[Libav-user] How to specify output format
jim morgenstern
jmorgie at yahoo.com
Tue Jan 22 00:31:11 CET 2013
One [last] question:
My 3 band image is in YUV422 pixel format so its in three 2D arrays . . .
is the CodecID still RAWIMAGE or is there a better or correct choice ?
jm
> -----Original Message-----
> From: libav-user-bounces at ffmpeg.org [mailto:libav-user-bounces at ffmpeg.org]
> On Behalf Of Paul B Mahol
> Sent: Monday, January 21, 2013 3:54 PM
> To: This list is about using libavcodec, libavformat, libavutil,
libavdevice and
> libavfilter.
> Subject: Re: [Libav-user] How to specify output format
>
> On 1/21/13, jim morgenstern <jmorgie at yahoo.com> wrote:
> > So this is the piece to the puzzle I am missing:
> >
> > * where does one set the output pixel format / video codec to
> > CODEC_ID_RAWVIDEO ?
> > I have
> >> > m_pOutputFormat = av_guess_format(NULL, filename, NULL);
> >> > m_pFormatContext = avformat_alloc_context();
> >> > m_pFormatContext->oformat = m_pOutputFormat;
> >
> > So after I get a format context then I can go in and tweak the various
> > fields?
>
> m_pFormatContext->oformat->video_codec = CODEC_ID_RAWVIDEO.
>
> When initialzing encoder you specify pix_fmt: example:
> avctx->pix_fmt = PIX_FMT_YUV420P;
>
> There is example code:
>
> http://git.videolan.org/?p=ffmpeg.git;a=blob;f=doc/examples/muxing.c
>
> > Sure wish someone would write a book
> >
> > Thanks
> >
> >
> >
> >> -----Original Message-----
> >> From: libav-user-bounces at ffmpeg.org
> >> [mailto:libav-user-bounces at ffmpeg.org]
> >> On Behalf Of Paul B Mahol
> >> Sent: Monday, January 21, 2013 1:06 PM
> >> To: This list is about using libavcodec, libavformat, libavutil,
> > libavdevice and
> >> libavfilter.
> >> Subject: Re: [Libav-user] How to specify output format
> >>
> >> On 1/21/13, jim morgenstern <jmorgie at yahoo.com> wrote:
> >> > Paul -- couple of problems
> >> >
> >> > I did as you suggested and specified the output file as: *.nut
> >> > ** ffmpeg associates the MPEG4 codec with this output and I want
> >> > uncompressed
> >> > ** the audio stream bombs
> >> >
> >> > Thanks for any help you can provide
> >>
> >> I said you must set video codec to rawvideo aka CODEC_ID_RAWVIDEO.
> >>
> >> >
> >> > Here is a code snippet, then screen output from ffmpeg:
> >> > =========
> >> >
> >> > m_pOutputFormat = av_guess_format(NULL, filename, NULL);
> >> > m_pFormatContext = avformat_alloc_context();
> >> > m_pFormatContext->oformat = m_pOutputFormat;
> >> > _snprintf_s(m_pFormatContext->filename,
> >> > sizeof(m_pFormatContext->filename), "%s", filename);
> >> >
> >> > // add the audio and video streams using the default format codecs
> >> > and initialize the codecs.
> >> > m_pAudioStream = NULL;
> >> > if (m_pOutputFormat->audio_codec != CODEC_ID_NONE)
> >> > {
> >> > m_pAudioStream = add_audio_stream(m_pFormatContext,
> >> > m_pOutputFormat->audio_codec, channels);
> >> > }
> >> > // and the abort comes from add_audio_stream
> ==================
> >> >
> >> > Starting MediaFileIO for D:\Data\Solavei.mov
> >> >
> >> > [mov,mp4,m4a,3gp,3g2,mj2 @ 00ad3320] Stream #1: not enough frames
> >> > to estimate ra te; consider increasing probesize
> >> > [mov,mp4,m4a,3gp,3g2,mj2 @ 00ad3320] Stream #2: not enough frames
> >> > to estimate ra te; consider increasing probesize
> >> >
> >> > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Data\Solavei.mov':
> >> > Metadata:
> >> > major_brand : qt
> >> > minor_version : 537199360
> >> > compatible_brands: qt
> >> > creation_time : 2012-07-12 23:41:43
> >> > Duration: 00:00:11.81, start: 0.000000, bitrate: 598161 kb/s
> >> > Stream #0:0(eng): Video: v210 (v210 / 0x30313276), yuv422p10le,
> >> > 1280x720, 59
> >> > 6600 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc
> >> > Metadata:
> >> > creation_time : 2012-07-12 23:41:43
> >> > handler_name : Apple Alias Data Handler
> >> > Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000
> >> > Hz, stereo, s1 6, 1536 kb/s
> >> > Metadata:
> >> > creation_time : 2012-07-12 23:41:43
> >> > handler_name : Apple Alias Data Handler
> >> > Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
> >> > Metadata:
> >> > creation_time : 2012-07-12 23:42:01
> >> > handler_name : Apple Alias Data Handler
> >> > timecode : 00:00:28;11
> >> >
> >> >
> >> > Starting MediaFileIO for => D:\Data\TestSol.nut Output #0, nut, to
> >> > 'D:\Data\TestSol.nut':
> >> > Stream #0:0: Video: mpeg4, yuv420p, 1280x720, q=2-31, 5942
> >> > kb/s, 90k tbn, 29 tbc
> >> > Stream #0:1: Audio: vorbis, 44100 Hz, 1 channels, s16, 64 kb/s
> >> > [libvorbis @ 054e20c0] Specified sample_fmt is not supported.
> >> >
> >> > File Initialization Exception: output !!
> >> > MediaFileWriter::open_audio: Could not open audio codec //this is
my
> > app
> >> > error message
> >>
> >> You want to store audio? If yes. What codec?
> >>
> >>
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >> -----Original Message-----
> >> >> From: libav-user-bounces at ffmpeg.org
> >> >> [mailto:libav-user-bounces at ffmpeg.org]
> >> >> On Behalf Of Paul B Mahol
> >> >> Sent: Monday, January 21, 2013 11:26 AM
> >> >> To: This list is about using libavcodec, libavformat, libavutil,
> >> > libavdevice and
> >> >> libavfilter.
> >> >> Subject: Re: [Libav-user] How to specify output format
> >> >>
> >> >> On 1/21/13, jim morgenstern <jmorgie at yahoo.com> wrote:
> >> >> > Paul
> >> >> > Thanks for the specifics. I don't like headerless so .raw and
> >> >> > .yuv are out.
> >> >> >
> >> >> > Hadn't heard of .nut; I don't understand your comment about
> >> >> > -vcodec
> >> > etc.
> >> >> > I am writing a C++ app not using the command line utilities.
> >> >>
> >> >> I mean video codec should be set to rawvideo. And pixel format for
> >> >> that
> >> > codec
> >> >> should be same as one detected in input.
> >> >>
> >> >> >
> >> >> > So what all do I need to know about .nut? Googled but cannot
> >> >> > find any definitions or spec for the file. Can you send a url?
> >> >>
> >> >> You really should not need know anything, you just set output
> >> >> format to
> >> > nut and
> >> >> it is all what is needed. I doubt you want nut spec if you gonna
> >> >> use
> >> > libavformat to
> >> >> read nut files.
> >> >>
> >> >> >
> >> >> >
> >> >> >
> >> >> >> -----Original Message-----
> >> >> >> From: libav-user-bounces at ffmpeg.org
> >> >> >> [mailto:libav-user-bounces at ffmpeg.org]
> >> >> >> On Behalf Of Paul B Mahol
> >> >> >> Sent: Monday, January 21, 2013 10:41 AM
> >> >> >> To: This list is about using libavcodec, libavformat,
> >> >> >> libavutil,
> >> >> > libavdevice and
> >> >> >> libavfilter.
> >> >> >> Subject: Re: [Libav-user] How to specify output format
> >> >> >>
> >> >> >> On 1/21/13, jim morgenstern <jmorgie at yahoo.com> wrote:
> >> >> >> > So what Specifically is the specific format extension that I
> >> >> >> > give to ffmpeg that gives me the "raw video format" you cited?
> >> >> >>
> >> >> >> Headerless : .raw, .yuv (You need to remember pixel format and
> >> >> >> dimensions stored in it)
> >> >> >>
> >> >> >> With headers : .nut (You must use -vcodec rawvideo and -pix_fmt
> >> >> >> same as
> >> >> > your
> >> >> >> input video
> >> >> >> to keep video uncompressed)
> >> >> >> There are others like .avi, .. but they may not support
> >> >> >> pixel format
> >> >> > of your
> >> >> >> input video.
> >> >> >>
> >> >> >> >
> >> >> >> >> -----Original Message-----
> >> >> >> >> From: libav-user-bounces at ffmpeg.org
> >> >> >> >> [mailto:libav-user-bounces at ffmpeg.org]
> >> >> >> >> On Behalf Of Paul B Mahol
> >> >> >> >> Sent: Monday, January 21, 2013 9:50 AM
> >> >> >> >> To: This list is about using libavcodec, libavformat,
> >> >> >> >> libavutil,
> >> >> >> > libavdevice and
> >> >> >> >> libavfilter.
> >> >> >> >> Subject: Re: [Libav-user] How to specify output format
> >> >> >> >>
> >> >> >> >> On 1/21/13, jim morgenstern <jmorgie at yahoo.com> wrote:
> >> >> >> >> >>> where can I find the list of formats and their extensions?
> >> >> >> >> >> In the source code
> >> >> >> >> >
> >> >> >> >> > Yes but the source code is hundreds of files; can you
> >> >> >> >> > tell me which one has the list and the mapping?
> >> >> >> >> >
> >> >> >> >> >
> >> >> >> >> >> > . What is your recommended format for uncompressed
> HD
> >> >> video
> >> >> > ?
> >> >> >> >> >>
> >> >> >> >> >> libx264 is the state of the art encode
> >> >> >> >> >
> >> >> >> >> > But I do not want any encoding or compression: I want
> >> >> >> >> > flat file that can be read later on for more processing.
> >> >> >> >> > So is there a recommendation for a particular file format
> >> >> >> >> > that does
> > this?
> >> >> >> >>
> >> >> >> >> Depends on what you gonna use for more processing later.
> >> >> >> >> Depending on available storage and CPU speed you could use
> >> >> >> >> raw video formats...
> >> >> >> >>
> >> >> >> >> >
> >> >> >> >> >
> >> >> >> >> >
> >> >> >> >> >
> >> >> >> >> >> -----Original Message-----
> >> >> >> >> >> From: libav-user-bounces at ffmpeg.org
> >> >> >> >> >> [mailto:libav-user-bounces at ffmpeg.org]
> >> >> >> >> >> On Behalf Of Stefano Sabatini
> >> >> >> >> >> Sent: Monday, January 21, 2013 7:50 AM
> >> >> >> >> >> To: This list is about using libavcodec, libavformat,
> >> >> >> >> >> libavutil,
> >> >> >> >> > libavdevice and
> >> >> >> >> >> libavfilter.
> >> >> >> >> >> Subject: Re: [Libav-user] How to specify output format
> >> >> >> >> >>
> >> >> >> >> >> In data Saturday 2013-01-19 01:55:22 -0500, Jim
> >> >> >> >> >> Morgenstern ha
> >> >> >> >> >> scritto:
> >> >> >> >> >> > I have C++ app [win 7] that is reading and writing
> >> >> >> >> >> > video/audio
> >> >> >> > stream.
> >> >> >> >> >> >
> >> >> >> >> >> >
> >> >> >> >> >> >
> >> >> >> >> >> > When I specify the output file as xxxx.MOV I am getting
> >> >> >> >> >> > H264 compressed video at 24 fps.
> >> >> >> >> >> >
> >> >> >> >> >> >
> >> >> >> >> >> >
> >> >> >> >> >> > I want to have output as uncompressed at 30 or 60 fps
> >> >> >> >> >> > according to the input.
> >> >> >> >> >> >
> >> >> >> >> >> >
> >> >> >> >> >> >
> >> >> >> >> >> > Some simple [I hope] questions:
> >> >> >> >> >> >
> >> >> >> >> >> > . What is [where can I find] the mapping between
file
> >> > name
> >> >> >> >> > extension
> >> >> >> >> >> > and format used?
> >> >> >> >> >>
> >> >> >> >> >> In the source code, or you can show the ".extensions"
> >> >> >> >> >> field for all the
> >> >> >> >> > registered
> >> >> >> >> >> AVInput/OutputFormats.
> >> >> >> >> >>
> >> >> >> >> >> >
> >> >> >> >> >> > . Can I specify the output format I want rather
than
> >> > using
> >> >> >> >> >> > av_guess_format ? all the tutorials use guess
> >> >> >> >> >>
> >> >> >> >> >> Yes, you need to specify avformat_alloc_output_context2()
> >> >> >> >> >> and rely on oformat/format_name parameters, or use
> >> >> >> >> >> av_guess_format().
> >> >> >> >> >>
> >> >> >> >> >> >
> >> >> >> >> >> > . What is your recommended format for uncompressed
> HD
> >> >> video
> >> >> > ?
> >> >> >> >> >>
> >> >> >> >> >> libx264 is the state of the art encoder (but it has
> >> >> >> >> >> licensing
> >> >> >> >> > constraints).
> >> >> >> >> >> _______________________________________________
> >> >> >> >> >> Libav-user mailing list
> >> >> >> >> >> Libav-user at ffmpeg.org
> >> >> >> >> >> http://ffmpeg.org/mailman/listinfo/libav-user
> >> >> >> >> >
> >> >> >> >> > _______________________________________________
> >> >> >> >> > Libav-user mailing list
> >> >> >> >> > Libav-user at ffmpeg.org
> >> >> >> >> > http://ffmpeg.org/mailman/listinfo/libav-user
> >> >> >> >> >
> >> >> >> >> _______________________________________________
> >> >> >> >> Libav-user mailing list
> >> >> >> >> Libav-user at ffmpeg.org
> >> >> >> >> http://ffmpeg.org/mailman/listinfo/libav-user
> >> >> >> >
> >> >> >> > _______________________________________________
> >> >> >> > Libav-user mailing list
> >> >> >> > Libav-user at ffmpeg.org
> >> >> >> > http://ffmpeg.org/mailman/listinfo/libav-user
> >> >> >> >
> >> >> >> _______________________________________________
> >> >> >> Libav-user mailing list
> >> >> >> Libav-user at ffmpeg.org
> >> >> >> http://ffmpeg.org/mailman/listinfo/libav-user
> >> >> >
> >> >> > _______________________________________________
> >> >> > Libav-user mailing list
> >> >> > Libav-user at ffmpeg.org
> >> >> > http://ffmpeg.org/mailman/listinfo/libav-user
> >> >> >
> >> >> _______________________________________________
> >> >> Libav-user mailing list
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> >> >> http://ffmpeg.org/mailman/listinfo/libav-user
> >> >
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> >> >
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> >
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