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Autres articles (30)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...) -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Sur d’autres sites (5098)
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GA360 vs GA4 : Key Differences and Challenges
20 mai 2024, par Erin -
ffmpeg mp4 to mp3 conversion generates 1 second audio files only [closed]
24 janvier 2024, par doesnotcompileI am having the following problem : I am having trouble converting an mp4 to an mp3.


I have mp4 audio recordings that I need to convert in to mp3 audio files. The mp4 files have been recorded on iOS.


I am currently doing this by using ffmpeg in python like so :


subprocess.run(
 [
 "ffmpeg",
 "-loglevel", "error",
 "-i", ,
 "-q:a", "0",
 "-map", "a",
 
 ]
 )



This runs with no error outputs.


However, the resulting mp3 is only 1 second long, even though the input mp4 is around 5 seconds long.


The mp4 is playable in Quicktime and Apple Music.


ffprobe output :


> ffprobe -v error -show_format input.mp4
[FORMAT]
filename=input.mp4
nb_streams=1
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=5.120000
size=119636
bit_rate=186931
probe_score=100
TAG:major_brand=iso5
TAG:minor_version=1
TAG:compatible_brands=isomiso5hlsf
TAG:creation_time=2024-01-24T12:47:24.000000Z
[/FORMAT]



No errors shown, and clearly 5 seconds long audio.


Has anyone else experienced similar issues before ?


Happy about any pointers !


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libavformat : add RCWT closed caption muxex
14 janvier 2024, par Marth64libavformat : add RCWT closed caption muxex
Signed-off-by : Marth64 <marth64@proxyid.net>
Raw Captions With Time (RCWT) is a format native to ccextractor, a commonly
used open source tool for processing 608/708 closed caption (CC) sources.
It can be used to archive the original, raw CC bitstream and to produce
a source file file for later CC processing or conversion. As a result,
it also allows for interopability with ccextractor for processing CC data
extracted via ffmpeg. The format is simple to parse and can be used
to retain all lines and variants of CC.A free specification of RCWT can be found here :
https://github.com/CCExtractor/ccextractor/blob/master/docs/BINARY_FILE_FORMAT.TXT
This muxer implements the specification as of 01/05/2024, which has
been stable and unchanged for 10 years as of this writing.This muxer will have some nuances from the way that ccextractor muxes RCWT.
No compatibility issues when processing the output with ccextractor
have been observed as a result of this so far, but mileage may vary
and outputs will not be a bit-exact match.Specifically, the differences are :
(1) This muxer will identify as "FF" as the writing program identifier, so
as to be honest about the output's origin.(2) ffmpeg's MPEG-1/2, H264, HEVC, etc. decoders extract closed captioning
data differently than ccextractor from embedded SEI/user data.
For example, DVD captioning bytes will be translated to ATSC A53 format.
This allows ffmpeg to handle 608/708 in a consistant way downstream.
This is a lossless conversion and the meaningful data is retained.(3) This muxer will not alter the extracted data except to remove invalid
packets in between valid CC blocks. On the other hand, ccextractor
will by default remove mid-stream padding, and add padding at the end
of the stream (in order to convey the end time of the source video).