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• How to merge .ts files from a DLINK security camera losslessly ?

  13 juin 2022, par anjchang

  I have >1000s of small .ts files from a DLINK camera of a theft that occured. I first tried to merge the ts files into bigger files so that I could look for the audio where the relevant event occurred. Then in Premiere I looked for the highest sustained audio peaks (it was someone using a saw to cut out a catalytic converter). Then, I isolated the relevant 200 files where things happened on the timeline. But now, I want to export the 20 minutes of the incident with the least compression (or no compression). Apparently Adobe Premiere can export the whole timeline containing these clips, but will compress them. I have not edited any of the files, so I don't want any rendering. I just want them strung together in a "well-known" format so I can send the files to the insurance company and authorities.

  


  I used an answer from here but there were audio gaps. Some of the files had no audio, causing the problem when I first merged the files with :

  


   for i in `\ls *.ts | sort -V`; do echo "file '$i'"; done >> mylist.txt;ffmpeg -f concat -i mylist.txt -c copy -bsf:a aac_adtstoasc video.mp4


  


• ffmpeg works with laptop webcam but not with android camera

  28 février 2023, par Rajkumar Somasundaram

  I am working on Macbook with M1 Chip with this ffmpeg version locally installed.

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers 
built with Apple clang version 14.0.0 (clang-1400.0.29.202)


  


  With this, I am able to use my laptop's webcam as input and do my ffmpeg work.

  


  Following command is what worked (avfoundation was needed for OSX)

  


  ffmpeg -f avfoundation -framerate 30 -i 0:0 \
-map 0:v:0 -map 0:a:0 \
-pix_fmt yuv420p \
-c:v libx264 -profile:v high \
-crf 32 -ar 44100 \
-c:a aac \
-filter:v:0 scale=w=480:h=360 \
-utc_timing_url "https://time.akamai.com/?iso" \
-segment_time 8 \
-f dash ${path.join(__dirname, "/output/sample.mpd")}


  


  Now, I am trying to use my android front camera as an input.

  


  But, it is not working. (Errors are mainly in & around camera_index)

  


  I am trying the following command and facing error.

  


  ffmpeg -f android_camera -camera_index 0 -framerate 30 -map 0:v -map 0:a -c:v\
libx264 -profile:v high -c:a aac -filter:v:0 scale=w=480:h=360 \
-utc_timing_url "https://time.akamai.com/?iso" -segment_time 8 \
-f dash ${path.join(__dirname, "/output/sample.mpd")}


  


  This is the stacktrace of the whole error log : https://www.diffchecker.com/Mnnghg7M/

  


  

  1. What is the correct command for android camera as input ?

  


  2. Do all stable versions of ffmpeg work with android or any limitations ?

  


  


• Use ffmpeg udp multicast to parse the external camera IP stream. On the iOS platform, cpu rises ? Hard decoding with videoToolBox sometimes fails

  25 février 2019, par AlfredFu

  I use the ffmpeg udp multicast function to connect an external camera on the iOS platform, use videoToolBox for hard decoding, and find that sometimes the decoding fails. The error that occurs in the successful callback is bad data error, cpu is a bit high, I don’t know what it is. Cause ? Have you encountered the same problem as me and solved it ? thank you very much