Problem with ffmpeg soundstream

[Reuben Martin]

It depends on what version of ffmpeg is being used. What you are trying to do will work with the latest version of ffmpeg, but not on older versions.

You may be using an older version where you have to explicitly map each audio channel and use a “-newaudio” syntax to have more than one audio stream in the output. (“-newaudio” is depreciated and no longer works on the most recent versions)

[Daniel Bean]

Thank you for your answer. I have downloaded the version 0.9 and tried the command:

ffmpeg -i abm.mkv -map 0 -vcodec copy -acodec copy -vbsf h264_changesps=level=41 abmmuss.mkv


But i get a mistake notification: Unknown bitstream filter h264_changesps=level=41

I don’t know where the mistake is. Are you able to help me?

Thank you

[Reuben Martin]

That bitstream filter is not a standard ffmpeg filter. You have to apply a patch before building ffmpeg in order to access that functionality.

ffmpeg -bsfs

will tell you what bitstream filters are available.

The patch for the filter you are referring to can be found here: https://forum.doom9.org/showthread.php?t=152419

I think they have some patched win32 builds available.

[Daniel Bean]

From this site i had the first version i used. The version you said its an old version. I don’t know how i have to integrate the filter.
ffmpeg -bsfs give me this information:

ffmpeg version N-35709-g7d531e8, Copyright (c) 2000-2011 the FFmpeg developers
built on Dec 12 2011 13:56:52 with gcc 4.6.2
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
-enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
libxvid --enable-zlib
libavutil 51. 32. 0 / 51. 32. 0
libavcodec 53. 43. 0 / 53. 43. 0
libavformat 53. 24. 0 / 53. 24. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 53. 0 / 2. 53. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
Bitstream filters:
text2movsub
remove_extra
noise
mov2textsub
mp3decomp
mp3comp
mjpegadump
mjpeg2jpeg
imxdump
h264_mp4toannexb
dump_extra
chomp
aac_adtstoasc

Thank you for your help!!

[Reuben Martin]

The version you are using is a build of the 0.9 version. As you can see from the output there is no “h264_changesps” in the list of supported bitstream filters. Basically you can not do what you’re trying to do with the version of ffmpeg that you are using.

Assuming you are on windows, you need this version here: https://sourceforge.net/projects/direct264/files/Related%20Programs/ffmpeg%20%28demuxer_muxer%20only%29/ffmpeg_git_31792.7z/download

[Daniel Bean]

Thank you. But now i get a different error:

Number of stream maps must match numer of output streams

I don’t know what this means…

[Reuben Martin]

Yes, that patched version of ffmpeg is based off of an older version of ffmpeg, which uses different syntax for stream mapping.

Try adding “-newaudio” onto the end of the command you are using. This is how the older versions added additional audio streams. The newer 0.9 doesn’t need that, but the modified version you are using is probably based of 0.7 or 0.8.

(Basically, you are running into problems because online documentation, especially stuff found in community forums don’t tend to relay the version of ffmpeg being used. As new features get added, the syntax changes to accommodate new features.)