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To encode a 24-hour YouTube playlist as one video, first assemble its source clips into a single file, then run FFmpeg twice with the same video settings: pass one analyzes the video and saves statistics; pass two uses them to produce the final encode at your target average bitrate. Two-pass encoding is useful when you care about bitrate or approximate file size, but YouTube does not require it. A YouTube playlist on the site is a collection of videos; this workflow creates one long video, not that collection.
Before you encode: prepare one complete input file
The commands below encode a single input file. They do not join playlist items, create a YouTube playlist, schedule publication, or establish that you have rights to the source material. Assemble the intended clips first, with consistent dimensions, frame rate, audio, and color handling. A 24-hour input must also fit your account’s applicable upload limits; the cited encoding guidance does not establish a universal account limit.
Inspect the assembled file before committing to a long encode. Check its duration, video and audio streams, dimensions, frame rate, whether it is interlaced, audio layout, and color characteristics. FFmpeg’s official documentation describes its options and available encoders; confirm that your installed build includes libx264 before using the example below. FFmpeg documentation · FFmpeg codec documentation
Choose a bitrate that matches the video
Two-pass bitrate encoding targets an average video bitrate. The first pass writes analysis statistics; the second distributes the target bitrate using those statistics. It is a practical choice when you need a deliberate bitrate and a more predictable output size. It is not a promise of a particular visual quality or exact file size.
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YouTube’s upload settings are recommendations, not mandatory limits. Choose by resolution, frame-rate class, and SDR or HDR; the values below are YouTube’s reference bitrates, not independent quality measurements. YouTube’s settings page accessed on 2026-10-03 also says to encode and upload at the recorded frame rate. YouTube recommended upload encoding settings
| Upload format | Standard frame-rate group | High frame-rate group |
|---|---|---|
| SDR 360p | 1 Mbps | 1.5 Mbps |
| SDR 480p | 2.5 Mbps | 4 Mbps |
| SDR 720p | 5 Mbps | 7.5 Mbps |
| SDR 1080p | 8 Mbps (24/25/30 fps) | 12 Mbps (48/50/60 fps) |
| SDR 1440p | 16 Mbps (24/25/30 fps) | 24 Mbps (48/50/60 fps) |
| SDR 2160p | 35–45 Mbps (24/25/30 fps) | 53–68 Mbps (48/50/60 fps) |
| HDR 1080p | 10 Mbps | 15 Mbps |
| HDR 1440p | 20 Mbps | 30 Mbps |
| HDR 2160p | 44–56 Mbps | 66–85 Mbps |
Use a target appropriate to the source rather than upscaling or inventing frame detail to reach a higher tier. For other SDR resolution tiers, YouTube lists the standard/high-frame-rate pairs shown above. Its stereo audio reference is 384 kbps; that is an audio bitrate, separate from the video target.
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At 8 Mbps, a 24-hour video payload alone works out to about 86.4 decimal GB: 8 megabits per second × 86,400 seconds ÷ 8 bits per byte. That is arithmetic from the bitrate and duration, not a guaranteed output size. Audio, container overhead, and any intermediate files increase storage needs; allow working space for the source, output, logs, and assembly files.
Run FFmpeg’s first and second passes
This illustrative Linux/macOS template uses H.264 via libx264, a target video bitrate of 8 Mbps, AAC audio, and a 48 kHz sample rate. The 8 Mbps video setting corresponds to YouTube’s SDR 1080p standard-frame-rate reference only; change it to the applicable target from the table if your intended resolution, frame rate, or HDR/SDR format differs. This command is a template, not a test against a particular input or FFmpeg build.
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- First pass — analyze video and write statistics:
ffmpeg -i input.mp4 -map 0:v:0 -c:v libx264 -preset medium -b:v 8M -pass 1 -passlogfile encode_stats -an -f null /dev/null - Second pass — create the output:
ffmpeg -i input.mp4 -map 0:v:0 -c:v libx264 -preset medium -b:v 8M -pass 2 -passlogfile encode_stats -map 0:a? -c:a aac -b:a 384k -ar 48000 -pix_fmt yuv420p -movflags +faststart output.mp4
On Windows, use NUL as the first-pass null device instead of /dev/null. Output muxer handling can vary, so check the installed FFmpeg version and encoder availability. Use a distinct pass-log prefix for each input or simultaneous job so the jobs do not overwrite one another.
Keep the input, selected video stream, encoder, target bitrate, and material video filters/options aligned between passes. If you scale, convert frame rate, deinterlace, or apply color handling, decide deliberately and use consistent video processing in both passes. The example re-encodes audio; if the source audio already meets the intended format, copying it or encoding it separately may be appropriate.
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Use settings that suit YouTube and your source
YouTube’s guidance for uploads recommends MP4, H.264 video, progressive scan, High Profile, two consecutive B frames, a closed GOP with a GOP duration of half the frame rate, CABAC, variable bitrate, and 4:2:0 chroma. For audio it lists AAC-LC, Opus, or Eclipsa Audio at 48 kHz, with stereo, stereo plus 5.1, or stereo plus Eclipsa channel combinations. These are recommendations, not requirements for every file. The example uses AAC and 4:2:0 pixel format, but does not force every listed codec option or channel configuration.
Do not force an output frame rate without a reason: YouTube says, “Content should be encoded and uploaded in the same frame rate it was recorded.” For interlaced material, YouTube recommends deinterlacing. For color, it recommends BT.709 for SDR; preserve or correctly signal the source’s color characteristics rather than applying universal color tags when the source is unknown. Mismatched or unspecified metadata can affect how color is interpreted or converted.
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Know when two-pass is—and is not—the right choice
- Choose two-pass bitrate encoding when a target average bitrate or approximate output size matters. It performs a complete analysis pass before creating the output, so it requires additional processing time and disk space for logs.
- Consider quality-based rate control instead when you prioritize a quality target over a set average bitrate or predictable size. CRF is a constant-quality mode, unlike the bitrate-targeted example; do not casually combine
-crfwith this two-pass template. - Consider an available hardware encoder only if your FFmpeg build supports it and its output suits your quality and compatibility needs. The example uses software
libx264; no universal speed advantage or quality outcome can be assumed without testing your own source and machine.
No completion-time estimate is reliable without a representative test on your hardware and content. A 24-hour source may take a substantial amount of processing and requires enough working storage and upload capacity.
Troubleshoot common problems
- “Unknown encoder ‘libx264’”: Your FFmpeg build may not include the encoder. Check available encoders and use a build that supports
libx264, or select an encoder actually available in your build. - Pass two cannot find statistics or behaves like a fresh encode: Confirm pass one completed, both commands use the same
-passlogfileprefix, and the log files remain available in the working directory. Keep each job’s prefix unique. - Unexpected duration, missing picture, or missing audio: Verify the assembled input and stream mapping. The example selects the first video stream (
0:v:0) and maps audio streams optionally (0:a?); files with unusual stream layouts may need explicit mapping. - Output is much larger or smaller than expected: Recheck the video bitrate and duration, then account for audio, container overhead, and other streams. Bitrate arithmetic estimates payload, not an exact final file size.
- Color or motion looks wrong: Check source frame rate, interlacing, and color metadata. Avoid arbitrary frame-rate conversion or color tagging; handle filtering consistently across passes.
- Upload is rejected or processing differs from expectations: Check YouTube’s current upload guidance, account-specific limits, file format, and audio/video encoding. The recommendations cited here do not establish the maximum duration permitted for your account.
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