[FFmpeg-user] Problem generating clip from mpg files
Mike Grishaber
mgrishaber at merlinone.com
Fri Jun 16 04:06:24 EEST 2017
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
libavformat 57. 73.100 / 57. 73.100
libavdevice 57. 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
libpostproc 54. 6.100 / 54. 6.100
Input #0, mpeg, from '271b.mpg':
Duration: 00:01:11.44, start: 0.460000, 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 @ 0000000000666aa0] 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\PDIR0000\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 at 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 : 192 (0xC0)
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Duration : 1 min 11 s
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 1 channel
Sampling rate : 44.1 kHz
Compression mode : Lossy
Stream size : 1.09 MiB (6%)
And this is the MediaInfo dump from the generated clip.
General
Complete name :
C:\ffmpeg-20170615\bin\out_271b.mpg
Format : MPEG-PS
File size : 786 KiB
Duration : 3 s 187 ms
Overall bit rate mode : Constant
Overall bit rate : 2 020 kb/s
Audio
ID : 192 (0xC0)
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Duration : 3 s 187 ms
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 1 channel
Sampling rate : 44.1 kHz
Compression mode : Lossy
Stream size : 49.8 KiB (6%)
Thanks for your help.
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