(merging into mkv) Unrecognized option 'disposition:s'.

[mrkapqa]

Hello ,

i don't know if this is an ffmpeg or youtube-dl issue.

on debian wheezy 64bit
using youtube-dl and youtube-viewer to download / file

getting error

3.96 MB received in 22 seconds (184 KB/sec)
4.02 MB received in 28 seconds (147 KB/sec)
:: Merging into MKV...
Unrecognized option 'disposition:s'.
Error splitting the argument list: Option not found

---

youtube-dl --version
2020.01.24

ffmpeg -version
ffmpeg version 2.1.8
built on Jul 23 2019 18:34:53 with gcc 4.7 (Debian 4.7.2-5)
configuration: --prefix=/home/rich/ffmpeg_build --extra-cflags=-I/home/rich/ffmpeg_build/include --extra-ldflags=-L/home/rich/ffmpeg_build/lib --bindir=/home/rich/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
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
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100

[mrkapqa]

thank you, please let me know what i am missing.

[dstftw]

Bother to read issue template.