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• Concatenating/Splicing overlapping video clips with ffmpeg

  16 décembre 2020, par Jimbo1987

  I'm trying to concatenate multiple short .mp4 video clips from a security camera. The camera records short clips, with a few seconds on either end of a timespan when motion is detected. For example, two minutes of video will often be broken up into four 35 second clips, with the first/last few seconds of each clip being duplicative of the last/first few seconds of the previous/next clip.

  


  I simply concatenate the clips together using the ffmpeg concat demuxer, as described here : How to concatenate two MP4 files using FFmpeg ?, with

  


  (echo file 'first file.mp4' & echo file 'second file.mp4' )>list.txt
ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4


  


  Or else I transcode them into intermediate MPEG-2 transport streams, which I can then concatenate with the file-level concat protocol, as described here : https://trac.ffmpeg.org/wiki/Concatenate#protocol, with

  


  ffmpeg -i "first file.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "second file.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output.mp4


  


  But either way, the resulting video (output.mp4) jumps backward in time a few seconds every half-minute or so because of the duplicated frames.

  


  I want to throw out the duplicate frames, and tie the clips together based on timestamps to achieve smooth playback of the concatenated full-length video. I'd strongly prefer to do this on Windows with ffmpeg if possible. Surely this has been done before, right ? Are there timestamps in the .mp4 files that I can use to determine how much overlap there is, and then splice at the proper point-in-time ? And if so, how do I read them, how do I splice at an exact point in time, and how do I get around the KeyFrames issue if I can splice at the exact point in time ?

  


• when use idb and ffmepg to record video, Appium Session lose

  6 septembre 2023, par azhi

  When use Appium to start the session and open app in iOS, connection will lost after using idb and ffmepg command to record video in java process. At the same time, Xcode will occur connection lost issue. If i open WDA again by manual in iPhone, tests again and connection will be normal. I tied switching port for WDA, unluckily it's the same result. Have any ideas for this, graceful for advice.

  


  test normal when use this way to record video.

  


  Appium log :

  
[Xcode] xcodebuild exited with code '65' and signal 'null' [HTTP] —> GET /session/f70eef73-ef99-4341-822f-d285d74a8614/timeouts [HTTP] {} [debug] [AppiumDriver@8f28] Encountered internal error running command : NoSuchDriverError : A session is either terminated or not started [debug] [AppiumDriver@8f28] at asyncHandler (/opt/homebrew/lib/node_modules/appium/node_modules/@appium/base-driver/lib/protocol/protocol.js:315:15) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/@appium/base-driver/lib/protocol/protocol.js:518:15 [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at next (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/route.js:144:13) [debug] [AppiumDriver@8f28] at Route.dispatch (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/route.js:114:3) [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:284:15 [debug] [AppiumDriver@8f28] at param (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:365:14) [debug] [AppiumDriver@8f28] at param (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:376:14) [debug] [AppiumDriver@8f28] at Function.process_params (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:421:3) [debug] [AppiumDriver@8f28] at next (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:280:10) [debug] [AppiumDriver@8f28] at logger (/opt/homebrew/lib/node_modules/appium/node_modules/morgan/index.js:144:5) [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at trim_prefix (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:328:13) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:286:9 [debug] [AppiumDriver@8f28] at Function.process_params (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:346:12) [debug] [AppiumDriver@8f28] at next (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:280:10) [debug] [AppiumDriver@8f28] at jsonParser (/opt/homebrew/lib/node_modules/appium/node_modules/body-parser/lib/types/json.js:113:7) [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at trim_prefix (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:328:13) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:286:9 [debug] [AppiumDriver@8f28] at Function.process_params (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:346:12) [HTTP] GET /session/66e1fdca-4e8c-418e-a0d1-6d98779b874c/screenshot


• ffmpeg on android — cannot write output file

  13 février 2015, par user3708803

  I’m trying to use ffmpeg as a shared library in Android to convert PCM to an .mp4 file. Before going further, I hit a snag in my openOutputFile function, I have the following which has given me an error (passing in "/sdcard/a.mp4" for filename) :

  if ((error = avio_open(&output_io_context, filename,
  
                         AVIO_FLAG_WRITE)) < 0) {
  
      __android_log_print(ANDROID_LOG_ERROR, "encoder","couldn't open output file");
  
      exit(1);
  
  }

  My configure for ffmpeg compilation is as follows :

  ./configure \
  
  --prefix=$PREFIX \
  
  --enable-demuxer=mov \
  
  --enable-muxer=mov \
  
  --enable-libvpx \
  
  --enable-libvorbis \
  
  --enable-protocol=file \
  
  --enable-shared \
  
  --disable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-symver \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  --extra-ldflags="$ADDI_LDFLAGS" \

  when searching, I have come across others’ experiencing similar issues and added the —enable-protocol=file and —enable-muxer=mov when compiling ffmpeg. I did add the permissions to external storage in the manifest.xml file. Please let me know what you think. Thanks.