[Libav-user] Unknown decoder 'copy' = avcodec_find_decoder_by_name("copy") returning 0 on iOS

[Alex Cohn]

On Thu, May 10, 2012 at 6:18 PM, Wagner Patriota
<wagner.patriota at gmail.com> wrote:
> sorry, I forgot something... the equivalent ffmpeg command is:
>
> ffmpeg -i input.mp4 -acodec copy output.ts
>
>
> On Thu, May 10, 2012 at 11:47 AM, Wagner Patriota
> <wagner.patriota at gmail.com> wrote:
>>
>> Hello... I compiled for iOS with the following parameters:
>>
>> [in this case, for simulator]
>> ./configure \
>>
>> --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc
>> \
>> --as='/usr/local/bin/gas-preprocessor.pl
>> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc'
>> \
>>
>> --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk
>> \
>> --target-os=darwin \
>> --arch=i386 \
>> --cpu=i386 \
>> --extra-cflags='-arch i386' \
>> --extra-ldflags='-arch i386 -isysroot
>> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk'
>> \
>> --prefix=compiled/i386 \
>> --enable-cross-compile \
>> --enable-nonfree \
>> --enable-gpl \
>> --enable-postproc \
>> --enable-avfilter \
>> --disable-armv5te \
>> --disable-ffplay \
>> --disable-ffserver \
>> --disable-ffprobe \
>> --disable-doc \
>> --disable-debug \
>> --disable-neon \
>> --disable-pic \
>> --disable-asm
>>
>>
>> when I get to avcodec_find_decoder_by_name("copy") ... it returns 0...
>>
>> I am doing the equivalent of doing "ffmpeg -i input.mp4 output.ts"
>>
>> any ideia of what is happening?

"copy" is a placeholder for not running codec at all. In your program
that implements this logic, you should "short-circuit" the demuxer and
the muxer. Note that in some cases, you cannot avoid running the video
codec, because it is the way to extract global headers, etc.

BR,
Alex Cohn