[FFmpeg-user] Remuxing Into "aivx" MOV

[Bryce McLeod]

Hi Vincent,
  I'm afraid I don't know why you are getting a weird avg_frame_rate, I
just tried remuxing a 24fps video (not xavc) using ffmpeg and
-video_track_timescale of 24000, ffprobe reports the output as having an
avg_frame_rate=24/1

Regards


On Wed, Mar 12, 2014 at 1:46 PM, Vincent Olivier <vincent at up4.com> wrote:

> Hi Bryce,
>
> Thanks! It works with: av_opt_set_int(ofmt_ctx->priv_data,
> "video_track_timescale", in_stream->time_base.den, 0);
>
> But: the FCPX-remuxed file (my reference) has a time_base.den 1000 times
> the value of the original (1/24000). If I set that value for the
> "video_track_timescale", I get weird values for the avg_frame_rate equals
> to 24.01FPS). Is there a way to avoid that? For now I'll leave it at that
> because it seems a definite progress over what I was getting before, but
> I'm just curious.
>
> Thanks!
>
> Vincent
>
> On Mar 12, 2014, at 9:04 AM, Bryce McLeod <bryce.mcleod at codory.com> wrote:
>
> > For 1) you can stop the mov muxer changing the time base by using its
> > -video_track_timescale option, eg for 24fps content:
> >
> > ffmpeg -i in.mxf -vcodec copy -acodec copy -f mov -video_track_timescale
> 24
> > out.mov
> >
> > Regards
> >
> > On Wed, Mar 12, 2014 at 12:53 PM, Vincent Olivier <vincent at up4.com>
> wrote:
> >
> >> Hi,
> >>
> >> Starting from Stefano Sabatini's remuxin.c, I'm trying to remux an XAVC
> >> video stream (AVC/H.264 High 4:2:2 Intra 10-bit) from a MXF file into a
> MOV
> >> file made to look like the output of FCPX's own remuxing of the same
> source
> >> file (codec tag "aivx"). Specifically, using the ffprobe -show_data
> >> -show_streams command. I can see that there are still a couple of
> important
> >> differences between what I can get with FFMPEG and the file produced by
> >> FCPX (Final Cut Pro X 10.1). No matter what I try, it seems that the MOV
> >> FFMPEG "format" remangles those values after I have specifically set
> them.
> >> Namely, all for the video stream:
> >>
> >> 1) time_base: I'm setting 1/24000 and I'm getting 1/12288
> >>
> >> 2) extradata: here, I'm getting something mangled beyond recognition
> after
> >> explicitly setting the target metadata to the source metadata with this
> >> code:
> >>
> >>        out_stream->codec->extradata = in_stream->codec->extradata;
> >>        out_stream->codec->extradata_size =
> >> in_stream->codec->extradata_size;
> >>
> >> The other values (avg_frame_rate, duration, duration_ts) all seem to be
> >> calculated from the time_base, so I will stick to those two for now.
> How to
> >> deterministically set those values for a AVC/H.264 video stream to be
> muxed
> >> into a MOV file with FFMPEG?
> >>
> >> Thanks!
> >>
> >> Vincent
> >>
> >> Here is the FFMPEG version I'm using on Mac OS X 10.9.2:
> >>
> >> ffmpeg version 2.1.git-ffb7d71
> >> built on Mar  4 2014 08:48:40 with Apple LLVM version 5.0
> (clang-500.2.79)
> >> (based on LLVM 3.3svn)
> >> configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
> >> --enable-avresample --enable-libmp3lame --enable-libvorbis
> --enable-libopus
> >> --enable-libtheora --enable-libschroedinger --enable-libopenjpeg
> >> --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass
> >> --enable-libbluray --enable-gnutls --enable-fontconfig
> --enable-libfreetype
> >> --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man
> >> --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64
> >> --enable-yasm --enable-gpl --enable-postproc --enable-libx264
> >> --enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac
> >> libavutil      52. 66.100 / 52. 66.100
> >> libavcodec     55. 52.102 / 55. 52.102
> >> libavformat    55. 33.100 / 55. 33.100
> >> libavdevice    55. 10.100 / 55. 10.100
> >> libavfilter     4.  2.100 /  4.  2.100
> >> libavresample   1.  2.  0 /  1.  2.  0
> >> libswscale      2.  5.101 /  2.  5.101
> >> libswresample   0. 18.100 /  0. 18.100
> >> libpostproc    52.  3.100 / 52.  3.100
> >> _______________________________________________
> >> ffmpeg-user mailing list
> >> ffmpeg-user at ffmpeg.org
> >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >>
> >>
> >
> >
> > --
> > Bryce McLeod
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
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>



-- 
Bryce McLeod