The VideoLAN Forums

Posted: **20 May 2011 08:35**

Hi everybody,

I always get a "Streaming / Transcoding failed:VLC could not open the encoder." (Win7 and Server 2003 R2) when trying to download and convert to iphone like this:

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./vlc.exe --verbose=2 'http://wm.globo.com/webmedia/windows.asx?usuario=gazetaes&tipo=ondemand&path=/tvgazeta/globoesporte_180511_01.wmv&ext.asx' :sout='#transcode{width=320,canvas-height=240,vcodec=mp4v, vb=768, acodec=mp4a, ab=96, channels=2}:std{access=file, mux=mp4, dst=myvideo.mp4}'

Looks like the mp4a codec is not available - googled for it but found nothing that helped. So there must be something different totally wrong - or misunderstood, as I have not much skills in video technology.

This is the sequence in the verbose=2 log:

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...
main debug: looking for encoder module: 13 candidates
avcodec debug: libavcodec already initialized
avcodec error: cannot open encoder
main debug: no encoder module matching "any" could be loaded
main debug: TIMER module_need() : 12.664 ms - Total 12.664 ms / 1 intvls (Avg 12.664 ms)
stream_out_transcode error: cannot find video encoder (module:any fourcc:mp4v)
main debug: removing module "avcodec"
avcodec debug: ffmpeg codec (Windows Media Video 9) stopped
...

Thanks!

Thomas

Posted: **20 May 2011 10:54**

Try to force samplerate

Posted: **21 May 2011 10:58**

I always get a "Streaming / Transcoding failed:VLC could not open the encoder.

Hi
Maybe VLC-v1.1.9 has no MPEG-4 Part 2 (mp4v) video encoder fitted.
Try with MPEG-4 Part 10 (x264) instead.
Something like this:-

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vlc.exe "http://wm.globo.com/webmedia/windows.asx?usuario=gazetaes&tipo=ondemand&path=/tvgazeta/globoesporte_180511_01.wmv&ext.asx" :sout="#transcode{venc=x264{profile=baseline,level=13,crf=24},acodec=mp4a,ab=96k}:std{access=file,mux=mp4,dst=myvideo.mp4}"

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General
Complete name                    : C:\Program Files\VideoLAN\VLC\myvideo.mp4
Format                           : MPEG-4
Format profile                   : Base Media
Codec ID                         : isom
File size                        : 22.2 MiB
Duration                         : 5mn 15s
Overall bit rate                 : 590 Kbps
Encoded date                     : UTC 2011-05-22 13:25:57
Tagged date                      : UTC 2011-05-22 13:25:57
Writing application              : vlc 1.1.9 stream output
Comment                          : QuickTime 6.0 or greater

Video
ID                               : 2
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : Baseline@L1.3
Format settings, CABAC           : No
Format settings, ReFrames        : 3 frames
Codec ID                         : avc1
Codec ID/Info                    : Advanced Video Coding
Duration                         : 5mn 15s
Bit rate mode                    : Variable
Bit rate                         : 501 Kbps
Width                            : 320 pixels
Height                           : 240 pixels
Display aspect ratio             : 4:3
Frame rate mode                  : Variable
Frame rate                       : 29.970 fps
Minimum frame rate               : 28.600 fps
Maximum frame rate               : 30.333 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.218
Stream size                      : 18.8 MiB (85%)
Language                         : English
Encoded date                     : UTC 2011-05-22 13:25:57
Tagged date                      : UTC 2011-05-22 13:25:57

Audio
ID                               : 1
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : LC
Codec ID                         : 40
Duration                         : 5mn 15s
Bit rate mode                    : Variable
Bit rate                         : 79.8 Kbps
Maximum bit rate                 : 2 032 Mbps
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 44.1 KHz
Compression mode                 : Lossy
Stream size                      : 3.00 MiB (14%)
Language                         : English
Encoded date                     : UTC 2011-05-22 13:25:57
Tagged date                      : UTC 2011-05-22 13:25:57

EDIT
I've revised the command with better options for iPods (venc=x264{profile=baseline,level=13,crf=24},acodec=mp4a,ab=96k)

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Codec mp4a: Could not open the encoder

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