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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
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Dans la rubrique "Champs à ajouter, cocher "Date de publication "
Cliquer en bas de la page sur Enregistrer -
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Revision 36889 : Le début d’une page d’info concernant la configuration de FFMPEG sur le ...
3 avril 2010, par kent1@… — LogLe début d’une page d’info concernant la configuration de FFMPEG sur le serveur.
On vire le PHP du squelette du formulaire de configuration
On prépare le passage aux pressets -
Matching a specific media format with ffmpeg/avconv
5 mai 2020, par Markus A.I need to encode a video from static images in such a way that it format-matches another one so I can splice the video streams together.



Here is the
mediainfo
of the file I'm trying to match :


Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : 7
Duration : 2mn 46s
Bit rate : 1 614 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Stream size : 32.0 MiB (87%)
Color primaries : BT.601 PAL
Transfer characteristics : BT.601
Matrix coefficients : BT.601




So far, what I have been able to come up with is the following :



avconv -f image2 -framerate 1.2 -i loop_%d.tif -c:v libx264 -preset veryslow -profile:v baseline -level:v 31 -b:v 1614K -refs 1 loop.flv




This gets me to :



Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : 7
Duration : 2s 917ms
Bit rate : 1 614 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 1.200 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.459
Stream size : 575 KiB
Writing library : x264 core 142 r2431 a5831aa
Encoding settings : cabac=0 / ref=1 / deblock=1:0:0 / analyse=0x1:0x131 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=abr / mbtree=1 / bitrate=1614 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00




Which, unfortunately, still isn't good enough as VLC Media Player crashes hard (just closes), logging
main error: Failed to compensate for the format changes, removing all filters; main error: Failed to create video converter
as soon as the stream splice occurs. I tried splicing another stream in that does have the exact same encoding, and it works fine. I'm also making sure to only splice on key-frames and I am including the NALU containing the AVCDecoderConfigRecord, so I'm pretty sure I'm not doing anything else wrong, especially since a couple other programs are fine with the splice. It's just VLC that expects an even closer match.


Here are things I've tried :



- 

- Adding
-vsync 2
to get variable frame rate mode. Doesn't change anything. - Adding
-color_primaries bt470bg -color_trc gamma28 -colorspace bt470bg
to try to get BT.601 PAL settings (several websites mentioned this). Doesn't change anything. - Adding
-s ntsc
to set the standard to NTSC. This also changes the resolution to 720x480 (not OK), and specifying-s 1280x720
in addition gets rid of the NTSC tag again.









If anyone knows what flags I need to supply to get closer, that would be super-helpful ! The stream I'm trying to match is encoded on an Android device (it's a live-stream), so I'm assuming it is built using the standard Android MediaCoder framework, in case that helps.


- Adding
-
Matching a specific media format with ffmpeg/avconv
5 mai 2020, par Markus A.I need to encode a video from static images in such a way that it format-matches another one so I can splice the video streams together.



Here is the
mediainfo
of the file I'm trying to match :


Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : 7
Duration : 2mn 46s
Bit rate : 1 614 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Stream size : 32.0 MiB (87%)
Color primaries : BT.601 PAL
Transfer characteristics : BT.601
Matrix coefficients : BT.601




So far, what I have been able to come up with is the following :



avconv -f image2 -framerate 1.2 -i loop_%d.tif -c:v libx264 -preset veryslow -profile:v baseline -level:v 31 -b:v 1614K -refs 1 loop.flv




This gets me to :



Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : 7
Duration : 2s 917ms
Bit rate : 1 614 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 1.200 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.459
Stream size : 575 KiB
Writing library : x264 core 142 r2431 a5831aa
Encoding settings : cabac=0 / ref=1 / deblock=1:0:0 / analyse=0x1:0x131 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=abr / mbtree=1 / bitrate=1614 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00




Which, unfortunately, still isn't good enough as VLC Media Player crashes hard (just closes), logging
main error: Failed to compensate for the format changes, removing all filters; main error: Failed to create video converter
as soon as the stream splice occurs. I tried splicing another stream in that does have the exact same encoding, and it works fine. I'm also making sure to only splice on key-frames and I am including the NALU containing the AVCDecoderConfigRecord, so I'm pretty sure I'm not doing anything else wrong, especially since a couple other programs are fine with the splice. It's just VLC that expects an even closer match.


Here are things I've tried :



- 

- Adding
-vsync 2
to get variable frame rate mode. Doesn't change anything. - Adding
-color_primaries bt470bg -color_trc gamma28 -colorspace bt470bg
to try to get BT.601 PAL settings (several websites mentioned this). Doesn't change anything. - Adding
-s ntsc
to set the standard to NTSC. This also changes the resolution to 720x480 (not OK), and specifying-s 1280x720
in addition gets rid of the NTSC tag again.









If anyone knows what flags I need to supply to get closer, that would be super-helpful ! The stream I'm trying to match is encoded on an Android device (it's a live-stream), so I'm assuming it is built using the standard Android MediaCoder framework, in case that helps.


- Adding