Why is ffmpeg failing to convert mov to mp4?

[zBernie]

Using the ffmpeg command below, I can convert 1080 mov videos taken with my iPhone 4s to mp4. But when I try to convert a mov file taken with my Canon SX 1, it fails with these errors;

ffmpeg -i christmas_2012-01.mov -acodec copy -vcodec copy christmas_2012-01-ff.mp4

mp4 @ 0x7ffc92051600] track 1: could not find tag, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted[/COLOR]


Here are the video's attributes:

ID_VIDEO_ID=0
ID_AUDIO_ID=0
ID_AID_0_LANG=eng
ID_CLIP_INFO_NAME0=major_brand
ID_CLIP_INFO_VALUE0=qt
ID_CLIP_INFO_NAME1=minor_version
ID_CLIP_INFO_VALUE1=537331968
ID_CLIP_INFO_NAME2=compatible_brands
ID_CLIP_INFO_VALUE2=qt CAEP
ID_CLIP_INFO_NAME3=creation_time
ID_CLIP_INFO_VALUE3=2012-12-24 19:44:27
ID_CLIP_INFO_N=4
ID_FILENAME=christmas_2012-01.mov
ID_DEMUXER=lavfpref
ID_VIDEO_FORMAT=H264
ID_VIDEO_BITRATE=2483240
ID_VIDEO_WIDTH=320
ID_VIDEO_HEIGHT=240
ID_VIDEO_FPS=30.000
ID_VIDEO_ASPECT=0.0000
ID_AUDIO_FORMAT=1
ID_AUDIO_BITRATE=1411200
ID_AUDIO_RATE=44100
ID_AUDIO_NCH=2
ID_START_TIME=0.00
ID_LENGTH=71.60
ID_SEEKABLE=1
ID_CHAPTERS=0
ID_VIDEO_CODEC=ffh264
ID_AUDIO_BITRATE=1411200
ID_AUDIO_RATE=44100
ID_AUDIO_NCH=2
ID_AUDIO_CODEC=pcm
ID_EXIT=EOF

[Wolfen]

I don't think uncompressed audio(ID_AUDIO_CODEC=pcm) is supported in a .MP4 container.

[zBernie]

To answer my own question, the audio codec was incompatible with the mp4 container, so I just specified AAC like:

ffmpeg -y -i christmas_2012-02.mov -c:a libfaac -vcodec copy christmas_2012-02-ff.mp4

[Wolfen]

You'll have to re-encode your audio

ffmpeg.exe -i christmas_2012-01.mov -vcodec copy -acodec aac -ab 128k christmas_2012-01.mp4

[zBernie]

I don't understand why it has to be re-encoded -- The audio codec appears to be the same using your command or my original one:

ID_AUDIO_CODEC=ffaac

-Thanks

[Wolfen]

fmpeg -y -i christmas_2012-02.mov -c:a libfaac -vcodec copy christmas_2012-02-ff.mp4

Don't know maybe it's trying to use the bitrate from the .mov file for aac encoding.