[Libav-user] mp3 live stream to stdout

pablo platt pablo.platt at gmail.com
Mon Jun 24 00:34:48 CEST 2013 

Sometimes when I'm stopping the media server I suddenly see many packets in
the terminal.
It seems that ffmpeg is buffering the output and doesn't stream it.



On Mon, Jun 24, 2013 at 1:22 AM, pablo platt <pablo.platt at gmail.com> wrote:

> When I'm trying to output to a file it gets stuck at
> [rtmp @ 0xb481460] New incoming chunk size = 4096
> and when I stop rtmplite I'm getting the rest.
>
> ./ffmpeg -loglevel debug -i rtmp://127.0.0.1/audio/test -f mp3 test.mp3
>
> ffmpeg version N-54023-g6fe419b Copyright (c) 2000-2013 the FFmpeg
> developers
>   built on Jun 14 2013 05:12:40 with gcc 4.6 (Debian 4.6.3-1)
>   configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32
> --extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static'
> --extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static'
> --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared
> --disable-ffserver --disable-doc --enable-bzlib --enable-zlib
> --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl
> --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray
> --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex
> --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3
> --enable-libvpx
>   libavutil      52. 35.101 / 52. 35.101
>   libavcodec     55. 16.100 / 55. 16.100
>   libavformat    55.  8.102 / 55.  8.102
>   libavdevice    55.  2.100 / 55.  2.100
>   libavfilter     3. 77.101 /  3. 77.101
>   libswscale      2.  3.100 /  2.  3.100
>   libswresample   0. 17.102 /  0. 17.102
>   libpostproc    52.  3.100 / 52.  3.100
> Splitting the commandline.
> Reading option '-loglevel' ... matched as option 'loglevel' (set logging
> level) with argument 'debug'.
> Reading option '-i' ... matched as input file with argument 'rtmp://
> 127.0.0.1/audio/test'.
> Reading option '-f' ... matched as option 'f' (force format) with argument
> 'mp3'.
> Reading option 'test.mp3' ... matched as output file.
>
> Finished splitting the commandline.
> Parsing a group of options: global .
> Applying option loglevel (set logging level) with argument debug.
> Successfully parsed a group of options.
> Parsing a group of options: input file rtmp://127.0.0.1/audio/test.
> Successfully parsed a group of options.
> Opening an input file: rtmp://127.0.0.1/audio/test.
> [rtmp @ 0xb481460] Handshaking...
> [rtmp @ 0xb481460] Type answer 3
> [rtmp @ 0xb481460] Server version 1.2.3.4
> [rtmp @ 0xb481460] Proto = rtmp, path = /audio/test, app = audio, fname =
> test
> [rtmp @ 0xb481460] Server bandwidth = 1073741824
> [rtmp @ 0xb481460] Creating stream...
> [rtmp @ 0xb481460] Sending play command for 'test'
> [rtmp @ 0xb481460] New incoming chunk size = 4096
> [flv @ 0xb480f40] Format flv probed with size=2048 and score=100
> [flv @ 0xb480f40] File position before avformat_find_stream_info() is 13
> [flv @ 0xb480f40] Could not find codec parameters for stream 0 (Video:
> none): unspecified size
> Consider increasing the value for the 'analyzeduration' and 'probesize'
> options
> [flv @ 0xb480f40] Could not find codec parameters for stream 1 (Audio:
> none, 0 channels): unspecified sample format
> Consider increasing the value for the 'analyzeduration' and 'probesize'
> options
> [flv @ 0xb480f40] File position after avformat_find_stream_info() is 13
> rtmp://127.0.0.1/audio/test: could not find codec parameters
> [AVIOContext @ 0xb481e00] Statistics: 13 bytes read, 0 seeks
> [rtmp @ 0xb481460] Deleting stream...
>
>
> On Mon, Jun 24, 2013 at 12:36 AM, pablo platt <pablo.platt at gmail.com>wrote:
>
>> Tested with ffmpeg.static.32bit.2013-06-14.tar.gz from http://ffmpeg.gusari.org/static/ under ubuntu 12.04 32bit.
>>
>> I'm using rtmplite with the test client.
>>
>> test:~/rtmplite$ python rtmp.py -d
>>
>> I'm Using the textClient that comes with rtmplite to create a video+audio stream:
>> test:~/rtmplite/testClient/bin-debug$ python -m SimpleHTTPServer
>>
>> I open the testClient example with Firefox in
>>
>> http://localhost:8000/testClient.html
>>
>> Result:
>>
>> ./ffmpeg -loglevel debug -i rtmp://127.0.0.1/audio/test -f mp3 pipe:1
>>
>> ffmpeg version N-54023-g6fe419b Copyright (c) 2000-2013 the FFmpeg developers
>>   built on Jun 14 2013 05:12:40 with gcc 4.6 (Debian 4.6.3-1)
>>   configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32 --extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static' --extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
>>
>>
>>   libavutil      52. 35.101 / 52. 35.101
>>   libavcodec     55. 16.100 / 55. 16.100
>>   libavformat    55.  8.102 / 55.  8.102
>>   libavdevice    55.  2.100 / 55.  2.100
>>
>>   libavfilter     3. 77.101 /  3. 77.101
>>   libswscale      2.  3.100 /  2.  3.100
>>
>>   libswresample   0. 17.102 /  0. 17.102
>>   libpostproc    52.  3.100 / 52.  3.100
>> Splitting the commandline.
>> Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
>>
>>
>> Reading option '-i' ... matched as input file with argument 'rtmp://127.0.0.1/audio/test'.
>> Reading option '-f' ... matched as option 'f' (force format) with argument 'mp3'.
>>
>>
>> Reading option 'pipe:1' ... matched as output file.
>> Finished splitting the commandline.
>> Parsing a group of options: global .
>> Applying option loglevel (set logging level) with argument debug.
>> Successfully parsed a group of options.
>>
>>
>> Parsing a group of options: input file rtmp://127.0.0.1/audio/test.
>> Successfully parsed a group of options.
>> Opening an input file: rtmp://127.0.0.1/audio/test.
>>
>>
>> [rtmp @ 0xa8a7460] Handshaking...
>> [rtmp @ 0xa8a7460] Type answer 3
>> [rtmp @ 0xa8a7460] Server version 1.2.3.4
>> [rtmp @ 0xa8a7460] Proto = rtmp, path = /audio/test, app = audio, fname = test
>> [rtmp @ 0xa8a7460] Server bandwidth = 1073741824
>>
>>
>> [rtmp @ 0xa8a7460] Creating stream...
>> [rtmp @ 0xa8a7460] Sending play command for 'test'
>> [rtmp @ 0xa8a7460] New incoming chunk size = 4096
>>
>>
>>
>> On Sun, Jun 23, 2013 at 8:31 PM, Paul B Mahol <onemda at gmail.com> wrote:
>>
>>> On 6/23/13, pablo platt <pablo.platt at gmail.com> wrote:
>>> > I'm using static builds from:
>>> > http://ffmpeg.gusari.org/static/
>>> >
>>> > I've tried:
>>> > ./ffmpeg -loglevel debug -i rtmp://127.0.0.1/audio/test -f mp3 -
>>> > and
>>> > ./ffmpeg -loglevel debug -i rtmp://127.0.0.1/audio/test -f mp3 pipe:1
>>> >
>>> > I don't see anything in the shell
>>>
>>> Really? Paste full uncut console output.
>>>
>>> >
>>> >
>>> > On Sun, Jun 23, 2013 at 3:57 AM, pablo platt <pablo.platt at gmail.com>
>>> wrote:
>>> >
>>> >> Sorry but the mailing list is called libav.
>>> >> How can I install ffmpeg on ubuntu 12.04 and above?
>>> >>
>>> >>
>>> >> On Sun, Jun 23, 2013 at 3:42 AM, Paul B Mahol <onemda at gmail.com>
>>> wrote:
>>> >>
>>> >>> On 6/23/13, pablo platt <pablo.platt at gmail.com> wrote:
>>> >>> > Hi,
>>> >>> >
>>> >>> > I'm trying to transcode a live RTMP stream to mp3.
>>> >>> > I can't make avconv write the output to stdout.
>>> >>> >
>>> >>> > I was trying:
>>> >>> > avconv -i rtmp://127.0.0.1/audio/test -f mp3 -
>>> >>> > and
>>> >>> > avconv -i rtmp://127.0.0.1/audio/test -f mp3 pipe:1
>>> >>> >
>>> >>> > But all I'm getting is a message that the speex header is missing.
>>> >>> > When I'm stopping the RTMP server I see some more message but not
>>> >>> getting
>>> >>> > mp3 packets.
>>> >>> >
>>> >>> > I'm using ubuntu 12.04 64bit with the libav-tools deb package.
>>> >>> > For testing I'm using the python rtmp server
>>> >>> > http://code.google.com/p/rtmplite/
>>> >>> >
>>> >>> > How can I make the output go to stdout?
>>> >>>
>>> >>> You are asking for help on ffmpeg mailing list for avconv
>>> >>> which is from libav (ffmpeg fork).
>>> >>>
>>> >>> If you want help for avconv don't ask here as this is
>>> >>> mailing list for ffmpeg only (real ffmpeg not fake one).
>>> >>> _______________________________________________
>>> >>> Libav-user mailing list
>>> >>> Libav-user at ffmpeg.org
>>> >>> http://ffmpeg.org/mailman/listinfo/libav-user
>>> >>>
>>> >>
>>> >>
>>> >
>>> _______________________________________________
>>> Libav-user mailing list
>>> Libav-user at ffmpeg.org
>>> http://ffmpeg.org/mailman/listinfo/libav-user
>>>
>>
>>
>
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