FFMpeg isn't taking audio sampling rate more than 8000 for RM videos

[rajivrp]

Hi,

I recently refreshed FFMpeg (from 0.6 to 1.2) and I realize the new binary isn't taking the audio sampling rate more than 8000 for RM.

Any idea why is this not supported any longer ? It used to work earlier.

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C:\Users\Administrator\Desktop\FFMpeg\1.2>ffmpeg.e xe -i C:\Samples\Wildlife.mp4
-f rm -vcodec rv10 -r 15 -s 320x176 -aspect 1.8181818181818181 -b:v 100000 -qsca
le 15 -acodec real_144 -ac 1 -ar 16000 -vol 256 -strict experimental C:\Samples
\Output.rm
ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
built on Mar 28 2013 00:34:08 with gcc 4.8.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo
pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl
e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Samples\Wildlife.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01 00:00:00
title : Wildlife in HD
encoder : Lavf53.24.0
comment : Footage: Small World Productions, Inc; Tourism New Zealand
| Producer: Gary F. Spradling | Music: Steve Ball
copyright : © 2008 Microsoft Corporation
Duration: 00:00:30.14, start: 0.000000, bitrate: 5514 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720,
5392 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 12
7 kb/s
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : SoundHandler
Please use -q:a or -q:v, -qscale is ambiguous
[real_144 @ 0000000004450a20] Specified sample rate 16000 is not supported
Output #0, rm, to 'C:\Samples\Output.rm':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
copyright : © 2008 Microsoft Corporation
title : Wildlife in HD
encoder : Lavf53.24.0
comment : Footage: Small World Productions, Inc; Tourism New Zealand
| Producer: Gary F. Spradling | Music: Steve Ball
Stream #0:0(eng): Video: rv10, yuv420p, 320x176 [SAR 1:1 DAR 20:11], q=2-31,
100 kb/s, 90k tbn, 15 tbc
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
Stream #0:1(eng): Audio: ra_144, 16000 Hz, mono, s16, 128 kb/s
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> rv10)
Stream #0:1 -> #0:1 (aac -> real_144)
Error while opening encoder for output stream #0:1 - maybe incorrect parameters
such as bit_rate, rate, width or height

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Thanks,
Rajiv

[Chris K]

try...

-acodec real_288

[rajivrp]

I don't think FFMpeg has the ability to encode real_288 yet. It gives below error ..

Unknown encoder 'real_288'

[Chris K]

Yes I see! It only decodes real_288.

Probably a license issue. Are you sure it accepted -ar 16000 in the past?

[rajivrp]

Yes I think so ... It gave me a warning "Overflow. Broken sample", but converted the video successfully.

And if I look at the video properties in MediaInfo tool it does show sampling rate as 16000.

Pls see the attached output using old binary..

What about the license .. I am not aware of any license for FFMpeg.

[rajivrp]

https://forum.videohelp.com/attachment.php?attachmentid=17913&stc=1&d=1368801350

[Chris K]

What about the license .. I am not aware of any license for FFMpeg.

Not for FFmpeg. For the real audio encoder to include in FFmpeg.

Yes I've seen the output and FFmpeg says 16000. When I try it with a recent version with -ar 16000 it encodes but the output says 8000. They must have changed that.

[Baldrick]

Moving you to our video conversion section.

[El Heggunte]

Since you're on a Windows machine, and since ffmpeg not always works as it should, I think you'd better encode the audio part with Easy RealMedia Producer, and later add the new audio to the video encoded by ffmpeg.

And if the RealMedia multiplexer of ffmpeg happens to fail, you can try the standalone RM muxer.

[rajivrp]

Yeah ....... I realize it too of late that FFMpeg is quite inconsistent especially when you change the version. Am struggling with bunch of conversion options that are just not available any longer apparently, will perhaps post them in a separate thread to see if anyone has any idea.

Actually I am using it in an app for doing various kinds of conversions across different formats, so probably it won't be too feasible to introduce a new tool just for RM for only this specific usecase.

Thanks anyways guys.