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I have a video file and I'm trying to generate screenshots from it.
When I use this command
ffmpeg -ss 500 -i video_file.mp4 -frames:v 1 -y -s 263*196 output_screenshot.jpg
a screenshot is generated just fine.
When I try with
ffmpeg -ss 900 -i video_file.mp4 -frames:v 1 -y -s 263*196 output_screenshot.jpg
(so 900 instead of 500) I get this error
ffmpeg -ss 900 -i video_file.mp4 -frames:v 1 -y -s 263*196 output_screenshot.jpg
ffmpeg version git-2014-03-11-61f96be Copyright (c) 2000-2014 the FFmpeg developers
built on Mar 11 2014 14:16:57 with gcc 4.7 (Debian 4.7.2-5)
configuration: --enable-gpl --enable-postproc --enable-swscale --enable-pthreads --enable-x11grab --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfdk-aac --enable-libopus --enable-libvpx --enable-libfreetype
libavutil 52. 66.101 / 52. 66.101
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 34.100 / 55. 34.100
libavdevice 55. 11.100 / 55. 11.100
libavfilter 4. 3.100 / 4. 3.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video_file.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: mp41
creation_time : 2014-04-19 13:56:05
title : My Movie
artist :
media_type : 9
season_number : 1
episode_sort : 1
hd_video : 0
Duration: 00:25:45.34, start: 0.000000, bitrate: 1242 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 2586 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 58 tbc (default)
Metadata:
creation_time : 2014-04-19 13:56:05
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
Metadata:
creation_time : 2014-04-19 13:56:05
handler_name : SoundHandler
[swscaler @ 0x332d880] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'output_screenshot.jpg':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: mp41
hd_video : 0
title : My Movie
artist :
media_type : 9
season_number : 1
episode_sort : 1
encoder : Lavf55.34.100
Stream #0:0(eng): Video: mjpeg, yuvj420p, 263x196 [SAR 294:263 DAR 3:2], q=2-31, 200 kb/s, 90k tbn, 29.97 tbc (default)
Metadata:
creation_time : 2014-04-19 13:56:05
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mjpeg)
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A
video:0kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 0.000000%
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
and no screenshot is created. I mention that the file is 25min (about 1500 seconds) so 900 should be a perfectly fine value.
Any ideas what could be wrong?
Does it work when you put the
-ss
part after the input file? – slhck – 2014-04-28T11:08:01.217@slhck no, it will also fail but it will take much more time till it fails. – Alex Flo – 2014-04-29T05:54:59.077
2Have you checked if the input is actually playable up to that point? I sometimes forget to look at the actual material :) – slhck – 2014-04-29T06:13:59.013
@slhck Damn!:) You're so right, that was it, the file reported being some 1500seconds long but it was actually truncated thus the impossibility of generating the screenshots – Alex Flo – 2014-04-29T07:09:44.610
Oh ok. So problem solved. – Rajib – 2014-04-29T07:14:12.623