.MOV to .MP3 but 0 file size???

[kileyham]

I just installed ffmpegx on an imac running snow leopard (works great on my macbook pro running lion). Everything seems to run well and conversion appears to take place, but i get an .avi file and an .mp3 with no data. the file i'm converting is h.264 at 44100. i changed the audio setting for the .mp3 to 44100 from the default 48000, but same result. it looks like it's converting, but the .mp3 is "empty." also, not sure why it's producing an .avi. when i try to view the .avi, it appears to run in the viewer but only still frames. please help! kiley

[Case]

For conversion of .MOV to .MP3, use the "Movie audio to MP3" preset. This should disable video encoding.
You were right to match the audio sampling rate of the output to the sampling rate of the source file (e.g. 44100 Hz), unless you need a different rate for some specific purpose (e.g. DVD-Video needs 48 kHz).
If you were trying a different kind of conversion, please let us know for better suited answers.

If a conversion fails, have a look at the Process Information log. (You may access this log by clicking the blue "i" in the ffmpegX Progress window.)
If you find two input streams (Stream #0.0, Stream #0.1) and an error "Codec type mismatch for mapping", then set "Invert mapping" in the Audio tab. Often .MOV files have their streams inverted from what is expected, in which case the ffmpeg version in ffmpegX needs to know about that, which is done by the "mapping" feature.

If it still won't work after this, then please post the Process Information log for examination.

[kileyham]

Thanks for the reply. I'm using the "Movie Audio to MP3" preset. 44100 on the input and output side. I inverted the mapping and got the same result. Here's the Process Log. Thanks again for your help.

Encoding started on Wed Feb 22 16:54:35 CST 2012
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
libavutil version: 49.0.0
libavcodec version: 51.9.0
libavformat version: 50.4.0
movtoy4m
Copyright 2002-2006 Johan Lindström
All rights reserved..
Input #0, yuv4mpegpipe, from 'pipe:':
Duration: N/A, bitrate: N/A
Stream #0.0, 0.02 fps(r): Video: rawvideo, yuv420p, 640x480
Output #0, avi, to '/Volumes/GLYPH-Video/BlackMagic Capture/SMW - 021912 1100 FINAL1.mov.ff.avi.mp3.e.avi':
Stream #0.0, 0.02 fps(c): Video: rawvideo, yuv420p, 640x480, q=2-31
Stream mapping:
Stream #0.0 -> #0.0
video:31050kB audio:0kB global headers:0kB muxing overhead 0.019751%
bench: utime=0.040s
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
libavutil version: 49.0.0
libavcodec version: 51.9.0
libavformat version: 50.4.0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Volumes/GLYPH-Video/BlackMagic Capture/SMW - 021912 1100 FINAL1.mov':
Duration: 00:47:43.5, start: 0.000000, bitrate: 2119 kb/s
Stream #0.0(eng): Audio: aac, 44100 Hz, stereo
Stream #0.1(eng), 24.00 fps(r): Video: h264, yuv420p, 640x480
Codec type mismatch for mapping #0.1 -> #0.0

[Case]

It seems that MOV files are treated differently form other types of files by ffmpegX. And for this type of conversion, you may have stumbled upon a genuine bug in the app.

For this to work, please make it a two step process:
1/ In QuickTime Player 10, open the MOV and choose File>Export>Audio only to save the audio portion as .m4a .
2/ Open the M4A in ffmpegX, select preset "Audio file to mp3", set/confirm 44100 Hz, Encode.

[kileyham]

do you anticipate a bug fix? thx.

also, i tried the conversion wtih a .mp4 version of the same file as earlier and got the same result.....

[Case]

Do you anticipate a bug fix?

I have no insight into the schedule of the developer. I wouldn't wait for it, but I'd welcome any new version with improvements that he (?) may choose to release.

Also, i tried the conversion wtih a .mp4 version of the same file as earlier and got the same result.....

I did make different suggestion that worked on my test file.
Did you try this? --

For this to work, please make it a two step process:
1/ In QuickTime Player 10 (QuickTime Player X), open the MOV and choose File>Export>"Audio only" to save the audio portion as .m4a .
2/ Open the M4A in ffmpegX, select preset "Audio file to mp3" (not "Movie file to mp3"), set/confirm 44100 Hz, Encode.

Does this work for you?

[kileyham]

I'm sure it would work fine, but I'm really looking for a one step process. I think I'm going to try another converter