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• dashenc : Write segment timelines properly if the timeline has gaps

  28 novembre 2014, par Martin Storsjö

  dashenc : Write segment timelines properly if the timeline has gaps
  Write a new start time if the duration of the previous segment
  
  didn’t match the start of the next one. Check that segments
  
  actually are continuous before writing a repeat count.
  This makes sure timestamps deduced from the timeline actually
  
  match the real start timestamp as written in filenames (if
  
  using a template containing $Time$).
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/dashenc.c

• How can I sync the frames of multiple videos from a multi-camera capture system using FFMPEG

  9 février 2023, par user9114146

  I have a multi-camera capture setup with 2 canon cameras. Each of these cameras have a tentacle sync e timecode generator connected to them.

  


  After a video capture with these 2 cameras, the generated timecode (SMPTE format) is stored in the video files metadata.

  


  It looks like this 00:00:53;30

  


  Is there a bash script that uses FFmpeg to trim the start time of the video that started earlier (based on timecode) to match the other and then trim the end time of the video that ended last to match the one that ended first ?

  


  The two trimmed output videos should be synced based on the timecode and have the same duration.

  


  So far, my bash script looks like this :

  


  file1="A001C002_220101EB_CANON.MXF"
file2="A001C002_220101US_CANON.MXF"

# Get the SMPTE timecodes of the two files
timecode1=$(ffmpeg -i "$file1" 2>&1 | sed -n 's/timecode.*: \(.*\)/\1/p')
timecode2=$(ffmpeg -i "$file2" 2>&1 | sed -n 's/timecode.*: \(.*\)/\1/p')

# Convert the SMPTE timecode to start time in seconds
start_time_1=$(echo "$timecode1" | awk -F ':' '{print 3600*$1 + 60*$2 + $3}')
start_time_2=$(echo "$timecode2" | awk -F ':' '{print 3600*$1 + 60*$2 + $3}')

# Trim the start of the video with the earlier start timecode so that both videos have the same start time
if [ "$start_time_1" -lt "$start_time_2" ]; then
  ffmpeg -i "$file1" -ss "$start_time_2" -c:v libx264 -crf 18 -preset veryfast trimmed_file1.mp4
  ffmpeg -i "$file2" -c:v libx264 -crf 18 -preset veryfast trimmed_file2.mp4
else
  ffmpeg -i "$file2" -ss "$start_time_1" -c:v libx264 -crf 18 -preset veryfast trimmed_file2.mp4
  ffmpeg -i "$file1" -c:v libx264 -crf 18 -preset veryfast trimmed_file1.mp4
fi

# Get the duration of both files
duration_1=$(ffmpeg -i trimmed_file1.mp4 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//)
duration_2=$(ffmpeg -i trimmed_file2.mp4 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//)

# Convert the duration to seconds
duration_1_secs=$(echo $duration_1 | awk -F: '{ print ($1 * 3600) + ($2 * 60) + $3 }')
duration_2_secs=$(echo $duration_2 | awk -F: '{ print ($1 * 3600) + ($2 * 60) + $3 }')

# Trim the end time of the video that ended last to match the one that ended first
if [ "$duration_1_secs" -gt "$duration_2_secs" ]; then
  echo "Trimming end time of file1 to match file2"
  ffmpeg -i trimmed_file1.mp4 -t "$duration_2" -c:v libx264 -c:a aac trimmed_file1.mp4
else
  echo "Trimming end time of file2 to match file1"
  ffmpeg -i trimmed_file2.mp4 -t "$duration_1" -c:v libx264 -c:a aac trimmed_file2.mp4
fi


  


  But this does not make the videos have matching frames.

  


  Thanks !

  


• Downloading and Uploading FFmpeg [closed]

  24 décembre 2011, par user705339

  I have a Windows OS for development, and a Linux server. I downloaded ffmpeg on my Windows, configured everything, and uploaded the application. The video conversion didn't work. After extensive hours figuring out the culprit, I realized that I downloaded the ffmpeg for Windows, and need to download the Linux version. That seemed harder than downloading the Windows version. I have scoured the net, and have come up with squat

  So, my 2 questions are :

  1. Is there an easy way to download/install the linux version of ffmpeg ? OR
  2. Is there an easier way to install it straight on the server ?

  If it matters, I also have a Linux OS development, but found it hard to install ffmpeg on it anyway.

  Update : After trying apt-get install ffmpeg on my Ubuntu Linux OS, it says it has already been installed. How do I locate what folder it's located ?