Csdrhrt

I'm trying to use the -headers command in ffmpeg, but with the following command I'm getting a No trailing CRLF found in HTTP header error.

ffmpeg -headers "$(printf 'n%sn%sn%sn%sn%sn%snn' 'Cookie: GPS=1; PREF=f1=50000000&hl=en; VISITOR_INFO1_LIVE=YYVg5wZlZM4; YSC=nqFTzbjynHk; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==' 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0' 'Accept-Encoding: gzip, deflate' 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' 'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7' 'Accept-Language: en-us,en;q=0.5')" -i http://localhost:8000 -v trace

This is the ffmpeg -v output (Note I've also tried with rn, \r\n, \n as well instead of just n still get the same error (the double incase of printf escape)

ffmpeg -headers "$(printf 'n%sn%sn%sn%sn%sn%snn' 'Cookie: GPS=1; PREF=f1=50000000&hl=en; VISITOR_INFO1_LIVE=YYVg5wZlZM4; YSC=nqFTzbjynHk; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==' 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0' 'Accept-Encoding: gzip, deflate' 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' 'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7' 'Accept-Language: en-us,en;q=0.5')" -i http://localhost:8000 -v trace

ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers

  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)

  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --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-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared

  libavutil      55. 78.100 / 55. 78.100

  libavcodec     57.107.100 / 57.107.100

  libavformat    57. 83.100 / 57. 83.100

  libavdevice    57. 10.100 / 57. 10.100

  libavfilter     6.107.100 /  6.107.100

  libavresample   3.  7.  0 /  3.  7.  0

  libswscale      4.  8.100 /  4.  8.100

  libswresample   2.  9.100 /  2.  9.100

  libpostproc    54.  7.100 / 54.  7.100

Splitting the commandline.

Reading option '-headers' ... matched as AVOption 'headers' with argument '

Cookie: GPS=1; PREF=f1=50000000&hl=en; VISITOR_INFO1_LIVE=YYVg5wZlZM4; YSC=nqFTzbjynHk; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0

Accept-Encoding: gzip, deflate

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

Accept-Language: en-us,en;q=0.5'.

Reading option '-i' ... matched as input url with argument 'http://localhost:8000'.

Reading option '-v' ... matched as option 'v' (set logging level) with argument 'trace'.

Finished splitting the commandline.

Parsing a group of options: global .

Applying option v (set logging level) with argument trace.

Successfully parsed a group of options.

Parsing a group of options: input url http://localhost:8000.

Successfully parsed a group of options.

Opening an input file: http://localhost:8000.

[NULL @ 0x556cf5231a60] Opening 'http://localhost:8000' for reading

[http @ 0x556cf5232780] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'

[http @ 0x556cf5232780] No trailing CRLF found in HTTP header.

[http @ 0x556cf5232780] request: GET / HTTP/1.1

User-Agent: Lavf/57.83.100

Accept: */*

Range: bytes=0-

Connection: close

Host: localhost:8000

Icy-MetaData: 1



Cookie: GPS=1; PREF=f1=50000000&hl=en; VISITOR_INFO1_LIVE=YYVg5wZlZM4; YSC=nqFTzbjynHk; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0

Accept-Encoding: gzip, deflate

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

Accept-Language: en-us,en;q=0.5





[http @ 0x556cf5232780] header='HTTP/1.0 200 OK'

[http @ 0x556cf5232780] http_code=200

This comment is right:

It's a warning, not an error. ffmpeg appends the trailing CRLF on its own and proceeds.

My answer explains why the tool cannot "see" CRLF even if you use rn in printf. It's because of $(). POSIX specification says [emphasis mine]:

$(command)

[...]

The shell shall expand the command substitution by executing command in a subshell environment [...] and replacing the command substitution (the text of command plus the enclosing $() or backquotes) with the standard output of the command, removing sequences of one or more <newline> characters at the end of the substitution.

So there's no way to get a trailing n from $().

You can ask your shell to add trailing newlines, although not all shells support this. In Bash instead of

foo "$(printf 'n%srn' 'bar')"

use

foo "$(printf 'n%s' 'bar')"$'rn'

See How does the leading dollar sign affect single quotes in Bash?