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#3 The Safest Place
16 octobre 2011, par
Mis à jour : Février 2013
Langue : English
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#1 The Wires
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ED-ME-5 1-DVD
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Mis à jour : Octobre 2011
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Revolution of Open-source and film making towards open film making
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Sur d’autres sites (9815)
-
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
-
Ffmpeg - Generate VTT File From Sprite, Using Spatial Media Fragment
20 octobre 2019, par DavidHi I am looking to create a .VTT file from a sprite that i have generated using Ffmpeg.
Ffmpeg command :
$"-i {inputMediaFile} -vf \"select = not(mod(n\\, 30)),scale = 120:80,tile = 7x7\" -an -vsync 0 {outputMediaFile}"
This selects every 30th frame, and then scales it to 120x80 pixels and creates 8x8 tiles in the output image.
I would like to make a .VTT from the generated image in C#, so i know the height and width of my individual images in the sprite (120x80) and there is 64 images in total in the output image.
From this i need to produce a VTT like this :
WEBVTT
1
00:00:00.000 --> 00:00:01.000
test-00001.jpg#xywh=0,0,120,80
2
00:00:01.000 --> 00:00:02.000
test-00001.jpg#xywh=120,0,120,80
3
00:00:02.000 --> 00:00:03.000
test-00001.jpg#xywh=240,0,120,80
4
00:00:03.000 --> 00:00:04.000
test-00001.jpg#xywh=360,0,120,80
5
00:00:04.000 --> 00:00:05.000
test-00001.jpg#xywh=480,0,120,80
6
00:00:05.000 --> 00:00:06.000
test-00001.jpg#xywh=600,0,120,80
7
00:00:06.000 --> 00:00:07.000
test-00001.jpg#xywh=720,0,120,80
8
00:00:07.000 --> 00:00:08.000
test-00001.jpg#xywh=840,0,120,80
9
00:00:08.000 --> 00:00:09.000
test-00001.jpg#xywh=0,80,120,80There is also situations when there is n amount of sprite files.
Im hoping there may be a library out there that can handle this, or even better if i can keep it contained within Ffmpeg - based on Ffmpeg docs i dont think this is possible though.
Thanks in advance if anyone as any ideas, its doable as ive seen Nodejs and Ruby examples.