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• dpxenc : enforce alignment requirement

  13 août 2014, par Christophe Gisquet

  dpxenc : enforce alignment requirement
  S268M-2003 specifies that each line start is aligned on a 4-byte boundary.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/dpxenc.c

• dpx : use aligned line starts

  13 août 2014, par Christophe Gisquet

  dpx : use aligned line starts
  SMPTE 268M-2003 specifies that each line starts at a 4-bytes boundary.
  
  Therefore, modify correspondingly the input buffer strides and size.
  Partially fixes ticket #3692 : DLAD_8b_3c_big.dpx still has inverted
  
  colors, which might be related to endianness.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/dpx.c

• Video Frame Skipping Issues During Chunking and Uploading in React Native App

  24 février 2024, par Kishore J

  To create a social media platform like Instagram and Facebook, we have incorporated the functionality for users to upload reels-style videos. To enhance the viewing experience, we have implemented a strategy to segment these videos and upload them to the backend.

  


  To achieve this, we have employed the ffmpeg-kit-react-native and rn-fetch-blob libraries to segment videos efficiently. We've written an asynchronous function, chunkVideo, which chunks the input video file into segments of a specified duration. Here's a snippet of the code :

  


  async function chunkVideo(inputVideoFile, fileName, segmentDuration = 3) {
try {
  // Define the cache directory path
  const cacheDir = RNFetchBlob.fs.dirs.CacheDir;
  const outputTSFilePattern = `${cacheDir}/${fileName}_video%d.ts`;
  await FFmpegKit.execute(
   `-i ${inputVideoFile} -codec: copy -start_number 0 -hls_time ${segmentDuration} -hls_list_size 0 -hls_segment_filename ${outputTSFilePattern} -f hls ${cacheDir}/index.m3u8`,
  );
} catch (err) {
  logEvent("chunkVideoError", {error: err?.message});
  errorToast(err, true);
  }
}


  


  While this approach works well for segmenting videos, we encountered an issue where some frames are skipping during the chunking process, leading to a compromised viewing experience for the end-users.

  


  How to mitigate the frame skipping problems ?