Re: [Mjpeg-users] encoding mp4 to mpeg2 DVD format

[JD <jd...@gm...>]

On 09/28/2012 11:03 PM, Bernhard Praschinger wrote:
> Hallo
>
> mpeg2enc cannot transcode this way.
> You need some other program to generate the yuv4mpeg format, mplayer 
> for example can do this for you. In the mjpegtools wiki is a short 
> howto: 
> http://sourceforge.net/apps/mediawiki/mjpeg/index.php?title=Creating_videos_from_other_sources 
>
>
> > mkfifo stream.yuv
> > cat stream.yuv | mpeg2enc -f 8 -o video.m2v &
> > mplayer -nosound -noframedrop -vo yuv4mpeg yourfile.mp4
>
> The thing slightly missing is the audio decoding/ encoding:
> > mplayer -vo null -ao pcm:fast Video_12.mp4
> > cat audiodump.wav | mp2enc -r 48000 -o audio.mp2
>
> and than mplex it together with:
> > mplex -f 8 audio.mp2 video.m2v -o reencoded.mpg
>
> the last step is running dvdauthor.
>
> auf hoffentlich bald,
>
> Berni the Chaos of Woodquarter
>
> Email: sha...@ut...
> www: http://www.lysator.liu.se/~gz/bernhard
>
Hi Barnhard,

Well after a few hours of running the script:
#!/bin/ksh
[ $# -lt 2 ] && echo 'Usage: $0 <file.mp4> <file.mpg>' && exit 1
mkfifo stream.yuv
cat stream.yuv | mpeg2enc -f 8 -o video.m2v &
mplayer -nosound -noframedrop -vo yuv4mpeg $1

# The thing slightly missing is the audio decoding/ encoding:
mplayer -vo null -ao pcm:fast $1
cat audiodump.wav | mpeg2enc -r 48000 -o audio.mp2

# and than mplex it together with:
mplex -f 8 audio.mp2 video.m2v -o $2


it ended with the following error messages:

Playing /sdb4/Misc/Media/Jesus_Christ_SuperStar.mp4.
libavformat file format detected.
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0, -alang und
VIDEO:  [H264]  450x360  24bpp  25.000 fps  379.7 kbps (46.4 kbyte/s)
Clip info:
  major_brand: mp42
  minor_version: 0
  compatible_brands: isommp42
  creation_time: 2012-08-26 15:53:18
Load subtitles in /sdb4/Misc/Media/
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 44100 Hz, 2 ch, s16le, 96.0 kbit/6.80% (ratio: 11999->176400)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
[AO PCM] File: audiodump.wav (WAVE)
PCM: Samplerate: 44100Hz Channels: Stereo Format s16le
[AO PCM] Info: Faster dumping is achieved with -benchmark -vc null -vo 
null -ao pcm:fast
[AO PCM] Info: To write WAVE files use -ao pcm:waveheader (default).
AO: [pcm] 44100Hz 2ch s16le (2 bytes per sample)
Starting playback...
Unsupported PixelFormat 61
Unsupported PixelFormat 53
Movie-Aspect is undefined - no prescaling applied.
VO: [null] 450x360 => 450x360 Planar YV12
A:   2.6 V:   2.3 A-V:  0.281 ct:  0.040   0/  0 11%  0% 0.8% 53 0


            ************************************************
            **** Your system is too SLOW to play this!  ****
            ************************************************

/> the SLOW message is strange as mplayer has no problems playing this 
mp4 file!/

Possible reasons, problems, workarounds:
- Most common: broken/buggy _audio_ driver
   - Try -ao sdl or use the OSS emulation of ALSA.
   - Experiment with different values for -autosync, 30 is a good start.


    Exiting... (End of file)
    **ERROR: [mpeg2enc] -r option requires arg 0 .. 32

    INFO: [mplex] mplex version 2.0.0 (2.2.7 $Date: 2010/03/13 13:05:07 $)
    **ERROR: [mplex] Unable to open file audio.mp2 for reading.