[SOLVED] ffmpeg help

mibadt · 2013-12-31 10:29:18

Hi,
I'm failing to create a (approx) 10 sec video from a (approx) 25 sec one.
As can be seen the resultant file is WAY too small.

Please advise!

Thnaks

----------copy of terminal------------

$ ffmpeg -i out.mp4 -ss 00:04:18 -t 00:10:46 -async 1 -strict -2 out2.mp4
ffmpeg version 2.1.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec 28 2013 21:49:15 with gcc 4.8.2 (GCC) 20131219 (prerelease)
  configuration: --prefix=/usr --disable-debug --disable-static --enable-avresample --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.19.104
  Duration: 00:00:25.03, start: 0.000000, bitrate: 9122 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuvj420p(pc, smpte170m), 1280x720 [SAR 1:1 DAR 16:9], 8990 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
No pixel format specified, yuvj420p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
-async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.
[libx264 @ 0xe529a0] using SAR=1/1
[libx264 @ 0xe529a0] using cpu capabilities: MMX2 SSE2Fast LZCNT
[libx264 @ 0xe529a0] profile High, level 3.1
[libx264 @ 0xe529a0] 264 - core 138 r2363 c628e3b - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.19.104
    Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 24k tbn, 23.98 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (aac -> aac)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A    
video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead 509.302326%
miki ~/Chuli $ ls -l
total 56264
-rw-r--r-- 1 miki users 29063772 Dec 31  2013 Chuli_Badt.MOV
-rw-r--r-- 1 miki users      185 Dec 31 11:28 Chuli_Badt2.MOV
-rw-r--r-- 1 miki users 28536839 Dec 31 11:37 out.mp4
-rw-r--r-- 1 miki users      262 Dec 31 12:24 out2.mp4

Last edited by mibadt (2013-12-31 14:22:13)

Trilby · 2013-12-31 12:36:15

You are telling it to start 4 minutes and 18 seconds into a source video which you claim to be 25 seconds long.

mibadt · 2013-12-31 14:21:44

Thanks Trilby, you're right.
I'm shamed I've used minutes instead of seconds..

DrZaius · 2014-01-02 21:26:59

Why are you re-encoding instead of simply re-muxing? Using stream copy mode:

ffmpeg -i out.mp4 -ss 4 -t 10 -codec copy out2.mp4

Arch Linux

#1 2013-12-31 10:29:18

[SOLVED] ffmpeg help

#2 2013-12-31 12:36:15

Re: [SOLVED] ffmpeg help

#3 2013-12-31 14:21:44

Re: [SOLVED] ffmpeg help

#4 2014-01-02 21:26:59

Re: [SOLVED] ffmpeg help

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