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• Is it possible to concatenate few videos together, setting their timings and displaying background image, if no video for the current frame ?

  13 juillet 2020, par Valeryi Cherdakov

  I have an audio track, say, a few minutes long, as well as several short videos of several tens of seconds. For each of these videos I have a timing - the video should start at a certain second. The audio tracks of these videos are not needed.
The output video should last exactly as long as the audio lasts.
If at the moment there is no video to display, a picture should be displayed (as if the picture is on layer #1, and the rest of the videos are on layer #2).

  


  Is it possible to complete this task using a command or a series of ffmpeg commands ?

  


• lavfi/dnn : Remove DNN native backend

  27 avril 2023, par Ting Fu

  lavfi/dnn : Remove DNN native backend
  According to discussion in
  
  https://etherpad.mit.edu/p/FF_dev_meeting_20221202 and the proposal in
  
  http://ffmpeg.org/pipermail/ffmpeg-devel/2022-December/304534.html,
  
  the DNN native backend should be removed at first step.
  
  All the DNN native backend related codes are deleted.
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] libavfilter/Makefile
  • [DH] libavfilter/dnn/Makefile
  • [DH] libavfilter/dnn/dnn_backend_native.c
  • [DH] libavfilter/dnn/dnn_backend_native.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_avgpool.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_avgpool.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_conv2d.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_conv2d.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_dense.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_dense.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_depth2space.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_depth2space.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_mathbinary.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_mathbinary.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_mathunary.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_mathunary.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_maximum.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_maximum.h
  • [DH] libavfilter/dnn/dnn_backend_native_layer_pad.c
  • [DH] libavfilter/dnn/dnn_backend_native_layer_pad.h
  • [DH] libavfilter/dnn/dnn_backend_native_layers.c
  • [DH] libavfilter/dnn/dnn_backend_native_layers.h
  • [DH] libavfilter/dnn/dnn_backend_tf.c
  • [DH] libavfilter/dnn_interface.h
  • [DH] libavfilter/tests/dnn-layer-avgpool.c
  • [DH] libavfilter/tests/dnn-layer-conv2d.c
  • [DH] libavfilter/tests/dnn-layer-dense.c
  • [DH] libavfilter/tests/dnn-layer-depth2space.c
  • [DH] libavfilter/tests/dnn-layer-mathbinary.c
  • [DH] libavfilter/tests/dnn-layer-mathunary.c
  • [DH] libavfilter/tests/dnn-layer-maximum.c
  • [DH] libavfilter/tests/dnn-layer-pad.c
  • [DH] libavfilter/vf_derain.c
  • [DH] libavfilter/vf_dnn_processing.c
  • [DH] libavfilter/vf_sr.c
  • [DH] tests/Makefile
  • [DH] tests/fate/dnn.mak

• ffmpeg : how to extract 1st video, english audio and french subtitle from video file in one command line ?

  15 mai 2020, par Sxilderik

  I have read many posts related to extracting streams per language with ffmpeg, but it seems that the -map 0:m:language:xxx is global, and goes for all streams.

  



  Let’s say I have a video file that contains hopefully one english audio stream and some french subtitle streams, among possibly many other streams. I want to get a smaller file with the first video track, the (first) english audio stream and all the french subtitle streams.

  



  If I run

  



  ffmpeg -i "$file" -map 0:v:0 -vcodec copy -map 0:m:language:eng -acodec copy -map 0:m:language:fre -scodec copy -f matroska "${file%.*}.mkv_out"


  



  I get in file.mkv_out all audio and subtitle tracks which are either french or english.

  



  Is there a way to achieve this, without having any prior knowledge of track numbers in the original file ?

  



  Thanks.