unable to find a suitable output format for 'ffmpeg'

Question

I am using ffmpeg library for android.

I am passing one ffmpeg command for convert video format from .mp4 to .avi

ffmpeg -r 20 -i /storage/emulated/0/WisperMedia/WisperVideos/sample.mp4 -b:v 20M /storage/emulated/0/WisperMedia/WisperVideos/output.avi

But I am getting error like

    09-23 09:29:41.525: E/Home(31343): FAILED with output : ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
09-23 09:29:41.525: E/Home(31343):   built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
09-23 09:29:41.525: E/Home(31343):   configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
09-23 09:29:41.525: E/Home(31343):   libavutil      54.  7.100 / 54.  7.100
09-23 09:29:41.525: E/Home(31343):   libavcodec     56.  1.100 / 56.  1.100
09-23 09:29:41.525: E/Home(31343):   libavformat    56.  4.101 / 56.  4.101
09-23 09:29:41.525: E/Home(31343):   libavdevice    56.  0.100 / 56.  0.100
09-23 09:29:41.525: E/Home(31343):   libavfilter     5.  1.100 /  5.  1.100
09-23 09:29:41.525: E/Home(31343):   libswscale      3.  0.100 /  3.  0.100
09-23 09:29:41.525: E/Home(31343):   libswresample   1.  1.100 /  1.  1.100
09-23 09:29:41.525: E/Home(31343):   libpostproc    53.  0.100 / 53.  0.100
09-23 09:29:41.525: E/Home(31343): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/WisperMedia/WisperVideos/sample.mp4':
09-23 09:29:41.525: E/Home(31343):   Metadata:
09-23 09:29:41.525: E/Home(31343):     major_brand     : isom
09-23 09:29:41.525: E/Home(31343):     minor_version   : 0
09-23 09:29:41.525: E/Home(31343):     compatible_brands: isom3gp4
09-23 09:29:41.525: E/Home(31343):     creation_time   : 2015-09-23 03:50:16
09-23 09:29:41.525: E/Home(31343):   Duration: 00:00:01.56, start: 0.000000, bitrate: 14737 kb/s
09-23 09:29:41.525: E/Home(31343):     Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 11819 kb/s, SAR 65536:65536 DAR 16:9, 29.79 fps, 29.92 tbr, 90k tbn, 180k tbc (default)
09-23 09:29:41.525: E/Home(31343):     Metadata:
09-23 09:29:41.525: E/Home(31343):       rotate          : 90
09-23 09:29:41.525: E/Home(31343):       creation_time   : 2015-09-23 03:50:16
09-23 09:29:41.525: E/Home(31343):       handler_name    : VideoHandle
09-23 09:29:41.525: E/Home(31343):     Side data:
09-23 09:29:41.525: E/Home(31343):       displaymatrix: rotation of -90.00 degrees
09-23 09:29:41.525: E/Home(31343):     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 128 kb/s (default)
09-23 09:29:41.525: E/Home(31343):     Metadata:
09-23 09:29:41.525: E/Home(31343):       creation_time   : 2015-09-23 03:50:16
09-23 09:29:41.525: E/Home(31343):       handler_name    : SoundHandle
09-23 09:29:41.525: E/Home(31343): [NULL @ 0x41f7f420] Unable to find a suitable output format for 'ffmpeg'
09-23 09:29:41.525: E/Home(31343): ffmpeg: Invalid argument

Solution 1

These kind of errors are usually caused by unintended leading or trailing arguments in the ffmpeg command. If you are using a third-party library that acts as a wrapper to ffmpeg you must check its documentation and output since it may automatically add arguments (like the path to the ffmpeg binary for example).

In this particular case ffmpeg is seen as an unknown output. Some incorrect commands that could raise this error include:

• ffmpeg -i [input] -o [output] ffmpeg ...
• ffmpeg ffmpeg ...

Solution 2

Same error may suggest ffmpeg simply needs to be told what format to output with the -f flag, because it failed to deduce it from the output file extension.

ffmpeg -i audio.xxx -f flac audio.flac

Solution 3

In my case, command was sent to me by email.

In the following parameter, "-c:a", there was not a dash, but a windows character!

Comments

[aergistal]

Are you sure the output corresponds to the posted command? Because the log says it tries to read a PNG file: /storage/emulated/0/WisperMedia/WisperImages/Zq3vbi3ZY3ML.pn‌​g

[aergistal]

Are you by any chance passing multiple ffmpeg commands at once? This can only happen if you have a trailing ffmpeg on the initial command, ie: ffmpeg -i something -o something ffmpeg ...

[KDeogharkar]

you saved my life thank you so much @aergistal . your hint is very useful . actually in this ffmpeg library we dont have to add ffmpeg in command . it automatically adding ffmpeg in command so I have to pass command without ffmpeg. thank you . :)

[Bugs Happen]

This was the case for me. I am using nl.bravobit:android-ffmpeg:1.1.5 library and it was appending ffmpeg automatically.