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• GStreamer x264enc and SIGSEGV on Android

  18 juillet 2012, par Cipi

  I am trying to play around with GStreamer-java and it's h.264 encoder (x264enc) on Android.

  Now, I tried to encode raw video from test video source (set its is-live property to TRUE), and when data starts flowing into the x264enc Element, I get SIGSEGV in libx264.so and my app crashes. And it looks like code is dereferencing a NULL... Exact error location is in file "gstreamer_ndk_bundle/x264/encoder/analyse.c" line 963. And it is this line :

  h->mc.memcpy_aligned( h->mb.pic.i8x8_dct_buf, h->dct.luma8x8, sizeof(h->mb.pic.i8x8_dct_buf) );

  My device's CPU is Cortex 8 and it has NEON feature...

  I tried to printout to a file all h structure fields, and no field is uninitialized.

  Android DEBUG info from LogCat : HERE

  My questions :

  1. How can I know what is throwing SIGSEGV, because this line of code seems to be ok ?
  2. Is this a known bug or an expected behavior of x264 encoder on ARM CPU or I am missing some encoder configuration ?
  3. I noticed that if I set property analyse of the encoder to 0x3:0x113 (some random value I found online) I don't get SIGSEGV, encoder seems to work, but I get error in pipeline : Data flow error. Can I just set analyse to a meaningful value ?

  Update

  I fprintf-ed all important "h" fields just before execution runs in x264_mb_analyse_intra() function and just before the line that it breaks, guess it could help : http://pastebin.com/sAfX239j

• GStreamer x264enc and SIGSEGV on Android

  18 juillet 2012, par Cipi

  I am trying to play around with GStreamer-java and it's h.264 encoder (x264enc) on Android.

  Now, I tried to encode raw video from test video source (set its is-live property to TRUE), and when data starts flowing into the x264enc Element, I get SIGSEGV in libx264.so and my app crashes. And it looks like code is dereferencing a NULL... Exact error location is in file "gstreamer_ndk_bundle/x264/encoder/analyse.c" line 963. And it is this line :

  h->mc.memcpy_aligned( h->mb.pic.i8x8_dct_buf, h->dct.luma8x8, sizeof(h->mb.pic.i8x8_dct_buf) );

  My device's CPU is Cortex 8 and it has NEON feature...

  I tried to printout to a file all h structure fields, and no field is uninitialized.

  Android DEBUG info from LogCat : HERE

  My questions :

  1. How can I know what is throwing SIGSEGV, because this line of code seems to be ok ?
  2. Is this a known bug or an expected behavior of x264 encoder on ARM CPU or I am missing some encoder configuration ?
  3. I noticed that if I set property analyse of the encoder to 0x3:0x113 (some random value I found online) I don't get SIGSEGV, encoder seems to work, but I get error in pipeline : Data flow error. Can I just set analyse to a meaningful value ?

  Update

  I fprintf-ed all important "h" fields just before execution runs in x264_mb_analyse_intra() function and just before the line that it breaks, guess it could help : http://pastebin.com/sAfX239j

• How to combine a .mp4 video with a .wav audio with an offset in ffmpeg from command line ?

  15 mars 2014, par minder42

  I've got a TV clip in mp4 format containing audio and video, and an WAV audio_commentary track.

  I've been trying to combine them in ffmpeg and then play it online with a flash player (which can only take h264 format)

  What's the best ffmpeg command to accomplish this ? My inputs are MP4 video, WAV audio, and an offset in seconds, the time the audio commentary starts relative to the start of the mp4 video.

  I tried

  ffmpeg -i input_audio.wav -i input_vid.mp4 -vcodec copy output.mp4

  and

  ffmpeg -vcodec copy -ss offset -i input_audio.wav -i input_video.mp4 output.mp4

  nether of these do what I want and output the video in the h264 format that is good for flash players- Is there a way to do this from command line in ffmpeg ?