when trying to render sound to ac3 i get
FileAC3::open_file codec not found.
... the failing line is
codec = avcodec_find_encoder(CODEC_ID_AC3);
it seems to be libavcodec problem... anyone knows how to make it work?
is there anything special about libavcodec to be compiled with ac3
support?
bye
andraz
On pon, 2006-03-27 at 18:41 +0200, Andraz Tori wrote:
> -------- Forwarded Message --------
> Od: Nicolas <[EMAIL PROTECTED]>
> Odgovori-na:: [email protected]
> Za: Mailing-list cinelerra CVS <[email protected]>
> Zadeva: [CinCVS] Scripts to encode a Cinelerra video into various
> formats
> Datum: Fri, 17 Mar 2006 23:02:48 +0100
>
> Hello,
>
> I put here the command lines I used to export to several formats the
> videos I make with Cinelerra. I hope that will help someone reading the
> mailing-list archives in the future. Cinelerra is an EXCELLENT tool, but
> its export formats aren't perfect. Fortunately, there's always a good
> method to use to get your video in the format and quality you need. The
> command lines assume your input is PAL, 25fps and progressive. You'll
> have to add/modify some parameters if your video is interlaced.
>
> 1 - ENCODING A CINELERRA VIDEO TO DVD WITH THE "NOT SO GOOD" METHOD
> -------------------------------------------------------------------
> Here are the syntax I used to "two pass encode" the .mov file into an
> mpeg2 video. The .mov file is a progressive (non interlaced) video
> produced by Cinelerra (Quicktime DV+Audio 2 complements). You have to
> add some parameters to the mencoder command lines if your .mov file is
> interlaced (look at the ilmv, ildct and ilme parameters).
> mencoder -nosound -ovc lavc -of rawvideo -vf scale=720:576,harddup
> -srate 48000 -af lavcresample=48000 -lavcopts
> vcodec=mpeg2video:vbitrate=7500:vrc_maxrate=9800:vrc_minrate=2000:\
> vrc_buf_size=1835:keyint=15:trell:mbd=2:precmp=3:subcmp=3:cmp=3:\
> dia=-10:predia=-10:preme=2:cbp:mv0:vqmin=1:lmin=1:dc=10:aspect=4/3:vpass=1
> -ofps 25 -noskip -o /dev/null movie.mov mencoder -nosound -ovc lavc -of
> rawvideo -vf scale=720:576,harddup -srate 48000 -af lavcresample=48000
> -lavcopts
> vcodec=mpeg2video:vbitrate=7500:vrc_maxrate=9800:vrc_minrate=2000:\
> vrc_buf_size=1835:keyint=15:trell:mbd=2:precmp=3:subcmp=3:cmp=3:\
> dia=-10:predia=-10:preme=2:cbp:mv0:vqmin=1:lmin=1:dc=10:aspect=4/3:vpass=2
> -ofps 25 -noskip -o movie.m2v movie.mov
> I don't mux audio and video streams with mencoder, since the mpeg muxer
> is bugged right now.
> Therefore, I encode the audio stream to AC3 using ffmpeg:
> ffmpeg -i movie.mov -ar 48000 -ab 384 movie.ac3
> I then multiplexed the audio and video streams with mplex:
> mplex -f 8 -V movie.ac3 movie.m2v -o movie.mpg
> The result is good, but you can get a better result with mpeg2enc in 5
> to 10 times less time...
>
> 2 - DIRECTLY EXPORTING TO MPEG2 FROM CINELERRA IS THE BEST SOLUTION
> -------------------------------------------------------------------
> I will continue to use the same method I used before, because that is
> how I get the best looking video. I directly convert the YUV4MPEG stream
> from Cinelerra with mpeg2enc using a pipe. Mpeg2enc is part of the
> mjpegtools suite. It produces a very good quality video, its syntax is
> simple and it's fast! =)
> # For interlaced:
> y4munsharp -L 1.0,0.2,0 | yuvmedianfilter -r 6 -T 3 \
> yuvcorrect -T INTERLACED_BOTTOM_FIRST | mpeg2enc -v 0 -r 32 -4 1 -2 1 -s
> -P -q4 -g 15 -G 15 -I 1 -B 384 -b 9800 -f 8 -o $1
> # For progressive:
> y4munsharp -L 1.0,0.2,0 | yuvmedianfilter -r 6 -T 3 \
> -t 0 | yuvcorrect -T NOT_INTERLACED | mpeg2enc -v 0 -r 32 -4 1 -2 1 \
> -s -P -q4 -g 15 -G 15 -I 0 -B 384 -b 9800 -f 8 -o $1
> That command line was made with suggestions from some of you on this
> mailing-list. =)
> I then export an AC3 sound file from cinelerra, and combine audio and
> video stream:
> mplex -f 8 -V -r 10286 audio.ac3 video.m2v -o audio_video.mpeg
> yuvcorrect is used in order to pass to mpeg2enc the good interlacing
> mode. That solves a bug of Cinelerra in batch rendering mode. (SVN
> version fetched in february 2006)
> The value of the -r parameter must be adjusted accordingly to the
> bitrates you use.
> I'm not sure one MUST set the video buffer (-b) in the mplex command
> line. On a DVD, I think the value is 1835 (that's what I read in the
> mencoder docs).
>
> 3 - ENCODING TO FLV FORMAT
> --------------------------
> I also encode the videos I make with Cinelerra into .flv files (FLash
> Video). The file weight is very small and the only thing needed to play
> the video is an internet browser and a flash plugin. That's the format I
> use when I want to display my video on an HTML page.
> ffmpeg -i movie.mov -b 430 -s 320x240 -aspect 4:3 -pass 1 -ar 22050
> movie.flv
> ffmpeg -i movie.mov -b 430 -s 320x240 -aspect 4:3 -pass 2 -ar 22050
> movie.flv
> Pay attention to the output file extension. It's read by ffmpeg to set
> the output format. ffmpeg can be used to convert videos into a lot of
> different formats such as mpeg, asf, avi, flv, quicktime, wmv... It uses
> the libavformat library.
>
> 4 - ENCODING A MOV VIDEO TO DIVX FORMAT
> ---------------------------------------
> To get a divx video, I first export my work from Cinelerra into a .mov
> file. I then use mencoder to convert it to Divx4/5 and AVI container.
> Two pass encoding is a MUST for that format. Parameters are set in order
> to get a good result at a "medium" bitrate. I set those parameters to
> get files small enough to be sent over the internet. For video who are 3
> minutes long, I get files whose weight is around 13Mo. If you want your
> divx video to be displayed properly on a stupid but well know media
> player which runs on Windows:
> - the aspect ratio information contained in the header won't be read by
> that player. That is why you really want to scale down the video in
> order for your video to be displayed with the good aspect ratio. Width
> and height must be multiples of 16. I recommend the following
> resolutions for a 4/3 PAL input video: 384:288, 448:336, 512:384,
> 704:528.
> - audio bitrate is CBR. Do not change it to VBR or that player would
> loose A/V sync
> - the -ffourcc parameter is needed for the video to be recognized as
> Divx
> Mencoder uses the libavcodec codecs.
> mencoder -oac pcm -sws 2 -vf scale=${width}:${height},hqdn3d=2:1:2 -ovc
> lavc -lavcopts vcodec=mpeg4:vbitrate=${video_bitrate}:vlelim=-4:\
> vcelim=7:lumi_mask=0.05:dark_mask=0.01:scplx_mask=0.3:naq:v4mv:\
> mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:aspect=4/3:sc_threshold=1000000000:\
> vmax_b_frames=2:vb_strategy=1:dia=3:predia=3:cbp:mv0:preme=2:\
> last_pred=3:vpass=1:psnr:cgop
> -ofps 25 -of avi movie.mov -o /dev/null -ffourcc DIVX
> mencoder -srate 32000 -oac mp3lame -lameopts cbr:br=${audio_bitrate}:\
> aq=0 -sws 2 -vf scale=${width}:${height},hqdn3d=2:1:2 -ovc lavc \
> -lavcopts vcodec=mpeg4:vbitrate=${video_bitrate}:vlelim=-4:vcelim=7:\
> lumi_mask=0.05:dark_mask=0.01:scplx_mask=0.3:naq:v4mv:mbd=2:trell:\
> cmp=3:subcmp=3:mbcmp=3:aspect=4/3:sc_threshold=1000000000:\
> vmax_b_frames=2:dia=3:predia=3:cbp:mv0:preme=2:last_pred=3:vpass=3:\
> psnr:cgop -ofps 25 -of avi movie.mov -o movie.avi -ffourcc DIVX
>
> 5 - CONCLUSION
> --------------
> My advices to get the best results when converting your videos made with
> Cinelerra are:
> - export as an YUV4MPEG stream and encode with mpeg2enc if you want a
> mpeg DVD format,
> - export as a .mov file (Quicktime DV+audio 2 complements) and use
> ffmpeg to encode your video into an "exotic" format,
> - export as a .mov file (Quicktime DV+audio 2 complements) and use
> mencoder if you want a Divx video.
>
> Your mileage may vary. I set the parameters and choose the right encoder
> for each task after reading a ton of documentation and runing a lot of
> tests. Do not hesitate to comment and share your encoding tips for
> cinelerra videos!
>
> Hope that helps. =)
> Nicolas, Paris.
>
> _______________________________________________
> Cinelerra mailing list
> [email protected]
> https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
_______________________________________________
Cinelerra mailing list
[email protected]
https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
