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Old 02-06-2006, 01:06 PM   #1
cato4liberty
LQ Newbie
 
Registered: Aug 2003
Posts: 9

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HOWTO: Convert MPEG2 into MP4


I use the following steps to convert video capture MPEG2 files into MP4 format (H.264 and AAC). Basically, the video will be converted into H.264 using two-pass x264, and the PCM audio will be converted into AAC. The H.264 video and AAC audio will then be muxed into the MP4 container.

In a few test runs I noticed that MP4 took up less than half the space of MPEG2 at a similar quality level.
  • MPEG2: 18 MB (640x480 @ 29.9 fps, 2662 kbps video, 128 kbps 48 khz audio)
  • MP4: 8.2 MB (640x480 @ 29.9 fps, 1002 kbps video, 125k 48 khz audio)
___________________________________________________________________

Steps to convert MPEG2 into MP4

Demux MPEG2 into M2V and MP2
Code:
mpeg_ps_extract --video --audio myfile.mpeg
Convert video: M2V to x264 - Pass 1
Code:
mencoder -ovc x264 -x264encopts pass=1:\
qcomp=0.75:subq=5:4x4mv:8x8dct:frameref=2:bframes=3:b_pyramid:\
weight_b:log=-1 -ofps 29.97 -vf scale=640:480 -passlogfile \
x264logfile myfile.m2v -of rawvideo -o myfile.264
Convert video: M2V to x264 - Pass 2
Code:
mencoder -ovc x264 -x264encopts pass=2:bitrate=1000:qcomp=0.75:\
subq=5:4x4mv:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b:\
log=-1 -ofps 29.97 -vf scale=640:480 -passlogfile x264logfile \
myfile.m2v -of rawvideo -o myfile.264
Extract audio into PCM WAV
Code:
ffmpeg -v 0 -i myfile.mpeg -vn myfile.wav
Convert audio: PCM WAV to AAC
Code:
faac --mpeg-vers 4 -b 128 -c 44100 myfile.wav -o myfile.aac
Mux into MP4: H.264 video and and AAC audio
Code:
MP4Box -add myfile.264:fps=29.97 -add myfile.aac myfile.mp4
 
Old 02-06-2006, 01:08 PM   #2
cato4liberty
LQ Newbie
 
Registered: Aug 2003
Posts: 9

Original Poster
Rep: Reputation: 0
Here are details of the input file (MPEG2) and the output file (MP4).

Details of the input file (MPEG2)
Code:
$ midentify myfile.mpeg
ID_VIDEO_ID=0
ID_AUDIO_ID=0
ID_FILENAME=myfile.mpeg
ID_DEMUXER=mpegps
ID_VIDEO_FORMAT=0x10000002
ID_VIDEO_BITRATE=2662400
ID_VIDEO_WIDTH=480
ID_VIDEO_HEIGHT=480
ID_VIDEO_FPS=29.970
ID_VIDEO_ASPECT=1.3333
ID_AUDIO_CODEC=mp3
ID_AUDIO_FORMAT=80
ID_AUDIO_BITRATE=128000
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
ID_LENGTH=60.17
ID_VIDEO_CODEC=mpegpes
Details of the output file (MP4)
Code:
$ midentify myfile.mp4
ID_VIDEO_ID=0
ID_AUDIO_ID=1
ID_FILENAME=myfile.mp4
ID_DEMUXER=mov
ID_VIDEO_FORMAT=avc1
ID_VIDEO_BITRATE=0
ID_VIDEO_WIDTH=640
ID_VIDEO_HEIGHT=480
ID_VIDEO_FPS=29.969
ID_VIDEO_ASPECT=0.0000
ID_AUDIO_CODEC=faad
ID_AUDIO_FORMAT=mp4a
ID_AUDIO_BITRATE=125424
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
ID_LENGTH=60.33
ID_VIDEO_CODEC=ffh264
Details of the output file (MP4) using mp4info
Code:
$ mp4info myfile.mp4
mp4info version 1.4.1
myfile.mp4:
Track   Type    Info
1       video   H264 High @5.1, 60.329 secs, 1002 kbps, 640x480 @ 29.935852 fps
2       audio   MPEG-4 AAC LC, 60.501 secs, 125 kbps, 48000 Hz
 
Old 02-06-2006, 01:09 PM   #3
cato4liberty
LQ Newbie
 
Registered: Aug 2003
Posts: 9

Original Poster
Rep: Reputation: 0
If anyone has suggestions for improvement, please do share your thoughts. I am curious about any options or settings to improve the quality or reduce the conversion time.
 
  


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