Hello. I have a .3gp file containing a video and an audio channel.
I'm trying to get the audio channel in a separate m4a file but when I issue: ffmpeg -i foo.3gp -vn -c:a copy foo.m4a I get a constantly encoded AAC audio channel while the original was a variably encoded one. In more detail, from this: Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : mp4a-40-2 Bit rate mode : Variable Bit rate : 32.0 kb/s Maximum bit rate : 34.4 kb/s Channel(s) : 1 channel Channel positions : Front: C Sampling rate : 22.05 kHz Frame rate : 21.533 FPS (1024 SPF) Compression mode : Lossy Stream size : 82.4 MiB (60%) I end up with this: Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : mp4a-40-2 Bit rate mode : Constant Bit rate : 32.0 kb/s Channel(s) : 2 channels Channel(s)_Original : 1 channel Channel positions : Front: C Sampling rate : 22.05 kHz Frame rate : 21.533 FPS (1024 SPF) Compression mode : Lossy Stream size : 82.4 MiB (98%) Default : Yes Alternate group : 1 Thanks in advance, Sophoklis _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
