[FFmpeg-user] -movflags faststart revisited

Mon Feb 27 00:32:11 EET 2017

Thanx.
Are there any flags that will let me playback an unfinished transcode?
Reason I am asking is that if my various options in the transcode command
did not yield what I like, then I would like to abort the transcode.

Kind regards,

JD

On Sat, Feb 25, 2017 at 9:28 PM, Geek.Song <ffmpeg at gmail.com> wrote:

> On Sun, Feb 26, 2017 at 11:28 AM, JD <jd1008 at gmail.com> wrote:
> > I retried to use this flag as it was indicated in a previous response by
> a
> > user.
> > Sorry that I was unable to continue on the original thread, because the
> > gmail web
> > interface deletes original message sent to this list by the OP, when the
> OP
> > deletes the
> > response from the list.
> >
> > So, even though I corrected the usage of the flag, I am still unable to
> > play the output
> > file before ffmpeg finishes the transcoding :( :(
>
> '-movflags faststart'  will just move the header information from file
> bottom to file top, it is only take effect after you have finished
> encoding/muxing.
>
> So you can not use this flag  in real time encoding and playback.
>
> >
> > $ ~/bin/ffmpeg.d/ffmpeg -i video_Z11.mp4 -movflags faststart -vb 8000k
> -ab
> > 384k -s 1920x1080 -y video_Z11-1920x1080.mp4
> > ffmpeg version 3.2.4-static http://johnvansickle.com/ffmpeg/  Copyright
> (c)
> > 2000-2017 the FFmpeg developers
> >   built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
> >   configuration: --enable-gpl --enable-version3 --enable-static
> > --disable-debug --disable-ffplay --disable-indev=sndio
> > --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r
> > --enable-gnutls --enable-gray --enable-libass --enable-libfreetype
> > --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb
> > --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus
> > --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora
> > --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis
> > --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
> > --enable-libxvid --enable-libzimg
> >   libavutil      55. 34.101 / 55. 34.101
> >   libavcodec     57. 64.101 / 57. 64.101
> >   libavformat    57. 56.101 / 57. 56.101
> >   libavdevice    57.  1.100 / 57.  1.100
> >   libavfilter     6. 65.100 /  6. 65.100
> >   libswscale      4.  2.100 /  4.  2.100
> >   libswresample   2.  3.100 /  2.  3.100
> >   libpostproc    54.  1.100 / 54.  1.100
> > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video_Z11.mp4':
> >   Metadata:
> >     major_brand     : isom
> >     minor_version   : 512
> >     compatible_brands: isomiso2avc1mp41
> >     creation_time   : 2016-11-29T13:42:34.000000Z
> >     encoder         : Lavf56.1.0
> >   Duration: 02:22:55.48, start: 0.000000, bitrate: 379 kb/s
> >     Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p,
> > 480x360 [SAR 1:1 DAR 4:3], 246 kb/s, 29.95 fps, 29.97 tbr, 90k tbn, 59.91
> > tbc (default)
> >     Metadata:
> >       creation_time   : 2016-11-29T13:42:34.000000Z
> >       handler_name    : VideoHandler
> >     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
> > stereo, fltp, 125 kb/s (default)
> >     Metadata:
> >       creation_time   : 2016-11-29T13:42:34.000000Z
> >       handler_name    : SoundHandler
> > [libx264 @ 0x5a3c240] using SAR=3/4
> > [libx264 @ 0x5a3c240] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
> > [libx264 @ 0x5a3c240] profile High, level 4.0
> > [libx264 @ 0x5a3c240] 264 - core 148 r333 90a61ec - H.264/MPEG-4 AVC
> codec
> > - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options:
> cabac=1
> > ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
> psy_rd=1.00:0.00
> > mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0
> deadzone=21,11
> > fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1
> > sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
> > constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1
> > weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40
> > intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=8000 ratetol=1.0
> > qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
> > Output #0, mp4, to 'video_Z11-1920x1080.mp4':
> >   Metadata:
> >     major_brand     : isom
> >     minor_version   : 512
> >     compatible_brands: isomiso2avc1mp41
> >     encoder         : Lavf57.56.101
> >     Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021),
> > yuv420p, 1920x1080 [SAR 3:4 DAR 4:3], q=-1--1, 8000 kb/s, 29.97 fps, 30k
> > tbn, 29.97 tbc (default)
> >     Metadata:
> >       creation_time   : 2016-11-29T13:42:34.000000Z
> >       handler_name    : VideoHandler
> >       encoder         : Lavc57.64.101 libx264
> >     Side data:
> >       cpb: bitrate max/min/avg: 0/0/8000000 buffer size: 0 vbv_delay: -1
> >     Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz,
> > stereo, fltp, 384 kb/s (default)
> >     Metadata:
> >       creation_time   : 2016-11-29T13:42:34.000000Z
> >       handler_name    : SoundHandler
> >       encoder         : Lavc57.64.101 aac
> > Stream mapping:
> >   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
> >   Stream #0:1 -> #0:1 (aac (native) -> aac (native))
> > Press [q] to stop, [?] for help
> > _______________________________________________
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> >
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