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• ffmpeg Could not find input stream [closed]

  17 avril 2013, par Peter Walker

  I've seen lot's of post on streaming video feeds to ffserver but still haven't found what I wanted.

  I use not only on the mp4 file but avi and other formats as well.

      ffmpeg -i test5.mp4 http://localhost:8090/feed1.ffm

  I keep finding this error.

      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test5.mp4':
  
      Metadata:
  
             major_brand     : isom
  
             minor_version   : 512
  
             compatible_brands: isomiso2mp41
  
             encoder         : Lavf53.21.1
  
      Duration: 00:05:00.00, start: 0.000000, bitrate: 278 kb/s
  
      Stream #0.0(und): Video: mpeg4 (Simple Profile), yuv420p, 640x320 [PAR 1:1 DAR     2:1], 277 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Incompatible sample format '(null)' for codec 'mp2', auto-selecting format 's16'
  
      Last message repeated 1 times
  
      Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
  
      Stream #0.0: Video: [0][0][0][0] / 0x0000, yuv420p, q=0-0, 1000k tbn
  
      Stream #0.1: Video: mpeg1video, (null), 32622x226393720, q=2-31, pass 1, pass 2,     226393 kb/s, 1000k tbn
  
      Stream #0.2: Audio: mp2, 22050 Hz, 1 channels, s16, 226391 kb/s
  
      Stream #0.3: Video: msmpeg4, yuv420p, 352x240, q=2-31, 226391 kb/s, 1000k tbn, 15  tbc
  
      Could not find input stream matching output stream #0.2
  
      *** glibc detected *** ffmpeg: free(): invalid pointer: 0x0000000000a53d00 ***
  
      ======= Backtrace: =========
  
      /lib/x86_64-linux-gnu/libc.so.6(+0x7e626)[0x7f6e0d4af626]
  
      /usr/lib/x86_64-linux-gnu/libavformat.so.53(avformat_free_context+0xb0)    [0x7f6e0f2c9c70]
  
      ffmpeg[0x4089bf]
  
      ffmpeg[0x40a52f]
  
      ffmpeg[0x407a04]
  
      /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f6e0d45276d]

  The config file I used for the ffserver is

      Port 8090
  
      RTSPPort 7654
  
      BindAddress 0.0.0.0
  
      MaxHTTPConnections 2000
  
      MaxClients 1000
  
      MaxBandwidth 500000
  
      CustomLog -
  
      NoDaemon
  
      <feed>
  
              File /tmp/feed1.ffm
  
              FileMaxSize 5M
  
      #       NoAudio
  
      </feed>
  
  
  
      <stream>
  
              Feed feed1.ffm
  
              Format rtp
  
      #       NoAudio
  
              VideoFrameRate 30
  
      </stream>

  Can anyone help me figure out some something or something to look for ?
  I tried googling but almost everyone uses video feeds instead or it just works well for them.
  Any clue or direction/suggestion would help. Thank you so much in advance.

• Record Audio From USB device using FFmpeg [migrated]

  6 janvier 2014, par Tony Springs

  I am trying to record an MP3 file from an audio device connected to the USB port using ffmpeg.

  I am on a Windows 7 machine, and I am trying to do this from a command line :

  ffmpeg -f alsa -i hw:0 -ac 2 -ar 44100 output.MP3

  I get an error message unknown input format 'alsa'.

  Do I need alsa ?

  What would be the command line for ffmpeg in Windows 7 to record audio from a USB device ?

• avcodec_find_encoder(AV_CODEC_ID_H264) returns null

  28 février 2017, par Monjura Rumi

  I am building an android application which will encode image captured from camera preview and later decode it. I am using ffmpeg library to encode and decode. To build static library with x264 I have used this tutorial. http://dl.dropbox.com/u/22605641/ffmpeg_android/main.html. As a source code of ffmpeg if I use the one downloaded from the link given in tutorial I can built it but can’t build library if i use source code downloaded from here git clone git ://source.ffmpeg.org/ffmpeg.git ffmpeg. I have built library in ubuntu and using it in windows 7 in Eclipse. As I need only h264 encoder and decoder I have used following code for ffmpeg, slightly modified from tutorial.

  #!/bin/bash
  
  
  
  NDK=~/Documents/android-ndk-r8e
  
  PLATFORM=$NDK/platforms/android-8/arch-arm
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  PREFIX=/home/android-ffmpeg
  
  
  
  function build_one
  
  {
  
      ./configure --target-os=linux --prefix=$PREFIX \
  
      --enable-cross-compile \
  
      --enable-runtime-cpudetect \
  
      --disable-asm \
  
      --arch=arm \
  
      --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
      --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
      --disable-stripping \
  
      --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
      --sysroot=$PLATFORM \
  
      --enable-nonfree \
  
      --enable-version3 \
  
      --disable-everything \
  
      --enable-gpl \
  
      --disable-doc \
  
      --enable-avresample \
  
      --disable-ffplay \
  
      --disable-ffserver \
  
      --enable-ffmpeg \
  
      --disable-ffprobe \
  
      --enable-avcodec \
  
      --enable-libx264 \
  
      --enable-encoder=libx264 \
  
      --enable-encoder=libx264rgb \
  
      --enable-decoder=h263 \
  
      --enable-decoder=h264 \
  
      --enable-decoder=svq3 \   
  
      --enable-zlib \
  
      --enable-gpl \
  
      --enable-pic \
  
      --disable-devices \
  
      --disable-avdevice \
  
      --extra-cflags="-I/home/android-ffmpeg/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a" \
  
      --extra-ldflags="-L/home/android-ffmpeg/lib"
  
  make -j4 install
  
  $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavfilter/libavfilter.a libavresample/libavresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lx264 --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
  
  }
  
  
  
  build_one

  After building library I have been able to build android ndk. A little part of my JNI code is here.

  JNIEXPORT jint JNICALL Java_com_example_testjava_TestjniActivity_initencoder(JNIEnv* env,jobject obj){
  
  
  
      av_register_all();
  
      avcodec_register_all();
  
      codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
      if (!codec) {
  
        __android_log_write(ANDROID_LOG_INFO, "debug", "not found");                
  
         return -1;
  
      }
  
  .
  
  .
  
  .
  
  }

  When I run my java source code that calls initencoder() I get -1 as return value and logcat prints "not found". That means avcodec_find_encoder() returns null and if condition is being ok. I don’t know what’s wrong. Why this function is returning null ? I have searched a lot but did not find any solution that could guide me to right direction. some says to use avcodec_init(). But ndk-build command fails and shows error saying undefined reference to ’avcodec_init()’. I have started with library build because I thought may be I am doing wrong from the first stage. Did I make any mistake in library building like not enabling things that I should ? Please help me here. This is kind of urgent for me.