convert from avi to mp4 using ffmpeg - html

Question

I want to play an avi video format file in browsers using HTML5 video code. Since the
avi format file doesn't play in browsers i have to convert it into mp4 format file.
For conversion i am using the ffmpeg code in Windows.
ffmpeg -i input.avi OUTPUT.mp4
The conversion of video is completed but the video codec and audio codec isn't valid thus it fails to play to play using video tag in html5.
Please find me proper code which coverts the file.
another conversion code i tried was.. ffmpeg -i input.avi -c:v libx264 -preset slow -crf 22 -c:a libfaac -b:a 128k OUTPUTAVINew.mp4 but i got error as libfaac unknown encoder
please help me out and even i downloaded the **libfaac.dll** but didn't work out
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Answer 1

Old, but this post comes up tops in searches so...
ffmpeg should easily convert from avi to mp4 without re-encoding. (Do not specify new codecs!)
ffmpeg -i input.avi -c:v copy -c:a copy OUTPUT.mp4
Should also mention that batch conversions run most reliably when the script contains static data with each ffmpeg call on a new line (as opposed to having the script generate each call dynamically using variables).

Answer 2

I would suggest you use the latest version of ffmpeg. You don't
need to download extra dlls.
Use libvo_aacenc instead of libfaac
-crf 22 is high use lower say -crf 19
As far my experience I would use
ffmpeg -i input.avi -c:v libx264 -preset slow -crf 19 -c:a libvo_aacenc -b:a 128k

Answer 3

code to avi to mp4.ffmpeg provides the best solution
ffmpeg -i input.avi -strict -2 output.mp4

Answer 4

For example there is a video file 139MB input.avi
ffprobe input.avi
Input #0, avi, from 'input.avi':
Metadata:
encoder : Lavf51.12.1
Duration: 00:21:20.16, start: 0.000000, bitrate: 891 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 769 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 32000 Hz, stereo, fltp, 112 kb/s
For the nearly loseless re-containering use:
ffmpeg -i "input.avi" -c:v copy -c:a copy "input.mp4"
where -c:v copy copy video
-c:a copy copy audio
Conversion about 2 sec, result is input.mp4 138MB. It is fast, and almost same quality as original. Best practice is let the audio in the original format.
ffprobe input.mp4
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf58.29.100
Duration: 00:21:20.16, start: 0.000000, bitrate: 884 kb/s
Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 769 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 32000 Hz, stereo, fltp, 112 kb/s (default)
Metadata:
handler_name : SoundHandler
If you have time, and want to recodec almost same quality, but 1/3 size, use this:
ffmpeg -i "input.avi" -c:a copy -c:v vp9 -b:v 100K "input.vp9.mp4"
where -c:a copy copy audio -c:v vp9 -b:v 100K re-encode video with 100K bitrate. 138MB re-encoding takes about 40min and the new file size is 41MB the quality is nearly same as original, but pixeled a bit.
ffprobe input.vp9.mp4
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf58.29.100
Duration: 00:21:20.16, start: 0.000000, bitrate: 261 kb/s
Stream #0:0(und): Video: vp9 (Profile 0) (vp09 / 0x39307076), yuv420p(tv, progressive), 640x480, 146 kb/s, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 32000 Hz, stereo, fltp, 112 kb/s (default)
Metadata:
handler_name : SoundHandler