[FFmpeg-user] Combining .webm side by side - frame size changes
Mike Grommet
mgrommet at techfriends.com
Tue Nov 24 05:56:08 CET 2015
I'm trying to combine two .webm videos side by side. Each were recorded
using the kurento WebRTC media server at 640x480. Using the Original
Command below, the videos do combine but with an unexpected result.
During the playback of the combined file, The right side video appears
to zoom in to the top left of itself two times. The originals appear
fine when played individually. I assume it has something to do with
these messages from the ffmpeg run:
Input stream #0:0 frame changed from size:640x480 fmt:yuv420p to
size:480x360 fmt:yuv420p
Input stream #0:0 frame changed from size:480x360 fmt:yuv420p to
size:320x240 fmt:yuv420p
I also attempted a different way to merge the files (See Alternative
Command), and it has the same issue.
Additional note: As an experiment, If I first convert the original
.webm files to .mp4, combine these files together with a .webm final
target, I don't experience this problem. This might be an option, but
it seems to be an awfully hacky solution.
I'm including the these commands , The FFMpeg output (for the original),
and the ffprobe details on each of the source files - I'm pretty new to
ffmpeg, and would appreciate a friendly shove in the right direction.
Original Command:
./ffmpeg -report -i a.webm -vf "[in] pad=2*iw:ih [left]; movie=b.webm
[right]; [left][right] overlay=main_w/2:0 [out]" c.webm
Alternative Command:
./ffmpeg -i a.webm -i b.webm -filter_complex
"[0:v]scale=iw/2:ih/2,pad=2*iw:ih[left];[1:v]scale=iw/2:ih/2[right];[left][right]overlay=main_w/2:0[out]"
-map [out] -map 0:a -map 1:a c.webm
FFProbe: a.webm:
--------------------------
ffprobe version N-51228-g8eadabf-static
http://johnvansickle.com/ffmpeg/ Copyright (c) 2007-2015 the FFmpeg
developers
built with gcc 5.2.1 (Debian 5.2.1-23) 20151028
configuration: --enable-gpl --enable-version3 --disable-shared
--disable-debug --enable-runtime-cpudetect --enable-libmp3lame
--enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex
--enable-libvorbis --enable-libvpx --enable-libfreetype
--enable-fontconfig --enable-libxvid --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg
--enable-libopus --enable-libass --enable-gnutls --enable-libvidstab
--enable-libsoxr --enable-frei0r --enable-libfribidi
--disable-indev=sndio --disable-outdev=sndio --cc=gcc
libavutil 55. 7.100 / 55. 7.100
libavcodec 57. 15.100 / 57. 15.100
libavformat 57. 16.100 / 57. 16.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 15.100 / 6. 15.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, matroska,webm, from 'a.webm':
Metadata:
encoder : GStreamer matroskamux version 1.5.91
creation_time : 2015-11-23 19:54:12
Duration: 00:00:21.81, start: 0.000000, bitrate: 398 kb/s
Stream #0:0(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3,
29.67 tbr, 1k tbn, 1k tbc (default)
Metadata:
title : Video
Stream #0:1(eng): Audio: vorbis, 48000 Hz, stereo, fltp (default)
Metadata:
title : Audio
FFProbe b.webm
------------------------
techfriends at techfriends:~/Downloads/ffmpeg-git-20151120-32bit-static$
./ffprobe b.webm
ffprobe version N-51228-g8eadabf-static
http://johnvansickle.com/ffmpeg/ Copyright (c) 2007-2015 the FFmpeg
developers
built with gcc 5.2.1 (Debian 5.2.1-23) 20151028
configuration: --enable-gpl --enable-version3 --disable-shared
--disable-debug --enable-runtime-cpudetect --enable-libmp3lame
--enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex
--enable-libvorbis --enable-libvpx --enable-libfreetype
--enable-fontconfig --enable-libxvid --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg
--enable-libopus --enable-libass --enable-gnutls --enable-libvidstab
--enable-libsoxr --enable-frei0r --enable-libfribidi
--disable-indev=sndio --disable-outdev=sndio --cc=gcc
libavutil 55. 7.100 / 55. 7.100
libavcodec 57. 15.100 / 57. 15.100
libavformat 57. 16.100 / 57. 16.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 15.100 / 6. 15.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, matroska,webm, from 'b.webm':
Metadata:
encoder : GStreamer matroskamux version 1.5.91
creation_time : 2015-11-23 19:54:12
Duration: 00:00:21.59, start: 0.000000, bitrate: 408 kb/s
Stream #0:0(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 15
tbr, 1k tbn, 1k tbc (default)
Metadata:
title : Video
Stream #0:1(eng): Audio: vorbis, 48000 Hz, stereo, fltp (default)
Metadata:
title : Audio
FFMPEG Output:
------------------------
ffmpeg version N-51228-g8eadabf-static http://johnvansickle.com/ffmpeg/
Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 5.2.1 (Debian 5.2.1-23) 20151028
configuration: --enable-gpl --enable-version3 --disable-shared
--disable-debug --enable-runtime-cpudetect --enable-libmp3lame
--enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex
--enable-libvorbis --enable-libvpx --enable-libfreetype
--enable-fontconfig --enable-libxvid --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg
--enable-libopus --enable-libass --enable-gnutls --enable-libvidstab
--enable-libsoxr --enable-frei0r --enable-libfribidi
--disable-indev=sndio --disable-outdev=sndio --cc=gcc
libavutil 55. 7.100 / 55. 7.100
libavcodec 57. 15.100 / 57. 15.100
libavformat 57. 16.100 / 57. 16.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 15.100 / 6. 15.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, matroska,webm, from 'a.webm':
Metadata:
encoder : GStreamer matroskamux version 1.5.91
creation_time : 2015-11-23 19:54:12
Duration: 00:00:21.81, start: 0.000000, bitrate: 398 kb/s
Stream #0:0(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3,
29.67 tbr, 1k tbn, 1k tbc (default)
Metadata:
title : Video
Stream #0:1(eng): Audio: vorbis, 48000 Hz, stereo, fltp (default)
Metadata:
title : Audio
[libvpx-vp9 @ 0xb689d80] v1.4.0-1490-g0134764
[libopus @ 0xb6523a0] No bit rate set. Defaulting to 96000 bps.
Output #0, webm, to 'c.webm':
Metadata:
encoder : Lavf57.16.100
Stream #0:0(eng): Video: vp9 (libvpx-vp9), yuv420p, 1280x480 [SAR
1:1 DAR 8:3], q=-1--1, 200 kb/s, 29.67 fps, 1k tbn, 29.67 tbc (default)
Metadata:
title : Video
encoder : Lavc57.15.100 libvpx-vp9
Stream #0:1(eng): Audio: opus (libopus), 48000 Hz, stereo, flt, 96
kb/s (default)
Metadata:
title : Audio
encoder : Lavc57.15.100 libopus
Stream mapping:
Stream #0:0 -> #0:0 (vp8 (native) -> vp9 (libvpx-vp9))
Stream #0:1 -> #0:1 (vorbis (native) -> opus (libopus))
Press [q] to stop, [?] for help
Input stream #0:0 frame changed from size:640x480 fmt:yuv420p to
size:480x360 fmt:yuv420p
Input stream #0:0 frame changed from size:480x360 fmt:yuv420p to
size:320x240 fmt:yuv420p
Past duration 0.619331 too large 342kB time=00:00:11.82 bitrate=
237.1kbits/s
Past duration 0.631660 too large 349kB time=00:00:11.98 bitrate=
238.7kbits/s
Past duration 0.604332 too large 359kB time=00:00:12.30 bitrate=
239.0kbits/s
Past duration 0.648659 too large 373kB time=00:00:12.74 bitrate=
239.9kbits/s
Past duration 0.639992 too large
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239.3kbits/s
Past duration 0.633659 too large 386kB time=00:00:13.14 bitrate=
240.3kbits/s
Past duration 0.684319 too large 387kB time=00:00:13.18 bitrate=
240.2kbits/s
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241.7kbits/s
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241.2kbits/s
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243.9kbits/s
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242.4kbits/s
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243.7kbits/s
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243.8kbits/s
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247.1kbits/s
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246.2kbits/s
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245.4kbits/s
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247.6kbits/s
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246.9kbits/s
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246.9kbits/s
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250.2kbits/s
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249.5kbits/s
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248.7kbits/s
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250.1kbits/s
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249.4kbits/s
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248.9kbits/s
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250.0kbits/s
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249.4kbits/s
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248.9kbits/s
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250.3kbits/s
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249.9kbits/s
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249.1kbits/s
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250.9kbits/s
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250.7kbits/s
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249.9kbits/s
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251.3kbits/s
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251.0kbits/s
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250.5kbits/s
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252.2kbits/s
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252.3kbits/s
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250.7kbits/s
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252.3kbits/s
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251.9kbits/s
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251.0kbits/s
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252.6kbits/s
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252.4kbits/s
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250.9kbits/s
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251.6kbits/s
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252.6kbits/s
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251.6kbits/s
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253.8kbits/s
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253.2kbits/s
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252.6kbits/s
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Past duration 0.831657 too large 576kB time=00:00:18.56 bitrate=
254.0kbits/s
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Past duration 0.754997 too large 577kB time=00:00:18.64 bitrate=
253.5kbits/s
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252.3kbits/s
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252.2kbits/s
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253.1kbits/s
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252.5kbits/s
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251.6kbits/s
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250.6kbits/s
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252.6kbits/s
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252.1kbits/s
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251.2kbits/s
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252.9kbits/s
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252.1kbits/s
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251.9kbits/s
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251.0kbits/s
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252.1kbits/s
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251.1kbits/s
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250.7kbits/s
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250.2kbits/s
Past duration 0.824654 too large 627kB time=00:00:20.56 bitrate=
249.8kbits/s
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250.8kbits/s
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249.4kbits/s
Past duration 0.818321 too large
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Past duration 0.923332 too large 645kB time=00:00:21.12 bitrate=
250.2kbits/s
frame= 637 fps=5.1 q=0.0 Lsize= 694kB time=00:00:21.80 bitrate=
260.6kbits/s
video:504kB audio:177kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 1.809044%
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