Mux 3gp audio file with jpg image to create video clip

[Michael Rampe]

[C David Young] “Stream #1.0: Audio: amr_nb (samr / 0x726D6173), 8000 Hz, 1 channels, flt, 12 kb/s”

It looks like the -acodec copy that is giving you grief in the .mp4 container. Try aac (libfaac) or mp3 (libmp3lame) instead.

Michael

[C david Young]

Thanks for your suggestion, Michael. I am tried aac and got the following error. I also tried just converting the .3gp file to .aac and got the same error. Am I doing anything obviously wrong?

C:\Android\images>C:/Android/ffmpeg-git-a254452-win32-static/bin/ffmpeg -y -i IMAG001.3gp -acodec aac IMAG001.aac
ffmpeg version N-32726-ga254452, Copyright (c) 2000-2011 the FFmpeg developers
built on Sep 19 2011 19:49:13 with gcc 4.6.1
configuration: –enable-gpl –enable-version3 –enable-runtime-cpudetect –enable-avisynth –enable-bzlib –enable-frei0r –enable-libo
enable-libspeex –enable-libtheora –enable-libvo-aacenc –enable-libvo-amrwbenc –enable-libvorbis –enable-libvpx –enable-libx264 –en
libavutil 51. 16. 1 / 51. 16. 1
libavcodec 53. 16. 0 / 53. 16. 0
libavformat 53. 12. 0 / 53. 12. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 43. 2 / 2. 43. 2
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[amr @ 01B785E0] max_analyze_duration 5000000 reached at 5000000
[amr @ 01B785E0] Estimating duration from bitrate, this may be inaccurate
Input #0, amr, from ‘IMAG001.3gp’:
Duration: 00:00:06.74, bitrate: 12 kb/s
Stream #0.0: Audio: amr_nb (samr / 0x726D6173), 8000 Hz, 1 channels, flt, 12 kb/s
Incompatible sample format ‘flt’ for codec ‘aac’, auto-selecting format ‘s16’
[aac @ 01A07BE0] Too many bits per frame requested
Output #0, adts, to ‘IMAG001.aac’:
Stream #0.0: Audio: aac, 8000 Hz, 1 channels, s16, 128 kb/s
Stream mapping:
Stream #0.0 -> #0.0 (amrnb -> aac)
Error while opening encoder for output stream #0.0 – maybe incorrect parameters such as bit_rate, rate, width or height

C:\Android\images>C:/Android/ffmpeg-git-a254452-win32-static/bin/ffmpeg -y -i IMAG001.3gp -acodec aac IMAG001.aac

[Michael Rampe]

Haven’t dealt with your input codec before but:

[C David Young] “Error while opening encoder for output stream #0.0 – maybe incorrect parameters such as bit_rate, rate, width or height”

you need to set these parameters…

here are some examples:
bitrate: -ab 128k
rate: -ar 48k
channels: -ac 2

Also, by specifying aac as the encoder, you are using the experimental aac encoder. I would recommend installing libfaac and recompiling FFmpeg with –enable-libfaac. The you would specify -acodec libfaac.

Michael

[C david Young]

Thanks for the info. I tried

ffmpeg -y -f image2 -r .2 -i IMAG001.jpg -i IMAG001.3gp -ab 128k -ar 48k -ac 2 -strict experimental -acodec aac IMAG001.mp4

and it does not give me an error now but, as you said, the results were not good. The audio sounds ok but the image is missing.

I’ll try recompiling with the –enable-libfaac. It is a good thing that I have spent days trying to get the Win32 cross-compile to work and finally succeeded. I’ll give this a try later today. Thanks!

[C david Young]

Well, another stumbling block.

../ffmpeg/configure –enable-memalign-hack –arch=x86 –target-os=mingw32 –enable-nonfree –enable-libfaac –cross-prefix=i686-w64-mingw32-
ERROR: libfaac not found

I have the latest git from ffmpeg…

[Michael Rampe]

[C David Young] “ERROR: libfaac not found”

You need to install libfaac first:
https://www.audiocoding.com/faac.html

And while you are at it, you might as well install x264 and mp3lame as well for flexibility.

Michael

[Michael Rampe]

[C David Young] “The audio sounds ok but the image is missing.”

You need the -map command for two inputs.

Michael

[C david Young]

Michael,

Thanks for your patience.

I am trying to follow the instructions in the INSTALL file that follow. Is this the correct way to install libfaac? In particular, the part about libmp4v2 is confusing.

General FAAC compiling instructions

1. Make sure you have recent versions of autoconf, automake and libtool installed.
For MP4 writing and tagging support, you must enable compiling with internal libmp4v2 (included in /common/mp4v2/).
2. cd to FAAC source dir
3. Run:
./configure
make
make install

[C david Young]

I tried putting “-map 0:v” after the video input and it made no difference. I also put “-map 0:a” after the audio input and it said there was no such stream. However, I am having some success as follows. Now to see if I can append the individual slides, each of which will be an mp4 file.

I can convert the 3gp audio to aac with the following:

ffmpeg -y -i IMAG001.3gp -ab 128k -ar 48k -ac 2 -strict experimental -acodec aac IMAG001.aac

When I add the video the resulting mp4 plays the audio with the image.

ffmpeg -y -f image2 -r .2 -i IMAG001.jpg -i IMAG001.aac -s 720×480 IMAG001.mp4