I've just downloaded ffmpeg since it seems to perfectly match my needs (make a video from a set of pictures). I'm currently playing around with some examples just to get started and there's something weird happening that I can't explain. I'm trying this command (provided in the official documentation):
ffmpeg -f image2 -pattern_type glob -i 'foo-*.jpeg' -r 12 -s WxH foo.avi
on a data set of 10 jpg pictures (of course I changed the pattern with '*.jpg'). The video seems to be encoded correctly but it's simply too fast to be sure about that (anyway it stops on the last frame that corresponds to the last picture). In order to get a longer video i thought to low the frame rate from 12 to 1 (one sec each picture) or 0.5 (2 sec each one) and so on.. no way! with low rate values even if the video is played the pictures are simply not displayed. The player (VLC in my case) just shows a blank/empty video for a few seconds.
Am I making something wrong or have I misunderstood the -r parameter? Is it something related to codecs involved? Finally.. How can i get each picture displayed for 1 or 2 seconds?
Here's the output:
MacBook-Pro$ ffmpeg -f image2 -pattern_type glob -i '*.jpg' -r 1 -s 200x300 foo.avi ffmpeg version N-52517-g1e4f75d Copyright (c) 2000-2013 the FFmpeg developers built on Apr 27 2013 19:41:11 with llvm-gcc 4.2.1 (LLVM build 2336.11.00) configuration: --disable-yasm libavutil 52. 27.101 / 52. 27.101 libavcodec 55. 6.100 / 55. 6.100 libavformat 55. 3.100 / 55. 3.100 libavdevice 55. 0.100 / 55. 0.100 libavfilter 3. 61.100 / 3. 61.100 libswscale 2. 2.100 / 2. 2.100 libswresample 0. 17.102 / 0. 17.102 Input #0, image2, from '*.jpg': Duration: 00:00:00.40, start: 0.000000, bitrate: N/A Stream #0:0: Video: mjpeg, yuvj422p, 2560x1920 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc File 'foo.avi' already exists. Overwrite ? [y/N] y Output #0, avi, to 'foo.avi': Metadata: ISFT : Lavf55.3.100 Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 200x300 [SAR 2:1 DAR 4:3], q=2-31, 200 kb/s, 1 tbn, 1 tbc Stream mapping: Stream #0:0 -> #0:0 (mjpeg -> mpeg4) Press [q] to stop, [?] for help frame= 2 fps=0.0 q=2.0 Lsize= 43kB time=00:00:02.00 bitrate= 177.1kbits/s dup=0 drop=8 video:38kB audio:0kB subtitle:0 global headers:0kB muxing overhead 15.099197% MacBook-Pro$