ffmpeg

Using FFMPEG and url_fopen example

So I wonder how to get a streal from URL (with url_fopen for ex) (live video or PCM stream for example) and encode it into somsh? ...

some help with ffmpeg and start time

Hi all, I have the following situation: I have a video file that I get from a live stream. Then I want to convert the file to a different bitrate using ffmpeg, but unfortunately ffmpeg resets the start time of the video, which breaks my application, since it needs to know the start time of each video (and these of course should be diffe...

encode video is reverse?

Hi, Does anyone know if it is possible to encode a video using ffmpeg in reverse? (So the resulting video plays in reverse?) I think I can by generating images for each frame (so a folder of images labelled 1.jpg, 2.jpg etc), then write a script to change the image names, and then re-encode the ivdeo from these files. Does anyone kno...

getting error while converting wav to amr using ffmpeg

hello friends I am using ffmpeg to convert amr to wav and wav to amr.Its successfully converting amr to wav but not viceversa. As ffmpeg is supporting amr encoder decoder, its giving error. ffmpeg -i testwav.wav audio.amr Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, widt...

What is 'System Usage Specification' ?

My software is a video-audio converter and video cutter. I have used Qt(compiled from source) and ffmpeg (compiled from source). I have to prepare System Usage Specification outline and Specify Usage patterns of the system and indicate it using Run charts / Histograms. I am told to use Winrunner for this purpose. I don't know exactly wha...

FFMPEG: How to convert 1000 jpegs and 100 mp3 seconds into video?

So my programm generates JPegs and MP3 stereo track. I want to convert my programm results with FFMPEG to h264+aac or OGG (vorbis+theora) 100 seconds video. So how to do It from commandline at least (or using pure ffmpeg lib from C)? ...

Adding assembly files for compilation/assembling to ffmpeg package

Hello, I have a ffmpeg v0.5 package, which i am working on Theora Decoder. I have optimized belo file in the package: vp3dsp.c by doing ARM Neon assembly hand-coding. I need to plugin this file in the whole ffmpeg package and build it. I checked the makefile. FFMPEG has different make files for creating different libraries for libavcode...

ffmpeg 0.5 flv to wav conversion creates wav files that other programs won't open.

Hi, I am using the following command to convert FLV files to audio files to feed into julian, a speech to text program. cat ./jon2.flv | ffmpeg -i - -vn -acodec pcm_s16le -ar 16000 -ac 1 -f wav - | cat - > jon2.wav The cat's are there for debugging purposes as the final use will be a running program that will pipe FLV into ffmpeg's ...

Generating random thumbnails with PHP+FFMPEG

I'm trying to generate thumbnails from random points in a movie using FFMPEG and FFMPEG-PHP extension. My script works OK.. however takes 20 minutes just to generate 5-10 thumbnails!! The script works by generating random numbers which are used as frame numbers later. All numbers generated are within the movies frame count. Can you w...

FFmpeg on iPhone getting error running 'make'

I'm getting an error when trying to make ffmpeg on my intel mac, iPhone SDK 3.1, using the same command lines that were used here, and using the latest checkout of ffmpeg from svn. Here's the error that I'm getting: CC libavcodec/apedec.o AS libavcodec/arm/dsputil_arm.o /bin/sh: /usr/local/bin/gas-preprocessor.pl: Permission denied ma...

FFMPEG based Theora Video Decoder performance??

Hi, I am in process of porting and optimization of the theora video decoder in the ffmpeg-0.5 package to ARM-Cortex-A8 -Neon processor @ 667 MHz. I am looking for some target estimate for frames per second the decoder library alone should achieve after full optimization (C level and Neon assembly / Intrinsics) for 720x480 Progressive co...

Problem with recording audio in Flash (Red5, ffmpeg)

I'm trying to implement a small program with Flash and php that records audio and converts it to mp3. Currently I have Red5 server up and running, I can connect to it with no problems and I can publish flv recordings to the server. When I listen to the flv with Wimpy FLV player it seems to be fine. The problem comes when I'm trying to c...

Trying to compile x264 and ffmpeg for iPhone - "missing required architecture arm in file"

I'm trying to compile x264 for use in an iPhone application. I see there are instructions on how to compile ffmpeg for use on the platform here: http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html , but I can't seem to find anything this complete for compiling x264 on the iPhone. I've found this source tree: http:...

x264 IDR access unit with a SPS and a PPS

Hi All, I am trying to encode video in h.264 that when split with Apples HTTP Live Streaming tools media file segmenter will pass the media file validator I am getting two errors on the split MPEG-TS file WARNING: Media segment contains a video track but does not contain any IDR access unit with a SPS and a PPS. WARNING: 7 samples (17....

flv from vlc to ffmpeg live video error when no sound temporarily

Hi When we get live stream from vlc to ffmpeg , wherever there is sometimes 5-6 second no sound part of video , then ffmpeg is dead with this log flv @ 0x8b426d0]illegal ac vlc code at 4x6 [flv @ 0x8b426d0]Error at MB: 142 [flv @ 0x8b426d0]concealing 257 DC, 257 AC, 257 MV errors [mpegts @ 0x8b44e50]dts < pcr, TS is invalid Is t...

ffmpeg C API documentation/tutorial

I am trying to find documentation to use the ffmpeg C API. It seems that only command line documentation is available. Is there any good documentation/tutorials/links available? ...

ffmpeg for a android (using tutorial: "ffmpeg and Android.mk")

Hi to all, I am trying to compile ffmpeg for a android. I have found several posts on this theme but non of these seems to work. If tried to build ffmpeg like it is posted on [1]. Did anybody successfully compile ffmpeg using theses tutorial? I am not sure how to realize step 4 to 5. STEP4: Configuring ... STEP5: cd to your ND...

How to I configure sox to work on mp4 ?

I am using ubuntu 8.10. I wanted to know what I need to do to get SOX to work on MP4 files. ...

How to read remote video on Amazon S3 using ffmpeg

I need to create poster frames from videos hosted on Amazon S3 via ffmpeg. So is there a way to use the remote video file directly in ffmpeg command line like this: ffmpeg -i "http://bucket.s3.amazonaws.com/video.mp4" -ss 00:00:10 -vframes 1 -f image2 "image%03d.jpg" ffmpeg just returns: http://bucket.s3.amazonaws.com/video.mp4: I/O e...

How to do live streaming from WebCamera using ffserver on Windows?

How to do live streaming from WebCamera using ffserver on Windows? I have windows. FFserver installed on it. Web Camera attached to it. How to do streaming of that web camera using FFserver? ...