that.

I saw that an impresario named floripa has software that does just
that and uses the FFMPEG tool, just do not know what the magic they do
to preserve the closed caption.
Thank you very much in advance
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[FFmpeg-user] Timecode injection via FFMPEG

[Tom Drake]

Hi,

Is it possible to inject timecodes (like onFI events in flash live media 
encoder) into live rtmp streams using ffmpeg?

Thanks,

Tom
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Re: [FFmpeg-user] Screen Capture - Windows 10

[Tim Hiles]

 I found this in a Google search.DisableHWAcceleration exists in the
following registry key and that it has a value 0.

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics\

If it does not exist, create a new DWORD *DisableHWAcceleration. *A value
of *1* disables hardware acceleration. A value of 0 enables hardware
acceleration, provided the system meets hardware acceleration requirements.

You can use the above Registry method to disable hardware acceleration
in *Windows
10*.
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Re: [FFmpeg-user] Screen Capture - Windows 10

[Tim Hiles]

And actually this might be better to try starting with first.

https://help.aol.com/articles/how-to-lower-hardware-acceleration-in-windows-7-8
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Re: [FFmpeg-user] Screen Capture - Windows 10

[Tim Hiles]

On Jun 1, 2017 2:15 PM, "Ron Barnes"  wrote:

Hi - I did encounter the error and the link below is not valid.  I will
scour the net for a solution!


https://support.microsoft.com/en-us/help/2728613/-s1023-
error-when-you-install-the-directx-sdk-june-2010#mt2


Strange. That link works for me. Regardless this is what the solution is:
To resolve this issue, you must uninstall all versions of the Visual C++
2010 Redistributable before installing the June 2010 DirectX SDK. You may
have one or more of the following products installed:

   - Microsoft Visual C++ 2010 x86 Redistributable
   - Microsoft Visual C++ 2010 x64 Redistributable

You can use Add or Remove Programs in Control Panel to uninstall the
products. Or, you can run the following commands from an administrator
command prompt:

MsiExec.exe /passive /X{F0C3E5D1-1ADE-321E-8167-68EF0DE699A5}

MsiExec.exe /passive /X{1D8E6291-B0D5-35EC-8441-6616F567A0F7}



After uninstalling the Microsoft Visual C++ 2010 Redistributable products,
you may install the June 2010 DirectX SDK
.

After installing the June 2010 DirectX SDK, you may then reinstall the most
current version of the Visual C++ 2010 Redistributable Package
.


I would even go a step further. And uninstall any newer than 2010 Microsoft
Visual C++ Redistributal packages

Afterwards uninstalling those, install the SDK and then you can Just run
Windows updates afterwards to reinstall the Visual C++ packages (which I do
believe are important)
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[FFmpeg-user] ffserser RTSP configuration

[Shalki Khajone]

​​Hello,



What are the options for RTSPOption in the ffserver configuration file ?

I am trying to stream my webcam video as a live RTSP stream. In my current
configuration, all [DESCRIBE] requests fail and server returns 404 Not
found.
​ What am I doing wrong ? ​



*Ffserver.conf:*



*​HTTPPort 9090*
*RTSPPort 5554*


*HTTPBindAddress 192.168.1.10*

*RTSPBindAddress 192.168.1.10*


*MaxHTTPConnections 2000*

*MaxClients 1000*

*MaxBandwidth 1*
*​​*
*CustomLog /var/log/ffserver.log*

*#NoDefaults*


*##*

*# Definition of the live feeds. Each live feed contains one video*

*# and/or audio sequence coming from an ffmpeg encoder or another*

*# ffserver. This sequence may be encoded simultaneously with several*

*# codecs at several resolutions.*


**


* File /tmp/feed1.ffm*

* FileMaxSize 500M*

**


*##*

*# RTSP examples*


* *

* Feed feed1.ffm*

* Format rtsp*

* RTSPOption rtsp_transport tcp*

* RTSPOption rtsp_flags listen*

* VideoCodec libx264*

* VideoFrameRate 30*

* VideoBitRate 800 *

* VideoSize 400x300*

* AVOptionVideo libx264:crf 30*

* AVOptionVideo libx264:preset fast*

* AVOptionVideo libx264:me_range 16*

* AVOptionVideo libx264:qdiff 4*

* AVOptionVideo libx264:qmin 10*

* AVOptionVideo libx264:qmax 51*

* AVOptionVideo libx264:flags +global_header*




*​​*
*NoAudio*

* StartSendonKey*

* PreRoll 1*

**



*##*

*# Special streams*


*# Server status*


**

*Format status*


*# Only allow local people to get the status*

*ACL allow localhost*

*ACL allow 192.168.0.0 192.168.255.255*


*#FaviconURL http://pond1.gladstonefamily.net:8080/favicon.ico
*

**



*# Redirect index.html to the appropriate site*


**

*URL http://www.ffmpeg.org/ *

**


*​*




*FFSERVER Log:*



*​Thu Jun  8 14:53:26 2017 Codec bitrates do not match for stream 0*

*Thu Jun  8 14:53:26 2017 [ffm @ 0x55164180]Using AVStream.codec to pass
codec parameters to muxers is deprecated, use AVStream.codecpar instead.*

*Thu Jun  8 14:53:26 2017 FFserver started.*

*Thu Jun  8 14:53:40 2017 FFserver started.*

*Thu Jun  8 14:53:48 2017 [ffm @ 0x5609a870]Using AVStream.codec to pass
codec parameters to muxers is deprecated, use AVStream.codecpar instead.*

*Thu Jun  8 14:53:48 2017 192.168.1.10 - - [GET] "/feed1.ffm HTTP/1.1" 200
4175*

*Thu Jun  8 14:54:20 2017 192.168.1.10 - - [DESCRIBE]
"rtsp://192.168.1.10:5554/rtspfeed.h264
 RTSP/1.0" 200 157*

*Thu Jun  8 14:55:09 2017 192.168.1.10 - - [DESCRIBE]
"rtsp://192.168.1.10:5554/rtspfeed.h264
 RTSP/1.0" 200 157*
*​*








*FFMPEG Terminal:*



*​pi37@pi37:~$ sudo ./start-video-streaming.sh *
*[sudo] password for pi37: *

*ffmpeg version 3.2-2+rpi1~xenial1.7 Copyright (c) 2000-2016 the FFmpeg
developers*

*  built with gcc 5.4.0 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) 20160609*

*  configuration: --prefix=/usr --extra-version='2+rpi1~xenial1.7'
--toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf
--incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libebur128 --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame
--enable-libopenjpeg --enable-libopus --enable-libpulse
--enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
--enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack
--enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq
--enable-libzvbi --enable-openal --enable-opengl --enable-sdl2
--enable-x11grab --arch=arm --disable-armv5te --disable-neon
--enable-hardcoded-tables --enable-mmal --enable-omx-rpi
--disable-decoder=mpeg_xvmc --disable-vaapi --disable-vdpau
--disable-runtime-cpudetect --disable-debug
--extra-cflags='-mno-apcs-stack-check -mstructure-size-boundary=32
-mno-sched-prolog' --enable-libdc1394 --enable-libiec61883
--enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264
--enable-shared*

*  libavutil  55. 34.100 / 55. 34.100*

*  libavcodec 57. 64.100 / 57. 64.100*

*  libavformat57. 56.100 / 57. 56.100*

*  libavdevice57.  1.100 / 57.  1.100*

*  libavfilter 6. 65.100 /  6. 65.100*

*  libavresample   3.  1.  0 /  3.  1.  0*

*  libswscale  4.  2.100 /  4.  2.100*

*  libswresample   2.  3.100 /  2.  3.100*

*  libpostproc54.  1.100 / 54.  1.100*

*[video4linux2,v4l2 @ 0x55a6e870] The V4L2 driver changed the video from
400x300 to 352x288*

*Input #0, 

[FFmpeg-user] Not Able to install Ffmpeg

[RISHABH BAHUKHANDI]

hello,

I am not able to install Ffmpeg into my centos 6 server. Please help me in
installing the same.




-- 
Thanks You

Regards
Rishabh Bahukhandi
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Re: [FFmpeg-user] FFMPEG & Panasonic OP-1B MXF decode issue

[Phil Petitpont]

Hi,

I have the same issue :

/We are trying to use FFMPEG to transcode video shot on a broadcast
Panasonic camera that encodes to P2 Long GOP (OP-1B) MXF files. Each file
contains a video stream, a couple of data timecode streams and four
discreet, mono audio streams. Whenever we ask FFMPEG to process this file,
it doesn’t seem to be able to identify all the streams correctly./

Actually even with FFPLAY it is the same issue, video is correctly played
out well but audio is looping randomly

Did you find a way to do it or to find a workaround ? I was thinking of a
way to "force" the input format, it seems that avconv should support op1b
demuxing, but maybe not with the FFMPEG CLI ? 

here's a new sample source file :
https://s3-eu-west-1.amazonaws.com/nb-samples/P2-AVCULTRA12-008ZD9JB.MXF

Phil



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Re: [FFmpeg-user] Compiling FFMPEG with ffplay support

[michelel]

This worked for me:

1. sudo apt-get install libsdl2-dev
2. ./configure --enable-ffplay
3. open FFmpeg/ffbuild/config.mak and check to make sure fflplay and SDL2
are enabled

 FFMPEG_CONFIGURATION= --enable-ffplay
 CFLAGS-ffplay=-D_REENTRANT -I/usr/include/SDL2
 EXTRALIBS-ffplay=-lSDL2
 CONFIG_FFPLAY=yes

4. make





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[FFmpeg-user] Changing video frame rate and keeping duration intact

[Idan Yael]

I am trying to segment a video file, transcode each of the segments and
then stitch them all back to one. The process is working but I have noticed
that the final file has a different duration than the original one.
Probably because I am transcoding to a fixed frame rate which is different
from the source frame rate.

To segment the video I use:

ffmpeg -y -i video_only.mp4 -c copy -flags -global_header -segment_time 50
-break_non_keyframes 0 -reset_timestamps 0 \
  -segment_list file_segs.list -segment_format mp4 -segment_list_type
ffconcat -write_empty_segments 0 \
  -f segment file_seg-%d.mp4

Then, each segment is transcoded with this command:

ffmpeg -y -i $f -vcodec libx264 -vsync 1 -crf 18 -vf "fps=30" -pix_fmt
yuv420p -preset:v fast -profile:v main -level:v 4.1 transcoded/$f

And finally, concat:

ffmpeg -y -f concat -i file_segs.list -c:v copy -c:a copy -movflags
+faststart video_final.mp4

I've tried using "-r 30" instead on the filter (-vf), the same result. As
this is a part of a transcoding system I prefer not to check for the input
file fps before transcoding as it can be anything - variable fps too (which
is not so easy to detect)

Is there any way I can keep the duration intact while changing the frame
rate in this type of transcoding flow?

Thanks,
Idan.
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Re: [FFmpeg-user] Not able to get mono channel output libswresample

[Moritz Barsnick]

On Thu, Jun 15, 2017 at 15:25:57 +0530, amey jain wrote:

> I used libswresample API tutorial on page and it is working.

May I point out that the list "libav-user" is the correct one for
questions regarding the libav* libraries and their APIs?:
https://www.ffmpeg.org/contact.html

You might find help here on ffmpeg-user, but this list is usually for
questions regarding the use of the command line tools.

Regards,
Moritz
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[FFmpeg-user] Not able to get mono channel output libswresample

[amey jain]

Hello all,
I want an output stream of audio, mono channel, down sampled to 5512 Hz,
and output in a float array. I used libswresample API tutorial on page and
it is working. But there are two problems I am facing right now or not able
to understand context.
1. If channel layout is set as AV_CH_LAYOUT_MONO in out_channel_layout, and
number of output samples I get are nb_samples (say), then size of buffer
should be nb_samples * byte_per_sample * nb_channels. Since channel is mono
nb_channel should be one. However when I get size allocated using
av_samples_alloc with sample_fmt AV_SAMPLE_FMT_FLT I get size double of
what I calculated.
2. The output is in an array of uint8_t type and I have selected for output
AV_SAMPLE_FMT_FLT. So is there a way to get output in float or I will have
to convert this output only to float using bitwise operations.

  av_opt_set_channel_layout(swr, "in_channel_layout",
frame->channel_layout, 0);
  av_opt_set_channel_layout(swr, "out_channel_layout", AV_CH_LAYOUT_MONO,
0);
  av_opt_set_int(swr, "in_sample_rate",frame->sample_rate, 0);
  av_opt_set_int(swr, "out_sample_rate", 5512, 0);
  av_opt_set_sample_fmt(swr, "in_sample_fmt", src_sample_fmt, 0);
  av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_FLT, 0);
  ret = swr_init(swr);
  nb_samples = av_rescale_rnd(swr_get_delay(swr, frame->sample_rate) +
frame->nb_samples, 5512, frame->sample_rate, AV_ROUND_UP); //number of
output samples
  // buf_size is double of what calculated by nb_samples * byte_per_sample
* nb_channels
  buf_size = av_samples_alloc(, NULL, 2, out_count, AV_SAMPLE_FMT_FLT,
0);
  ret = swr_convert(swr, , out_count, (const uint8_t **) in, in_count);

Regards
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