<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Hi Kaarlo,</span></div><div><br><span></span></div><div><span>Thank you very much for your help.</span></div><div><br><span></span></div><div><span>Is there a way to batch-extract the metadata from mp4 using vlc?</span></div><div><br></div><div>Also, is there a way to batch-extract raw AAC and H.264 streams (without transcoding) into their respective files?<br></div><div><br><span></span></div><div><span>Regards,</span></div><div><span>Peter</span></div><div><br></div><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><font face="Arial" size="2"><hr size="1"><b><span style="font-weight:bold;">From:</span></b> Kaarlo Räihä <kaarlo.raiha@gmail.com><br><b><span style="font-weight:
bold;">To:</span></b> Mailing list for VLC media player developers <vlc-devel@videolan.org><br><b><span style="font-weight: bold;">Sent:</span></b> Tuesday, August 23, 2011 11:06 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [vlc-devel] A simple container format<br></font><br><meta http-equiv="x-dns-prefetch-control" content="off"><div id="yiv407594293">2011/8/23 Peter Tap <span dir="ltr"><<a rel="nofollow" ymailto="mailto:ptrtap@yahoo.com" target="_blank" href="mailto:ptrtap@yahoo.com">ptrtap@yahoo.com</a>></span><br><div class="yiv407594293gmail_quote"><blockquote class="yiv407594293gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:12pt;"><div>Folks,</div><div><br></div><div>For my project, I need to build a custom container as a proof of concept. The container will have just one H.264 video stream and one AAC audio stream. I will write a vlc demux to deal with this container file.<br>
</div><div><br></div><div>To keep things simple, the container format I am thinking is:</div><div>1. First 8 bytes contain the location for the start of audio stream.</div><div>2. Video stream follows.</div><div>3. Audio stream follows.<br>
</div>
<div><br></div><div>I have a sample .mp4 file. I will strip video and audio data from this
mp4 file and create my container. Let's call it sample.my4. I will wire ".my4" extension into vlc.<br></div><div><br></div><div>I don't know much about the internals of x264 or AAC, and I am hoping I don't need to. However, I am not sure if stripping just audio and video streams are enough. Do I need to strip any other metadata from the original mp4 file? I guess for now it is okay if the user cannot do random seek.<br>
</div></div></div></blockquote><div><br></div><div>Resolution, FPS, aspect ratio, duration etc. might be something you want to keep in container. </div><div> </div><blockquote class="yiv407594293gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:12pt;"><div></div><div><br></div><div>Thank you in advance for your help.</div><div><br></div><div>Regards,</div>
<div>Peter<br></div><div><br></div><br></div></div><br>_______________________________________________<br>
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