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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
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Autres articles (108)
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Sur d’autres sites (7078)
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Reading subtitle metadata from mpeg files using ffprobe
26 septembre 2022, par Kaydee DunlopI'm using ffmpeg or to be more specific ffprobe which is part of the ffmpeg toolstack to read subtitle information from a mpeg file. Anyway, I'm facing an issue I currently don't fully understand. If I use the following command :


ffprobe -of json -show_streams -show_format



I get back something like this :


{
 "index": 6,
 "codec_name": "mov_text",
 "codec_long_name": "MOV text",
 "codec_type": "subtitle",
 "codec_tag_string": "tx3g",
 "codec_tag": "0x67337874",
 "width": 3840,
 "height": 240,
 "id": "0x6",
 "r_frame_rate": "0/0",
 "avg_frame_rate": "0/0",
 "time_base": "1/1000",
 "start_pts": 0,
 "start_time": "0.000000",
 "duration_ts": 6706616,
 "duration": "6706.616000",
 "bit_rate": "95",
 "nb_frames": "4028",
 "extradata_size": 48,
 "disposition": {
 "default": 0,
 "dub": 0,
 "original": 0,
 "comment": 0,
 "lyrics": 0,
 "karaoke": 0,
 "forced": 0,
 "hearing_impaired": 0,
 "visual_impaired": 0,
 "clean_effects": 0,
 "attached_pic": 0,
 "timed_thumbnails": 0,
 "captions": 0,
 "descriptions": 0,
 "metadata": 0,
 "dependent": 0,
 "still_image": 0
 },
 "tags": {
 "creation_time": "2022-09-11T01:02:33.000000Z",
 "language": "eng"
 }
 },



you can see, I have several options that can be set for the disposition section, I'm especially interested in "forced" and "hearing_impaired". To set the value for these options I'm trying to use a tool called "Subler" which is a tool to metarise mpeg files and their containing tracks. But for some reason, ffprobe does not seem to match with the fields Subler sets... So I'm kind stuck as I'm never really able to find out if a subtitle track is forced, hearing_impaired (SDH) etc. Is there any kind of workaround for this problem, maybe an extra option I have to set with ffprobe or so ? Is there maybe an alternative tool that can ?


If you are more interested into this issue I also uploaded a test scenario which has forced subtitles, normal subtitles and SDH subtitles properly set, it also contains screenshots and the raw SRT files, which are basically not needed as the subs are already embedded into the mp4 file, but just in case I also attached them.


https://drive.google.com/file/d/1ZZ32i17A33Lhpn4a5BDg033yV9PbZhtS/view?usp=sharing


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How Can i Download this video ? Encrypted m3u8 ?
16 septembre 2022, par אורן NOHello everyone For almost a whole month now I have been trying to download a file from a specific site


This is the link to the video
https://www.karaoke.co.il/api_play.php?type=clip&id=58370&autoplay=undefined&referer=karaoketv


The M3u8 files are split into 2 parts.


Video file
https://www.video-cdn.com/video/encrypt/750802ea0bc2d02fac93adeaa1398ec2/750802ea0bc2d...2-57d9518fae69


And an audio file
https://www.video-cdn.com/video/encrypt/750802ea0bc2d02fac93adeaa1398ec2/750802ea0bc2d...2-57d9518fae69


As far as I know there is a Key that needs to be entered in order to download the file.


And when I run the command in ffmpeg


I encounter many errors like :
Unable to open key file


Anyone who can download it.
I would be very happy if he would write me a code that works and explain to me how to do it


These are all the codes I have already tried


ffmpeg -decryption_key https://www.video-cdn.com/video/key/750802ea0bc2d02fac93adeaa13cde64 -i https://www.video-cdn.com/video/encrypt/750802ea0bc2d02fac93adeaa1398ec2/750802ea0bc2d02fac93adeaa1398ec2/video_720p.m3u8?token=R915dD-72351a7c-3dd1-4e58-b6c2-9cc813eeb183 -vcodec libx264 {output_file}



ffmpeg -decryption_key key -i file -max_muxing_queue_size 9999 d.mp4


ffmpeg -allowed_extensions ALL -protocol_whitelist data, file, http, https, tcp, tls, crypto -i "https://www.video-cdn.com/video/encrypt/f242d2da41d03b3955fb866efc5dbd59/f242d2da41d03b3955fb866efc5dbd59/video_720p.m3u8?token=R915dD-a1430cfc-0bda-46a0-a7e9-b15308875dc7" c copy -bsf : a aac_adtstoasc test.mp4 -decryption_key C :\ ffmpeg\enc.key


hlsdl -K "1a9625fb34a4afe0d5446138e9543563" https://www.video-cdn.com/video/encrypt/f242d2da41d03b3955fb866efc5dbd59/f242d2da41d03b3955fb866efc5dbd59/video_720p.m3u8?token=R915dD-be07b7e6-08aa-441b-afbd-5c7876409878




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ffmpeg - Determine what parameters
27 juin 2018, par AdmiralJonBI’ve got a video file that I’m trying to determine what parameters I can use to reproduce the encoding with ffmpeg.
Here’s the ffprobe of the particular stream in question.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.51.107
Duration: 00:05:02.84, start: 0.000000, bitrate: 4324 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4323 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default)
Metadata:
handler_name : VideoHandlerThe key part is that I’m noticing that the bitrate is quite low at 4324 kb/s, but this is actually an incredibly high quality video. To approach this sort of quality, I’ve only been able to make videos at 40000 kb/s (which is a huge increase in filesize). I also notice that it mentions yuvj420p which is an image format, but I have no idea what parameters with ffmpeg could produce that image format (if this at all would make a difference).
Would appreciate any help I can get.
Edit :
Here’s the output based on the comment below :
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=Main
codec_type=video
codec_time_base=123187/3701760
codec_tag_string=avc1
codec_tag=0x31637661
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuvj420p
level=41
color_range=pc
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=center
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=15/1
avg_frame_rate=1850880/123187
time_base=1/15360
start_pts=0
start_time=0.000000
duration_ts=246374
duration=16.039974
bit_rate=13795677
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=241
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=und
TAG:handler_name=VideoHandler
[/STREAM]Edit 2 :
Here’s information from mediainfo
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.1
Format settings, CABAC : Yes
Format settings, RefFrames : 1 frame
Format settings, GOP : M=1, N=32
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5 min 2 s
Bit rate : 4 323 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.083
Stream size : 156 MiB (100%)
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709