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when executing ffmpeg -i myfile.avi -vcodec copy -acodec copy -pix_fmt yuv420p myfile.mp4.

Using the proposed ffmpeg -i file:myfile.avi -vcodec copy -acodec copy -pix_fmt yuv420p myfile.mp4 then results in

Executing the same command (out of bash history, so no typos) after a reboot (normally I just go into pm-suspend-hybrid) works normally, converting from .avi to .mp4 like can be expected.

FTR: complete input/output:

Mulvya asked for following output:

$ ffmpeg -protocols -v 0
Supported file protocols:
Input:
  async
  bluray
  cache
  concat
  crypto
  data
  ffrtmpcrypt
  ffrtmphttp
  file
  ftp
  gopher
  hls
  http
  httpproxy
  https
  mmsh
  mmst
  pipe
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  rtmpts
  rtp
  sctp
  srtp
  subfile
  tcp
  tls
  udp
  udplite
  unix
Output:
  crypto
  ffrtmpcrypt
  ffrtmphttp
  file
  ftp
  gopher
  http
  httpproxy
  https
  icecast
  md5
  pipe
  prompeg
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  rtmpts
  rtp
  sctp
  srtp
  tee
  tcp
  tls
  udp
  udplite
  unix

if executing ffmpeg -i myfile.avi -vcodec copy -acodec copy -pix_fmt yuv420p myfile.mp4.

Using ffmpeg -i file:myfile.avi -vcodec copy -acodec copy -pix_fmt yuv420p myfile.mp4 then fails:

Executing the same (out of bash history) after reboot (normally I just go into pm-suspend-hybrid) works, converting from .avi to .mp4 like expected.

complete in-/output:

Mulvya asked for following:

$ ffmpeg -protocols -v 0
Supported file protocols:
Input:
  async
  bluray
  cache
  concat
  crypto
  data
  ffrtmpcrypt
  ffrtmphttp
  file
  ftp
  gopher
  hls
  http
  httpproxy
  https
  mmsh
  mmst
  pipe
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  rtmpts
  rtp
  sctp
  srtp
  subfile
  tcp
  tls
  udp
  udplite
  unix
Output:
  crypto
  ffrtmpcrypt
  ffrtmphttp
  file
  ftp
  gopher
  http
  httpproxy
  https
  icecast
  md5
  pipe
  prompeg
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  rtmpts
  rtp
  sctp
  srtp
  tee
  tcp
  tls
  udp
  udplite
  unix

Comparing the ldd output (suggested by andcoz) gives a difference of

$ diff ldd-not-working-libs-only ldd-working-libs-only
2d1
<   /usr/lib/chromium-browser/libffmpeg.so 
16d14
<   librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 
88a87
>   librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 

Full output:

$ cat ldd-not-working
    linux-vdso.so.1 (0x00007fff303e5000)
    /usr/lib/chromium-browser/libffmpeg.so (0x00007f8fb7d89000)
    libavdevice.so.57 => /usr/lib/x86_64-linux-gnu/libavdevice.so.57 (0x00007f8fb7b5b000)
    libavfilter.so.6 => /usr/lib/x86_64-linux-gnu/libavfilter.so.6 (0x00007f8fb76da000)
    libavformat.so.57 => /usr/lib/x86_64-linux-gnu/libavformat.so.57 (0x00007f8fb7295000)
    libavcodec.so.57 => /usr/lib/x86_64-linux-gnu/libavcodec.so.57 (0x00007f8fb5b6e000)
    libavresample.so.3 => /usr/lib/x86_64-linux-gnu/libavresample.so.3 (0x00007f8fb594c000)
    libpostproc.so.54 => /usr/lib/x86_64-linux-gnu/libpostproc.so.54 (0x00007f8fb572e000)
    libswresample.so.2 => /usr/lib/x86_64-linux-gnu/libswresample.so.2 (0x00007f8fb550f000)
    libswscale.so.4 => /usr/lib/x86_64-linux-gnu/libswscale.so.4 (0x00007f8fb527e000)
    libavutil.so.55 => /usr/lib/x86_64-linux-gnu/libavutil.so.55 (0x00007f8fb4ff5000)
    libva.so.1 => /usr/lib/x86_64-linux-gnu/libva.so.1 (0x00007f8fb4dd5000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8fb4ad1000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f8fb48b4000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8fb4515000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f8fb430d000)
    libXv.so.1 => /usr/lib/x86_64-linux-gnu/libXv.so.1 (0x00007f8fb4108000)
    libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f8fb3dc8000)
    libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f8fb3bb6000)
    libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f8fb398e000)
    libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f8fb378a000)
    libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f8fb3582000)
    libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f8fb337e000)
    libcdio_paranoia.so.1 => /usr/lib/x86_64-linux-gnu/libcdio_paranoia.so.1 (0x00007f8fb3176000)
    libcdio_cdda.so.1 => /usr/lib/x86_64-linux-gnu/libcdio_cdda.so.1 (0x00007f8fb2f6e000)
    libsndio.so.6.1 => /usr/lib/x86_64-linux-gnu/libsndio.so.6.1 (0x00007f8fb2d5e000)
    libjack.so.0 => /usr/lib/x86_64-linux-gnu/libjack.so.0 (0x00007f8fb2b17000)
    libasound.so.2 => /usr/lib/x86_64-linux-gnu/libasound.so.2 (0x00007f8fb280a000)
    libSDL2-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0 (0x00007f8fb24ee000)
    libdc1394.so.22 => /usr/lib/x86_64-linux-gnu/libdc1394.so.22 (0x00007f8fb2277000)
    libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f8fb2005000)
    libpulse.so.0 => /usr/lib/x86_64-linux-gnu/libpulse.so.0 (0x00007f8fb1db4000)
    libcaca.so.0 => /usr/lib/x86_64-linux-gnu/libcaca.so.0 (0x00007f8fb1aeb000)
    libraw1394.so.11 => /usr/lib/x86_64-linux-gnu/libraw1394.so.11 (0x00007f8fb18db000)
    libavc1394.so.0 => /usr/lib/x86_64-linux-gnu/libavc1394.so.0 (0x00007f8fb16d6000)
    librom1394.so.0 => /usr/lib/x86_64-linux-gnu/librom1394.so.0 (0x00007f8fb14d1000)
    libiec61883.so.0 => /usr/lib/x86_64-linux-gnu/libiec61883.so.0 (0x00007f8fb12c4000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f8fb10c0000)
    libvidstab.so.1.0 => /usr/lib/libvidstab.so.1.0 (0x00007f8fb0eab000)
    libtesseract.so.3 => /usr/lib/x86_64-linux-gnu/libtesseract.so.3 (0x00007f8fb0708000)
    librubberband.so.2 => /usr/lib/x86_64-linux-gnu/librubberband.so.2 (0x00007f8fb04d2000)
    libmfx.so.0 => /usr/lib/x86_64-linux-gnu/libmfx.so.0 (0x00007f8fb02be000)
    libfribidi.so.0 => /usr/lib/x86_64-linux-gnu/libfribidi.so.0 (0x00007f8fb00a7000)
    libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f8fafdf8000)
    libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f8fafbba000)
    libbs2b.so.0 => /usr/lib/x86_64-linux-gnu/libbs2b.so.0 (0x00007f8faf9b4000)
    libass.so.9 => /usr/lib/x86_64-linux-gnu/libass.so.9 (0x00007f8faf783000)
    libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f8faf474000)
    libopenmpt.so.0 => /usr/lib/x86_64-linux-gnu/libopenmpt.so.0 (0x00007f8faf0e5000)
    libgme.so.0 => /usr/lib/x86_64-linux-gnu/libgme.so.0 (0x00007f8faee98000)
    libbluray.so.2 => /usr/lib/x86_64-linux-gnu/libbluray.so.2 (0x00007f8faec4b000)
    libgnutls.so.30 => /usr/lib/x86_64-linux-gnu/libgnutls.so.30 (0x00007f8fae8b2000)
    libchromaprint.so.1 => /usr/lib/x86_64-linux-gnu/libchromaprint.so.1 (0x00007f8fae69a000)
    libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0 (0x00007f8fae48a000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f8fae270000)
    libzvbi.so.0 => /usr/lib/x86_64-linux-gnu/libzvbi.so.0 (0x00007f8fadfe3000)
    libxvidcore.so.4 => /usr/lib/x86_64-linux-gnu/libxvidcore.so.4 (0x00007f8fadccf000)
    libx265.so.116 => /usr/lib/x86_64-linux-gnu/libx265.so.116 (0x00007f8fad649000)
    libx264.so.150 => /usr/lib/x86_64-linux-gnu/libx264.so.150 (0x00007f8fad2ce000)
    libvpx.so.4 => /usr/lib/x86_64-linux-gnu/libvpx.so.4 (0x00007f8face91000)
    libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 (0x00007f8facbe8000)
    libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 (0x00007f8fac9bc000)
    libvo-amrwbenc.so.0 => /usr/lib/x86_64-linux-gnu/libvo-amrwbenc.so.0 (0x00007f8fac7a2000)
    libtheoraenc.so.1 => /usr/lib/x86_64-linux-gnu/libtheoraenc.so.1 (0x00007f8fac563000)
    libtheoradec.so.1 => /usr/lib/x86_64-linux-gnu/libtheoradec.so.1 (0x00007f8fac345000)
    libspeex.so.1 => /usr/lib/x86_64-linux-gnu/libspeex.so.1 (0x00007f8fac12c000)
    libsnappy.so.1 => /usr/lib/x86_64-linux-gnu/libsnappy.so.1 (0x00007f8fabf24000)
    libshine.so.3 => /usr/lib/x86_64-linux-gnu/libshine.so.3 (0x00007f8fabd17000)
    libopus.so.0 => /usr/lib/x86_64-linux-gnu/libopus.so.0 (0x00007f8fabac8000)
    libopenjp2.so.7 => /usr/lib/x86_64-linux-gnu/libopenjp2.so.7 (0x00007f8fab88d000)
    libopenh264.so.2 => /usr/lib/x86_64-linux-gnu/libopenh264.so.2 (0x00007f8fab598000)
    libopencore-amrwb.so.0 => /usr/lib/x86_64-linux-gnu/libopencore-amrwb.so.0 (0x00007f8fab384000)
    libopencore-amrnb.so.0 => /usr/lib/x86_64-linux-gnu/libopencore-amrnb.so.0 (0x00007f8fab15a000)
    libmp3lame.so.0 => /usr/lib/x86_64-linux-gnu/libmp3lame.so.0 (0x00007f8faaec3000)
    libkvazaar.so.3 => /usr/lib/x86_64-linux-gnu/libkvazaar.so.3 (0x00007f8faac3d000)
    libilbc.so.2 => /usr/lib/x86_64-linux-gnu/libilbc.so.2 (0x00007f8faaa26000)
    libgsm.so.1 => /usr/lib/x86_64-linux-gnu/libgsm.so.1 (0x00007f8faa819000)
    libfdk-aac.so.1 => /usr/lib/x86_64-linux-gnu/libfdk-aac.so.1 (0x00007f8faa561000)
    libcrystalhd.so.3 => /usr/lib/x86_64-linux-gnu/libcrystalhd.so.3 (0x00007f8faa346000)
    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f8faa120000)
    libsoxr.so.0 => /usr/lib/x86_64-linux-gnu/libsoxr.so.0 (0x00007f8fa9ebd000)
    libvdpau.so.1 => /usr/lib/x86_64-linux-gnu/libvdpau.so.1 (0x00007f8fa9cb9000)
    libva-x11.so.1 => /usr/lib/x86_64-linux-gnu/libva-x11.so.1 (0x00007f8fa9ab3000)
    libva-drm.so.1 => /usr/lib/x86_64-linux-gnu/libva-drm.so.1 (0x00007f8fa98b0000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f8fb861a000)
    libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f8fa96ac000)
    libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f8fa94a6000)
    libcdio.so.13 => /usr/lib/x86_64-linux-gnu/libcdio.so.13 (0x00007f8fa9281000)
    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f8fa906b000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f8fa8ce9000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8fa8ad2000)
    libpulse-simple.so.0 => /usr/lib/x86_64-linux-gnu/libpulse-simple.so.0 (0x00007f8fa88cd000)
    libXcursor.so.1 => /usr/lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007f8fa86c2000)
    libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007f8fa84bf000)
    libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007f8fa82af000)
    libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f8fa80a4000)
    libXss.so.1 => /usr/lib/x86_64-linux-gnu/libXss.so.1 (0x00007f8fa7ea1000)
    libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007f8fa7c9b000)
    libwayland-egl.so.1 => /usr/lib/x86_64-linux-gnu/libwayland-egl.so.1 (0x00007f8fa7a99000)
    libwayland-client.so.0 => /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 (0x00007f8fa788a000)
    libwayland-cursor.so.0 => /usr/lib/x86_64-linux-gnu/libwayland-cursor.so.0 (0x00007f8fa7682000)
    libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f8fa7442000)
    libusb-1.0.so.0 => /lib/x86_64-linux-gnu/libusb-1.0.so.0 (0x00007f8fa7229000)
    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f8fa6fff000)
    libxcb-dri3.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri3.so.0 (0x00007f8fa6dfc000)
    libxcb-present.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-present.so.0 (0x00007f8fa6bf9000)
    libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f8fa69f2000)
    libxshmfence.so.1 => /usr/lib/x86_64-linux-gnu/libxshmfence.so.1 (0x00007f8fa67f0000)
    libglapi.so.0 => /usr/lib/x86_64-linux-gnu/libglapi.so.0 (0x00007f8fa65c1000)
    libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007f8fa63be000)
    libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f8fa61b8000)
    libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f8fa5fb6000)
    libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007f8fa5d9b000)
    libxcb-dri2.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0 (0x00007f8fa5b96000)
    libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007f8fa5986000)
    libpulsecommon-10.0.so => /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-10.0.so (0x00007f8fa5703000)
    libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f8fa54b3000)
    libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007f8fa52ad000)
    libslang.so.2 => /lib/x86_64-linux-gnu/libslang.so.2 (0x00007f8fa4dc5000)
    libncursesw.so.5 => /lib/x86_64-linux-gnu/libncursesw.so.5 (0x00007f8fa4b95000)
    libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007f8fa496b000)
    liblept.so.5 => /usr/lib/x86_64-linux-gnu/liblept.so.5 (0x00007f8fa44fb000)
    libsamplerate.so.0 => /usr/lib/x86_64-linux-gnu/libsamplerate.so.0 (0x00007f8fa418f000)
    libfftw3.so.3 => /usr/lib/x86_64-linux-gnu/libfftw3.so.3 (0x00007f8fa3d92000)
    libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f8fa3b5f000)
    libharfbuzz.so.0 => /usr/lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007f8fa38ca000)
    libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f8fa36b6000)
    libmpg123.so.0 => /usr/lib/x86_64-linux-gnu/libmpg123.so.0 (0x00007f8fa3457000)
    libvorbisfile.so.3 => /usr/lib/x86_64-linux-gnu/libvorbisfile.so.3 (0x00007f8fa324e000)
    libxml2.so.2 => /usr/lib/x86_64-linux-gnu/libxml2.so.2 (0x00007f8fa2ee7000)
    libp11-kit.so.0 => /usr/lib/x86_64-linux-gnu/libp11-kit.so.0 (0x00007f8fa2c82000)
    libidn.so.11 => /lib/x86_64-linux-gnu/libidn.so.11 (0x00007f8fa2a4e000)
    libtasn1.so.6 => /usr/lib/x86_64-linux-gnu/libtasn1.so.6 (0x00007f8fa283b000)
    libnettle.so.6 => /usr/lib/x86_64-linux-gnu/libnettle.so.6 (0x00007f8fa2604000)
    libhogweed.so.4 => /usr/lib/x86_64-linux-gnu/libhogweed.so.4 (0x00007f8fa23cf000)
    libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10 (0x00007f8fa214c000)
    libnuma.so.1 => /usr/lib/x86_64-linux-gnu/libnuma.so.1 (0x00007f8fa1f41000)
    libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 (0x00007f8fa1d38000)
    libcairo.so.2 => /usr/lib/x86_64-linux-gnu/libcairo.so.2 (0x00007f8fa1a24000)
    libgomp.so.1 => /usr/lib/x86_64-linux-gnu/libgomp.so.1 (0x00007f8fa17f7000)
    libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f8fa15ed000)
    libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f8fa13e4000)
    libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 (0x00007f8fb87a0000)
    libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 (0x00007f8fa11c7000)
    libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x00007f8fa0fbf000)
    libXtst.so.6 => /usr/lib/x86_64-linux-gnu/libXtst.so.6 (0x00007f8fa0db9000)
    libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f8fb8714000)
    libwrap.so.0 => /lib/x86_64-linux-gnu/libwrap.so.0 (0x00007f8fa0baf000)
    libsndfile.so.1 => /usr/lib/x86_64-linux-gnu/libsndfile.so.1 (0x00007f8fa0937000)
    libasyncns.so.0 => /usr/lib/x86_64-linux-gnu/libasyncns.so.0 (0x00007f8fa0731000)
    libjpeg.so.62 => /usr/lib/x86_64-linux-gnu/libjpeg.so.62 (0x00007f8fa04c6000)
    libgif.so.7 => /usr/lib/x86_64-linux-gnu/libgif.so.7 (0x00007f8fa02bc000)
    libtiff.so.5 => /usr/lib/x86_64-linux-gnu/libtiff.so.5 (0x00007f8fa0045000)
    libwebp.so.6 => /usr/lib/x86_64-linux-gnu/libwebp.so.6 (0x00007f8f9fde4000)
    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f8f9fad0000)
    libgraphite2.so.3 => /usr/lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007f8f9f8a3000)
    libpixman-1.so.0 => /usr/lib/x86_64-linux-gnu/libpixman-1.so.0 (0x00007f8f9f5fc000)
    libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f8f9f3ee000)
    libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f8f9f1e9000)
    libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f8f9efc1000)
    liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f8f9edaf000)
    libnsl.so.1 => /lib/x86_64-linux-gnu/libnsl.so.1 (0x00007f8f9eb97000)
    libFLAC.so.8 => /usr/lib/x86_64-linux-gnu/libFLAC.so.8 (0x00007f8f9e920000)
    libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f8f9e709000)
    libjbig.so.0 => /usr/lib/x86_64-linux-gnu/libjbig.so.0 (0x00007f8f9e4fb000)
    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f8f9e288000)

Mulvya asked for following output:

$ ffmpeg -protocols -v 0
Supported file protocols:
Input:
  async
  bluray
  cache
  concat
  crypto
  data
  ffrtmpcrypt
  ffrtmphttp
  file
  ftp
  gopher
  hls
  http
  httpproxy
  https
  mmsh
  mmst
  pipe
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  rtmpts
  rtp
  sctp
  srtp
  subfile
  tcp
  tls
  udp
  udplite
  unix
Output:
  crypto
  ffrtmpcrypt
  ffrtmphttp
  file
  ftp
  gopher
  http
  httpproxy
  https
  icecast
  md5
  pipe
  prompeg
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  rtmpts
  rtp
  sctp
  srtp
  tee
  tcp
  tls
  udp
  udplite
  unix

FTR: complete input/output:

$ ffmpeg -i myfile.avi -vcodec copy -acodec copy -pix_fmt yuv420p myfile.mp4
ffmpeg version 3.2.9-1~deb9u1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avutil      configuration: --disable-everything --disable-all --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --enable-avcodec --enable-avformat --enable-avutil --enable-fft --enable-rdft --enable-static --enable-libopus --disable-bzlib --disable-error-resilience --disable-iconv --disable-lzo --disable-network --disable-schannel --disable-sdl --disable-symver --disable-xlib --disable-zlib --disable-securetransport --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --disable-videotoolbox --disable-nvenc --enable-decoder='vorbis,libopus,flac' --enable-decoder='pcm_u8,pcm_s16le,pcm_s24le,pcm_s32le,pcm_f32le' --enable-decoder='pcm_s16be,pcm_s24be,pcm_mulaw,pcm_alaw' --enable-demuxer='ogg,matroska,wav,flac' --enable-parser='opus,vorbis,flac' --extra-cflags=-I/ssd/trunk_blink_tot/src/third_party/opus/src/include --optflags='"-O2"' --enable-decoder='theora,vp8' --enable-parser='vp3,vp8' --enable-pic --enable-decoder='aac,h264,mp3' --enable-demuxer='aac,mp3,mov' --enable-parser='aac,h264,mpegaudio' --enable-lto
  avcodec     configuration: --disable-everything --disable-all --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --enable-avcodec --enable-avformat --enable-avutil --enable-fft --enable-rdft --enable-static --enable-libopus --disable-bzlib --disable-error-resilience --disable-iconv --disable-lzo --disable-network --disable-schannel --disable-sdl --disable-symver --disable-xlib --disable-zlib --disable-securetransport --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --disable-videotoolbox --disable-nvenc --enable-decoder='vorbis,libopus,flac' --enable-decoder='pcm_u8,pcm_s16le,pcm_s24le,pcm_s32le,pcm_f32le' --enable-decoder='pcm_s16be,pcm_s24be,pcm_mulaw,pcm_alaw' --enable-demuxer='ogg,matroska,wav,flac' --enable-parser='opus,vorbis,flac' --extra-cflags=-I/ssd/trunk_blink_tot/src/third_party/opus/src/include --optflags='"-O2"' --enable-decoder='theora,vp8' --enable-parser='vp3,vp8' --enable-pic --enable-decoder='aac,h264,mp3' --enable-demuxer='aac,mp3,mov' --enable-parser='aac,h264,mpegaudio' --enable-lto
  avformat    configuration: --disable-everything --disable-all --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --enable-avcodec --enable-avformat --enable-avutil --enable-fft --enable-rdft --enable-static --enable-libopus --disable-bzlib --disable-error-resilience --disable-iconv --disable-lzo --disable-network --disable-schannel --disable-sdl --disable-symver --disable-xlib --disable-zlib --disable-securetransport --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --disable-videotoolbox --disable-nvenc --enable-decoder='vorbis,libopus,flac' --enable-decoder='pcm_u8,pcm_s16le,pcm_s24le,pcm_s32le,pcm_f32le' --enable-decoder='pcm_s16be,pcm_s24be,pcm_mulaw,pcm_alaw' --enable-demuxer='ogg,matroska,wav,flac' --enable-parser='opus,vorbis,flac' --extra-cflags=-I/ssd/trunk_blink_tot/src/third_party/opus/src/include --optflags='"-O2"' --enable-decoder='theora,vp8' --enable-parser='vp3,vp8' --enable-pic --enable-decoder='aac,h264,mp3' --enable-demuxer='aac,mp3,mov' --enable-parser='aac,h264,mpegaudio' --enable-lto
  avdevice    configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  avfilter    configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  avresample  configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  swscale     configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  swresample  configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  postproc    configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  libavutil      55. 34.101 / 55. 33.100
  libavcodec     57. 64.101 / 57. 63.103
  libavformat    57. 56.101 / 57. 55.100
  libavdevice    57.  1.100 / 57.  6.100
  libavfilter     6. 65.100 /  6. 82.100
  libavresample   3.  1.  0 /  3.  5.  0
  libswscale      4.  2.100 /  4.  6.100
  libswresample   2.  3.100 /  2.  7.100
  libpostproc    54.  1.100 / 54.  5.100
myfile.avi: Protocol not found
Did you mean file:myfile.avi?