How to reduce the size of the resultant video while merging an audio and a video using FFMPEG?

0
votes

1) My Video is just 151kb with the following properties: (*ffmpeg.exe -i room3159_0.flv* )

Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 0.33 (1/3) Input #0, flv, from 'room3159_0.flv': Metadata: width : 940 height : 639 framerate : 1 videocodecid : 3 canSeekToEnd : true metadatacreator : Video Encoder 1.0 innowhite.com Duration: N/A, start: 0.000000, bitrate: N/A Stream #0.0: Video: flashsv, bgr24, 940x639, 0.33 tbr, 1k tbn, 1k tbc

2) My Audio is just 1.33MB with the following properties: (ffmpeg.exe -i abc111.mp3) ::::

[mp3 @ 000000000031A290]max_analyze_duration reached [mp3 @ 000000000031A290]Estimating duration from bitrate, this may be inaccurate Input #0, mp3, from 'abc111.mp3': Metadata: TSSE : Lavf52.61.0 Duration: 00:05:48.99, start: 0.000000, bitrate: 32 kb/s Stream #0.0: Audio: mp3, 8000 Hz, 1 channels, s16, 32 kb/s

3) On merging the above two files (audio & video), what is the least sized video that i can achieve? *while atleast maintaining the quality of the video.

i am getting a video with a whopping size of 19MB with the following command:

ffmpeg.exe -i room3159_0.flv -i abc111.mp3 -target ntsc-dvd -r 10 -b 150 -sameq -vcodec c opy VidAud.mpg (was trying to use the various parameters)

Thanks in advance!

RS

1
videoaudiomergeffmpegsize

1 Answers

1
votes

From the parameters it seems like you are encoding to MPEG2 for NTSC dvd. It has a defined minimum bitrate, check this link on doom9 archives.

Your audio has 5 minutes. So, your resulting mpg will have 5 minutes, and if it's 2000mbit (which is minimum for the DVD), go figure the rest...