combining 1 image + 1 audio using FFmpeg

Question

I want to combine an audio file and one image file into a video. Output will be in .webm format so I will be using libvpx. The video must have one frame with the best/lossless quality.

So far I have tried these, but I got bad results or no results at all:

1st command:

ffmpeg -i image.jpg -i audio.ogg -c:v copy -c:a copy outputvideo.webm

This is not working. It gives this error:

[webm @ 0000000002c7f8a0] Only VP8 or VP9 video and Vorbis or Opus audio and Web
VTT subtitles are supported for WebM.
...
Could not write header for output file #0 (incorrect codec parameters ?): Error
number -22 occurred

2nd command:

ffmpeg -i image.jpg -i audio.ogg -c:v libvpx -c:a copy outputvideo.webm

This produces poor quality, not acceptable for me.

3rd command:

ffmpeg -i image.jpg -i audio.ogg -c:v libvpx -crf 4 -c:a copy outputvideo.webm

So I added -crf 4 parameter. I expected that would produce visually lossless video. In fact, it has no effect at all. -crf 4 and -crf 63 produces same results.

Then I have tried the similar settings with the libvpx-vp9 codec, but no luck. Even the -lossless 1 parameter does nothing for improving quality.

Answer 1

1st command: jpg is not contains webm. http://en.wikipedia.org/wiki/WebM

2nd command: You can use -loop 1 in front of inputfile, and use -shortest behind inputfile.

ffmpeg -loop 1 -i image.jpg -i audio.ogg -shortest -c:v libvpx -c:a copy outputvideo.webm

If you want to set fps, use fps filter.

ffmpeg -loop 1 -i image.jpg -i audio.ogg -vf fps=10 -shortest -c:v libvpx -c:a copy outputvideo.webm

3rd command: You can use quality best. http://ffmpeg.org/ffmpeg-codecs.html#libvpx

ffmpeg -loop 1 -i image.jpg -i audio.ogg -shortest -c:v libvpx -quality best -c:a copy outputvideo.webm

Answer 2

I'm not sure if it's a bug, but using -qscale:v instead of -crf works for libvpx. Qscale works the opposite way to CRF, higher is larger / better quality. Try the second command with -qscale:v 10 instead of the -crf option.

Answer 3

You could try to get quality by manually setting video bitrate "-b:v 2000M"

As for FPS, seems like it doesn't affect size much. Experimented a bit with -b:v and framerates:

ffmpeg -loop 1 -i ./frames/0254.png -i camera-shutter-click-07.wav -r 10000 -pix_fmt yuv420p -shortest -vcodec libvpx -strict -2 -acodec vorbis  outputvideo6.webm

ffmpeg -loop 1 -i ./frames/0254.png -i camera-shutter-click-07.wav -pix_fmt yuv420p -shortest -vcodec libvpx -strict -2 -acodec vorbis  outputvideo5.webm

ffmpeg -loop 1 -i ./frames/0254.png -i camera-shutter-click-07.wav -r 10000 -pix_fmt yuv420p -shortest -b:v 2000M -vcodec libvpx -strict -2 -acodec vorbis  outputvideo7.webm

First two videos are 25fps and 10000fps but their filesizes are almost equal: 101.3 and 102.7kB But since in third bitrate is higher it's size 339.7kB

ffmpeg -i outputvideo5.webm -i outputvideo6.webm -i outputvideo7.webm
ffmpeg version 2.5.git Copyright (c) 2000-2015 the FFmpeg developers
  built on Jan 11 2015 19:12:34 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --prefix=/home/alexandrov/ffmpeg_build --extra-cflags=-I/home/alexandrov/ffmpeg_build/include --extra-ldflags=-L/home/alexandrov/ffmpeg_build/lib --bindir=/home/alexandrov/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      54. 16.100 / 54. 16.100
  libavcodec     56. 20.100 / 56. 20.100
  libavformat    56. 18.100 / 56. 18.100
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  7.100 /  5.  7.100
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, matroska,webm, from 'outputvideo5.webm':
  Metadata:
    encoder         : Lavf56.18.100
  Duration: 00:00:01.32, start: 0.000000, bitrate: 613 kb/s
    Stream #0:0: Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
Input #1, matroska,webm, from 'outputvideo6.webm':
  Metadata:
    encoder         : Lavf56.18.100
  Duration: 00:00:01.30, start: 0.000000, bitrate: 631 kb/s
    Stream #1:0: Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 10k fps, 25 tbr, 1k tbn, 1k tbc (default)
    Stream #1:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
Input #2, matroska,webm, from 'outputvideo7.webm':
  Metadata:
    encoder         : Lavf56.18.100
  Duration: 00:00:01.30, start: 0.000000, bitrate: 2088 kb/s
    Stream #2:0: Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 10k fps, 25 tbr, 1k tbn, 1k tbc (default)
    Stream #2:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)