Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• iPhone SDK - Converting .mov to .3gp

  15 novembre 2011, par Lucas Moreira

  I need to convert a video in format ".mov" to ".3gp". I searched on Google and I found some people saying to use ffmpeg.

  I search a lot but I don't found any tutorial to how compile ffmpeg for iPhone then convert the video.

  Has anyone what have done this or know any tutorial?

  Thanks a lot.

• AMV video encoder ?

  15 novembre 2011, par Shimmy

  I'm looking for a converter that can encode input files to amv format output.

  I've found this project, but it looks somewhat outdated and not maintained. Do you know of a solid and reliable amv encoder (any API or tool that can be invoked from .NET), or can you recommend on the one I mentioned?

• Error installing ffmpeg on Ubuntu 8.04 JeOS with Speex

  15 novembre 2011, par tubbo

  I'm having an issue installing ffmpeg with Speex support on Ubuntu 8.04 JeOS. After some wandering around in dependency hell I managed to secure the proper libspeex and ffmpeg versions, and it ./configured properly, but when I try to run make && make install, it fails with the following error:

  ffmpeg.c: In function ‘opt_recording_timestamp’:
  ffmpeg.c:3080: warning: dereferencing type-punned pointer will break strict-aliasing rules
  ffmpeg.c: In function ‘opt_input_file’:
  ffmpeg.c:3312: warning: ‘loop_input’ is deprecated (declared at libavformat/avformat.h:919)
  ffmpeg.c: In function ‘opt_output_file’:
  ffmpeg.c:4086: warning: ‘loop_output’ is deprecated (declared at libavformat/avformat.h:895)
  ffmpeg.c: In function ‘opt_map’:
  ffmpeg.c:2873: warning: ‘sync_stream_idx’ may be used uninitialized in this function
  CC  cmdutils.o
  LD  ffmpeg_g
  libavcodec/libavcodec.a(libspeexdec.o): In function `libspeex_decode_close':
  /home/tom/src/ffmpeg/libavcodec/libspeexdec.c:144: undefined reference to `speex_header_free'
  libavcodec/libavcodec.a(libspeexenc.o): In function `encode_init':
  /home/tom/src/ffmpeg/libavcodec/libspeexenc.c:224: undefined reference to `speex_header_free'
  /home/tom/src/ffmpeg/libavcodec/libspeexenc.c:215: undefined reference to `speex_header_free'
  collect2: ld returned 1 exit status
  make: *** [ffmpeg_g] Error 1
  

  I'm a complete noob to ffmpeg and speex, except for using the codec on Ventrilo back in the day. Can someone shed some light as to why this is happening?

• Flash Media Server Recording Delay

  14 novembre 2011, par Corey

  I have an application where a user can record themselves singing along to a song. Once I receive the NetStream status event 'Record.Start' I start playing an audio file. Once the audio completes, I stop recording. Next, I have a script that runs FFMPEG to combine the recorded video/audio with the same music file. The problem I'm finding is that there is a noticeable delay between the recorded audio and the music. It seems also that this delay depends on network speed as it varies depending on the network. Can I determine this delay through the FMS dynamically?

• Small pieces of video splitted by ffmpeg are not playing or playing with artifacts

  14 novembre 2011, par Rnd_d

  I'm trying to cut video file into small parts (0.5-5 secs) and encode these parts to h.264/aac with ffmepg. I'm using this cmd:

  ffmpeg -i 1.avi -ss 00:05:00 -t 00:00:01,50 -vcodec libx264 -threads 0 -vpre default -acodec libfaac out1.mp4

  in vlc, some pieces are plaing without video, sound only, other pieces had a video artifacts like this screenshot.

  Maybe i didn't use some necessary agruments for ffmpeg?